# ChartandKeel > An open-access maritime engineering reference covering ship stability, metacentric height (GM), free surface effect, hull construction, diesel engines, auxiliary machinery, marine electrical systems, and safety conventions (SOLAS, STCW, MARPOL). ## Overview ChartandKeel is an authoritative, open-access technical reference for maritime engineers, cadets, and naval architects preparing for MEO Class 4/2 oral and written examinations under IMO/STCW frameworks. ## Modules - [Ship Construction & Naval Architecture](https://chartandkeel.com/ship-construction): Fundamental principles of ship design, equilibrium, static and dynamic stability, stresses, and structural integrity. - [Safety](https://chartandkeel.com/safety): Maritime safety and pollution-prevention conventions — SOLAS, STCW and MARPOL — covering certificates, records, emergency procedures and Port State Control readiness. - [Marine Propulsion & Diesel Engines](https://chartandkeel.com/marine-diesel-engines): MEO Class 4 Motor — theoretical cycles, two-stroke and four-stroke construction, fuel injection, turbocharging, indicator diagrams, engine operation and troubleshooting. - [Auxiliary Machinery & Shipboard Systems](https://chartandkeel.com/auxiliary-machinery): MEO Class 4 MEP — shaft seals, heat exchangers, air compressors, pumps, steering gear, refrigeration, purifiers, pipelines, valves, FWG, engine maintenance and watchkeeping. - [Marine Electrical Systems](https://chartandkeel.com/electrical): Function 5 quick-reference — switchboards and protection, motors and starters, transformers and electronics, alternators and parallel running, batteries, instruments and safety systems. - [3D Interactive Lab](https://chartandkeel.com/3d-lab): Interactive 3D spatial models of ship construction elements (chain locker, forepeak, double bottom, watertight doors, keels, and propulsion shafts). ## Interactive 3D Models - [Fore Peak Structural Skeleton 3D](https://chartandkeel.com/3d-lab/forepeak): Interactive 3D view of the fore peak: shell, collision bulkhead, panting stringers, breast hooks. Run panting & pounding load simulations in your browser. - [Keel, Duct Keel & Bilge Keel 3D](https://chartandkeel.com/3d-lab/keel): Interactive 3D view of ship keels: flat plate, bar, duct keel with pipe rack, bilge keel fin and sacrificial ground bar. Orbit and isolate every part. - [Hatch Covers, Coaming & Weathertight Sealing 3D](https://chartandkeel.com/3d-lab/hatch): Interactive 3D view of hatch covers: coaming, gasket, compression bar, cleats and hydraulics. Play the full weathertight opening cycle in 3D. - [Double Bottom, Floors & Deep Tank 3D](https://chartandkeel.com/3d-lab/doublebottom): Interactive 3D view of the double bottom: plate floors, girders, longitudinals and deep tank structure. Compare floor types in 3D. - [Watertight Doors & Their Mechanisms 3D](https://chartandkeel.com/3d-lab/wtd): Interactive 3D view of watertight doors: hinged, manual sliding, power sliding and vertical sliding types with gears, wedges and SOLAS tests. - [Shaft Tunnel, Ring Stiffeners & Line Shaft Bearings 3D](https://chartandkeel.com/3d-lab/shafttunnel): Interactive 3D view of the shaft tunnel: watertight plating, ring stiffeners, removable side plate, line shaft bearings and escape routes. - [Torsion Box, Racking & Hull Twisting 3D](https://chartandkeel.com/3d-lab/torsionbox): Interactive 3D view of the torsion box: box girders, closed cells, bulkheads. Watch hull twisting and racking simulations on open-deck ships. - [Fin, Bilge Keel & Tank Stabilisers 3D](https://chartandkeel.com/3d-lab/roll): Interactive 3D view of roll reduction: active fins, bilge keels, passive and active stabiliser tanks. Run each stabilising system in 3D. - [Propeller Fitting: Taper, Key & Locking 3D](https://chartandkeel.com/3d-lab/propfitting): Interactive 3D view of propeller fitting: taper, key, boss, locking and keeper nuts, cotter pin. Follow the dry-fit, lapping and lock-up sequence. - [Shore, Bilge & Sewage Couplings 3D](https://chartandkeel.com/3d-lab/couplings): Interactive 3D view of international shore, bilge and sewage couplings with exact flange dimensions, gaskets, bolts and bolt-up sequence. - [Principal Dimensions & Hull Form 3D](https://chartandkeel.com/3d-lab/shipdimensions): Interactive 3D view of principal ship dimensions: LOA, LBP, LWL, depth, draught, freeboard, breadth, sheer and camber on a 3D hull. - [Chain Locker, Bitter End & Cable Arrangement 3D](https://chartandkeel.com/3d-lab/chainlocker): Interactive 3D view of the chain locker: anchor, hawse pipe, stopper, windlass gypsy, spurling pipe, locker and bitter-end quick release. Free in browser. - [Bow Thruster: Tunnel, Impeller & Drive 3D](https://chartandkeel.com/3d-lab/bowthruster): Interactive 3D view of the bow thruster: transverse tunnel, impeller, CPP hub, vertical drive and motor. Reverse thrust and watch cavitation in 3D. - [Propeller Shaft: Bearings, Seals & Drop 3D](https://chartandkeel.com/3d-lab/shaftbearings): Interactive 3D view of the propeller shaft line: couplings, bearings, seals and propeller drop. Run bolting, lubrication and seal-wear sequences. - [Cruiser & Transom Stern, Cant Frames & Frame Spacing 3D](https://chartandkeel.com/3d-lab/stern): Interactive 3D view comparing cruiser and transom sterns: cant frames, spacing rules, beams, floors and slamming load simulation. - [Anti-Heeling Tanks, Pump & Pneumatic Transfer 3D](https://chartandkeel.com/3d-lab/antiheeling): Interactive 3D view of the anti-heeling system: tanks, reversible pump, remote valves, pneumatic transfer, heel sensor and safety switches. - [Rudder Construction & Carrier Bearing 3D](https://chartandkeel.com/3d-lab/ruddercarrier): Interactive 3D view of rudder construction: balanced, semi-balanced and Becker flap rudders, conical carrier thrust ring, trunk, gland and transom space. ## Topics & Lessons by Module ### Ship Construction & Naval Architecture - [Ship Stability & Metacentric Height (GM)](https://chartandkeel.com/topics/ship-stability-metacentric-height-gm): A foundational marine guide explaining how floating vessels stay upright, how the triad of G, B, and M governs balance, and how metacentric height dictates seaworthiness. - [Free Surface Effect (FSE) & Angle of Loll](https://chartandkeel.com/topics/free-surface-effect-angle-of-loll): A critical marine engineering and seamanship guide explaining fluid inertia in partially filled tanks, the math of longitudinal bulkheads, and the life-saving procedure for correcting a lolled ship. - [Bulbous Bow & Wave Cancellation Physics](https://chartandkeel.com/topics/bulbous-bow-wave-cancellation-propulsion): A visual hydrodynamic guide explaining why modern cargo ships feature a protruding bulb at their stem, the physics of destructive wave interference, and the operational trade-offs of vessel draft and speed. - [Dynamic Hull Stresses: Panting & Pounding](https://chartandkeel.com/topics/hull-stresses-panting-pounding): A clear structural engineering guide detailing the extreme cyclic loads experienced at ship ends, the bellows-like "panting" of bow shell plating, bottom "pounding" shockwaves, and the internal steel skeleton built to resist them. - [Ship Keels & Bilge Keel Construction](https://chartandkeel.com/topics/keel-types-duct-bilge-keel): A comprehensive naval architecture guide explaining the centerline backbone of ships, the anatomy and drydock requirements of duct keels, and the hydrodynamic engineering behind roll-damping bilge keels. - [Watertight Bulkheads & The Collision Bulkhead](https://chartandkeel.com/topics/watertight-bulkheads-collision-corrugated): A critical ship construction guide detailing the regulatory positioning of collision bulkheads, the four mandatory watertight bulkheads, corrugated bulkhead geometry, and classification testing protocols. - [Hatch Covers, Coamings & Weathertight Sealing](https://chartandkeel.com/topics/hatch-covers-coamings-weathertight-testing): A complete technical breakdown of cargo hold hatch covers and coamings under the International Load Line Convention. Details coaming structural stays, knife-edge compression bar mechanics, neoprene gaskets, resting pads, folding/single-pull/side-rolling kinematics, and classification hose vs. ultrasonic testing. - [Double Bottom Construction & Deep Tanks](https://chartandkeel.com/topics/double-bottom-construction-deep-tanks): An in-depth naval architecture analysis of ship double bottom construction and deep tanks under classification society rules. Covers continuous center girders, intercostal side girders, solid plate floors with drainage limbers, open bracket floors, longitudinal framing mechanics, and deep tank hydrostatic head pressure testing. - [Watertight Doors: Types, Mechanics & SOLAS Regulations](https://chartandkeel.com/topics/watertight-doors-types-solas-regulations): A complete maritime engineering reference on ship watertight doors (WTDs) under SOLAS Chapter II-1. Details the three regulatory classes, horizontal electro-hydraulic and vertical screw-spindle sliding mechanisms, de-wedging safety cams, bridge remote consoles, and watertight versus weathertight hydrostatic pressure testing. - [Rudder Construction & The Rudder Carrier Bearing](https://chartandkeel.com/topics/rudder-carrier-bearing-rudder-construction): A definitive marine engineering working guide on ship rudders, steering trunks, and rudder carrier bearings. Covers hydrodynamic balanced vs. semi-balanced geometry, conical thrust bearing mechanics, grease lubrication, rudder trunk watertight glands, and surveyor wear-down measurement using the trammel gauge. - [Shaft Tunnel Construction & Line Shaft Bearings](https://chartandkeel.com/topics/shaft-tunnel-construction-shaft-bearings): A definitive marine engineering working guide on the shaft tunnel. Covers the general arrangement when machinery is separated from the after peak by cargo holds, off-centre passage layout, watertight ring stiffener and plating scantlings, the removable side plate for shaft withdrawal, pipe-tunnel services, walking platforms, and shaft bearing stools that transmit load to the double bottom. - [Methods of Reducing Rolling: Fin, Bilge & Tank Stabilisers](https://chartandkeel.com/topics/roll-reduction-methods-fin-bilge-tank-stabilisers): A definitive marine engineering working guide on roll reduction. Covers active fin stabilisers with articulated tail flaps and their electro-hydraulic tilting gear, bilge keels and boundary-layer penetration depth, and the three free-surface tank systems (passive, controlled passive, and active controlled) including the critical tuning of tank water to the ship roll period. - [Torsion Box, Racking & Hull Twisting](https://chartandkeel.com/topics/torsion-box-racking-hull-twisting): A definitive marine engineering working guide on hull torsion and racking. Covers the twisting moment imposed on a ship heading obliquely to a wave, the location and construction of the topside torsion box girder including the upper deck, the picture-frame racking effect and its resistance by transverse bulkheads, and why oil tankers and bulk carriers require no torsion box. - [Standard Fire Test & Class A / B / C Divisions (Thermal Bulkheads)](https://chartandkeel.com/topics/standard-fire-test-class-a-b-c-divisions): A definitive marine engineering working guide on the standard fire test and fire class divisions. Covers the furnace test method and specimen size, the standard time-temperature curve, Class A (A-60/30/15/0), Class B (B-15/B-0) and Class C divisions, temperature-rise criteria, and key definitions of non-combustible material and flashpoint. - [Anti-Heeling System: Operation, Types & Safety](https://chartandkeel.com/topics/anti-heeling-system-operation): A definitive marine engineering working guide on the anti-heeling system. Covers the definition and causes of heeling, automatic heel-angle sensing and ballast transfer, the pneumatic and water pump system types, level-control safeguards, and the operational advantages for rapid cargo work in port. - [Enclosed Space Entry: Safe Procedure & Permit to Work](https://chartandkeel.com/topics/enclosed-space-entry-safety): A definitive marine engineering working guide on enclosed space entry. Covers risk assessment by the Chief Officer or Second Engineer, pre-entry meetings and work lists, minimising fire hazards, ventilation, oxygen and gas testing, permits to work, signs, standby men, lifelines, oxygen analysers, rescue and resuscitation equipment, and post-work checklist closure. - [Bilge Holding Tank Cleaning & Safe Entry](https://chartandkeel.com/topics/bilge-holding-tank-cleaning): A definitive marine engineering working guide on cleaning the bilge holding tank. Covers tank sounding, informing the bridge and discharging via the OWS outside special areas, the 15 ppm alarm, transferring to slop or shore, Oil Record Book entries, and the full enclosed space entry and cleaning precautions with permit closure. - [Propeller Fitting: Procedure & Securing to the Shaft](https://chartandkeel.com/topics/propeller-fitting-procedure): A definitive marine engineering working guide on fitting a propeller to its shaft. Covers shaft, bearing and keyway checks, dry fitting and marking the shaft, key fitting, lapping the propeller to the shaft taper for a 75% minimum contact, fitting and locking the nuts with a cotter pin, propeller painting, engine alignment, shaft zinc anodes, and performance logging. - [Types of Crude Oil: Sweet vs. Sour Crude](https://chartandkeel.com/topics/crude-oil-types-sweet-sour): A definitive marine engineering working guide on crude oil types. Covers the definition of crude, the H2S and sulphur limits that classify sweet and sour crude, their refining products, and the operational implications for corrosion, H2S toxicity and cargo handling on tankers. - [Sounding Pipe Regulations & Safety Features](https://chartandkeel.com/topics/sounding-pipe-regulation-safety): A definitive marine engineering working guide on sounding pipes. Covers SOLAS requirements for bilges, cofferdams and double bottom tanks in the machinery space, extension above the bulkhead deck and accessibility, minimum diameters of 32 mm and 65 mm for refrigerated and insulated spaces, and safety features such as the striking plate and self-closing parallel plug cap. - [International Shore, Bilge & Sewage Coupling Dimensions](https://chartandkeel.com/topics/international-shore-bilge-sewage-couplings): A definitive marine engineering working guide on standard ship couplings. Covers the purpose and requirement of the International Shore Connection (at least one on ships 500 GT and above), and the standard dimensions — outside diameter, inside diameter, bolt circle, flange thickness, slots, bolts and pipe bore — of the international shore, bilge and sewage couplings. - [Ship Dimensions & Basic Naval Architecture Definitions](https://chartandkeel.com/topics/ship-dimensions-basic-definitions): A definitive marine engineering working guide to the basic definitions surveyors ask. Covers principal dimensions (LOA, LBP, breadth, depth, draught, freeboard, camber, sheer, rise of floor, tumblehome), hydrostatics and form coefficients (displacement, TPC, Cw, Cm, Cb, Cp, wetted surface), propeller and slip terms, and hull plating and structural terms. - [Chain Locker, Bitter End & Anchor Cable Arrangement](https://chartandkeel.com/topics/chain-locker-bitter-end-cable-arrangement): A definitive marine engineering working guide on the chain locker. Covers its location forward of the collision bulkhead, the spurling pipe and hawse pipe path with canvas sleeve and eductor drainage, the bitter end quick-release securing arrangement on the collision bulkhead, centreline division, cable lifter and chain stopper, and access and drainage details. - [Cruiser & Transom Sterns, Cant Frames & Frame Spacing](https://chartandkeel.com/topics/cruiser-transom-stern-frame-spacing): A definitive marine engineering working guide on stern construction and frame spacing. Covers the frame spacing rules for the main body, peak tank and cruiser stern, cant frames and cant beams, cruiser stern stiffening with solid floors, centreline girder and horizontal stringers, and the transom stern with vertical stiffeners and deep floors. - [Bow Thrusters: Construction, Drive Types & Operation](https://chartandkeel.com/topics/bow-thruster-construction-operation): A definitive marine engineering working guide on bow thrusters. Covers their function in improving manoeuvrability and reducing tug use, the transverse cylindrical duct and impeller construction below the waterline, fixed-pitch versus controllable-pitch drives, electric/diesel/hydraulic power, and the cavitation and resistance considerations. - [The Propeller Shaft: Bearings, Couplings & Propeller Drop](https://chartandkeel.com/topics/propeller-shaft-bearings-seals-drop): A definitive marine engineering working guide on the propeller shaft. Covers the shaft line from the engine flywheel through the thrust block, shaft tunnel and stern tube, forged steel shaft construction with coupling flanges, fitted high-tension bolting and hydraulic tensioning, white metal half-bearings with splash lubrication, stern tube lip seals and liners, and the measurement of propeller drop using a Pokers gauge. ### Safety #### MARPOL - [MARPOL 73/78: The Convention & Its Six Annexes](https://chartandkeel.com/topics/marpol-convention-six-annexes): A definitive marine engineering working guide to MARPOL 73/78. Covers convention origins and global scope, the six annexes in precise technical order, statutory hardware boundaries, nautical distance matrices, and Port State Control verification protocols. - [MARPOL Annex I — Prevention of Pollution by Oil](https://chartandkeel.com/topics/marpol-annex-1-oil-pollution): A definitive marine engineering working guide to MARPOL Annex I. Covers its application and IOPP certificate, the key regulations and surveys, oil filtering equipment with the 15 ppm alarm, the standard discharge connection dimensions, the discharge criteria for machinery and tanker operations, the Oil Record Book Parts 1 & 2 entries, SOPEP and its equipment, and the ten special areas. - [MARPOL Annex II — Noxious Liquid Substances in Bulk](https://chartandkeel.com/topics/marpol-annex-2-noxious-liquid-substances): A definitive marine engineering working guide to MARPOL Annex II. Covers the revised categorization of liquid chemicals (Category X, Y, Z, OS), stripping residue standards (75 L vs 100/300 L), deepwell pump mechanics, mandatory prewash protocols, underwater discharge hydrodynamics, Cargo Record Book entries, and SMPEP emergency planning. - [MARPOL Annex III — Harmful Substances in Packaged Form](https://chartandkeel.com/topics/marpol-annex-3-harmful-substances-packaged): A definitive marine engineering working guide to MARPOL Annex III and the IMDG Code. Covers statutory packaging integrity, UN specification markings, 3-month seawater immersion standards, the nine classes of dangerous goods, hold segregation boundaries, container securing, and cargo hold bilge isolation protocols. - [MARPOL Annex IV — Prevention of Pollution by Sewage from Ships](https://chartandkeel.com/topics/marpol-annex-4-sewage): A definitive marine engineering working guide to MARPOL Annex IV. Covers statutory application (≥400 GT / >15 persons), aerobic biological Sewage Treatment Plant (STP) multi-chamber cutaways, comminuter macerator systems, holding tank methane venting, the 3 NM and 12 NM en-route discharge rules (≥4 knots), dimensioned standard discharge flange CAD, and Baltic Sea Special Area nitrogen/phosphorus removal standards. - [MARPOL Annex V — Prevention of Pollution by Garbage from Ships](https://chartandkeel.com/topics/marpol-annex-5-garbage): A definitive marine engineering working guide to MARPOL Annex V. Covers universal plastics prohibition, the 2013 revised discharge regime, mechanical food waste comminuter 25 mm screen engineering, color-coded garbage segregation stations, marine incinerators, Garbage Management Plans (GMP), and Garbage Record Book (GRB Parts I & II) statutory logging. - [MARPOL Annex VI — Air Pollution: SOx, NOx & Exhaust Gas Cleaning](https://chartandkeel.com/topics/marpol-annex-6-air-pollution-sox-nox): A definitive marine engineering working guide to MARPOL Annex VI. Covers statutory emission limits for Sulphur Oxides (SOx global 0.50% and ECA 0.10%), hybrid SOx scrubbers (open/closed loop), Nitrogen Oxides (NOx Tiers I, II, and III), Selective Catalytic Reduction (SCR) urea injection, fuel changeover thermal shock mitigation, and Bunker Delivery Note (BDN) sampling. - [MARPOL Annex VI — Emission Reduction, EEDI, EEXI & CII](https://chartandkeel.com/topics/marpol-annex-6-energy-efficiency): A definitive marine engineering working guide to the technical decarbonization and emission-reduction provisions of MARPOL Annex VI. Covers in-engine NOx reduction (Exhaust Gas Recirculation - EGR, slide-valve zero-sac injectors, water emulsification), the statutory NOx Technical File, the Energy Efficiency Design Index (EEDI) formula, Energy Efficiency Existing Ship Index (EEXI) Engine Power Limitation (EPL), and the operational Carbon Intensity Indicator (CII) rating matrix. #### SOLAS - [SOLAS Chapter IX — ISM Code & Safety Management Systems](https://chartandkeel.com/topics/solas-chapter-9-ism-code): A definitive marine engineering technical guide to SOLAS Chapter IX and the International Safety Management (ISM) Code. Covers the statutory regulations (Regs 1–6), dual-tier certification architecture (DOC issued to company, SMC issued to vessel), interim and short-term certificate regimes, functional Safety Management System (SMS) design, Designated Person Ashore (DPA) governance, Master overriding authority, Non-Conformity versus Major Non-Conformity escalation, and Port State Control operational detention criteria. - [SOLAS Chapter XI — ISPS Code & Maritime Security](https://chartandkeel.com/topics/solas-chapter-11-isps-security): A definitive marine engineering and security guide to SOLAS Chapters XI-1 and XI-2 and the International Ship and Port Facility Security (ISPS) Code. Details permanent ship identification numbering and Continuous Synopsis Records (CSR), the legal structure of Chapter XI-2, the 3-tier statutory security level escalation matrix, physical anti-piracy hardening and citadel architecture (BMP5), restricted area control, and the covert Ship Security Alert System (SSAS). - [SOLAS Chapter III — Life-Saving Appliances & Arrangements](https://chartandkeel.com/topics/solas-chapter-3-life-saving-appliances): A definitive marine engineering working guide to SOLAS Chapter III and the LSA Code. Covers the categories of life-saving appliances, personal LSA (lifebuoys, life jackets, immersion suits, anti-exposure suits, thermal protective aids), distress signalling equipment (pyrotechnics, two-way VHF, SART, EPIRB, GMDSS), general LSA (line throwing apparatus, EEBD, SCABA, general alarm) and their SOLAS requirements, markings and maintenance. - [SOLAS Chapter V — Safety of Navigation (AIS, LRIT & VDR)](https://chartandkeel.com/topics/solas-chapter-5-safety-of-navigation): A definitive marine engineering working guide to SOLAS Chapter V, Safety of Navigation. Covers the chapter's purpose and Regulation 19 carriage requirements, the Automatic Identification System (AIS) and S-AIS, Long-Range Identification and Tracking (LRIT) with its components and reporting, and the Voyage Data Recorder (VDR) — its protected storage unit and the data it records. - [SOLAS Chapter II-2 — Fire Protection, Detection & Extinction](https://chartandkeel.com/topics/solas-chapter-2-2-fire-protection): A definitive marine engineering working guide to SOLAS Chapter II-2 and the FSS Code. Covers the fire triangle, classes of fire and extinction methods, portable and semi-portable extinguishers (water, foam, CO2, DCP) with SOLAS regulations, maintenance and marking, fixed systems (CO2, sprinkler, hypermist, deck foam) and detectors, the fire main and emergency fire pump, the inert gas system, and the fire control and safety plan and muster list. - [SOLAS Chapter VII — Carriage of Dangerous Goods & IMDG Code](https://chartandkeel.com/topics/solas-chapter-7-dangerous-goods): A definitive marine engineering technical guide to SOLAS Chapter VII and the International Maritime Dangerous Goods (IMDG) Code. Details the statutory division of Parts A through D, the mandatory codes (IMDG, IBC, IGC, INF), the geotechnical and chemical classification of the 9 hazard classes, Packing Groups I–III, UN packaging drop and pressure testing specifications, marine pollutant marking under seawater immersion criteria, container cell guide segregation tables, and Port State Control operational detention powers. - [SOLAS Chapter XII — Additional Safety Measures for Bulk Carriers](https://chartandkeel.com/topics/solas-chapter-12-bulk-carriers): A comprehensive technical and naval architectural guide to SOLAS Chapter XII. Details the structural vulnerability of bulk carriers >= 150 m, catastrophic hold flooding dynamics, IACS UR S18 corrugated transverse bulkhead design under flooded hold pressure, dual-level Water Ingress Detection Systems (WIDS) per Regulation XII/12, remote forepeak dewatering systems, the Enhanced Survey Programme (ESP Code), and real-time hull stress loading computers. - [SOLAS Chapter II-1 — Construction: Subdivision, Stability, Machinery & Electrical](https://chartandkeel.com/topics/solas-chapter-2-1-construction-subdivision): A definitive marine engineering working guide to SOLAS Chapter II-1. Covers construction, subdivision and stability, watertight subdivision and permissible length, damage stability and the margin line, permeability and the bulkhead deck, machinery installations including the dead ship condition, emergency and transitional sources of electrical power, the emergency switchboard, and steering gear requirements. - [SOLAS Chapter VI — Carriage of Cargoes & Oil Fuels](https://chartandkeel.com/topics/solas-chapter-6-carriage-of-cargoes): A definitive marine engineering technical guide to SOLAS Chapter VI. Details statutory cargo information requirements, the International Maritime Solid Bulk Cargoes (IMSBC) Code classification, geotechnical mechanisms of cargo liquefaction and TML/FMP determination, International Grain Code stability calculation rules, Cargo Securing Manual (CSM) lashing engineering, hazardous atmosphere gas monitoring, and shipboard fuel safety. - [SOLAS Chapter IV — Radio Communications (GMDSS)](https://chartandkeel.com/topics/solas-chapter-4-radio-communications-gmdss): A definitive marine engineering working guide to SOLAS Chapter IV and GMDSS. Covers the purpose and application of the Global Maritime Distress and Safety System, the four sea areas A1 to A4, the nine functional requirements, the radio equipment carriage by sea area including EPIRB, SART and NAVTEX, the sources of energy and reserve source, the three maintenance options, and the radio log and radio personnel requirements. - [SOLAS Chapter VIII — Nuclear Ships & Reactor Safety](https://chartandkeel.com/topics/solas-chapter-8-nuclear-ships): A definitive marine engineering technical guide to SOLAS Chapter VIII and the IMO Code of Safety for Nuclear Merchant Ships (Res. A.491(XII)). Details the statutory reactor installation approval process, Pressurized Water Reactor (PWR) primary and secondary loop mechanics, the four physical containment barriers, Emergency Core Cooling System (ECCS) passive decay heat removal, 12-month Nuclear Safety Certificates, and Port State Special Control pre-entry radiation protocols. - [SOLAS Chapter X — Safety Measures for High-Speed Craft (HSC Code)](https://chartandkeel.com/topics/solas-chapter-10-high-speed-craft): A definitive marine engineering technical guide to SOLAS Chapter X and the International Code of Safety for High-Speed Craft (HSC Code). Details the statutory speed-displacement threshold equation, hydrodynamic craft configurations (catamarans, hydrofoils, surface effect ships), Category A vs Category B passenger craft architecture, High-Speed Craft Safety Certification and route-specific Permits to Operate (PTO), rapid Marine Evacuation System (MES) deployment physics, and Failure Mode and Effects Analysis (FMEA) governance. - [SOLAS Chapters XIII & XIV — Verification of Compliance & Polar Code](https://chartandkeel.com/topics/solas-chapter-13-14-verification-polar-code): A marine oral-exam guide to the two youngest SOLAS chapters: Chapter XIII verification of compliance (how the IMO audits flag states against SOLAS) and Chapter XIV Polar Code safety measures (entry 1 Jan 2017, who it covers, the Part 1-A/1-B and 2-A/2-B structure, and the Polar Ship Certificate). #### General - [Major Certificates & Documents to Carry On Board](https://chartandkeel.com/topics/major-ship-certificates-and-documents): A definitive marine engineering working guide to the certificates and documents carried on board. Covers the SOLAS certificates, plans and documents, the MARPOL Annex I–VI certificates and records, the Load Line, Tonnage, STCW, ILO and liability certificates, and the validity periods and supplements of the main statutory certificates. - [The Saturday Routine: Planned Maintenance Checks](https://chartandkeel.com/topics/saturday-planned-maintenance-routine): A definitive marine engineering working guide to the Saturday planned maintenance routine. Covers the every-Saturday, fortnightly and monthly checks of emergency and safety equipment — fire detection, general alarm, emergency fire pump, emergency air compressor, lifeboat engine, OWS, emergency batteries and lighting, CO2 system, remote stops, emergency steering gear, bilge suction, safety valves, engine safety devices and alarms — with the responsible officer for each. - [Dry-Docking: Preparation, Procedure & Survey](https://chartandkeel.com/topics/dry-docking-preparation-procedure): A definitive marine engineering working guide to dry-docking. Covers the preparation a few months before (repair list, tagging, tools and spares, staff organisation), a few days and hours before (ballasting and trim, bilge cleaning, soundings, fire equipment, shore services, crankshaft deflection, boiler shutdown, air bottles, tank topping), work coordination and bottom survey on the dock, and the after-docking checks. - [Bunkering & Oil Transfer: Precautions & Procedures](https://chartandkeel.com/topics/bunkering-oil-transfer-precautions): A definitive marine engineering working guide to bunkering and oil transfers. Covers the precautions before receiving bunkers (scuppers, hoses, pipeline tension, communication and emergency shutdown, vent pipes, fire and pollution equipment, signals), the precautions during oil transfer, correct tank changeover and quality control (sludge and water checks, settling and service tanks, purifiers, filters), and the golden rule never to change tanks during manoeuvring. - [Conditions of Assignment of Freeboard](https://chartandkeel.com/topics/conditions-of-assignment-of-freeboard): A definitive marine engineering working guide to the Conditions of Assignment of Freeboard. Covers the construction and stability conditions, superstructure end bulkheads, hatchways with portable and weathertight covers, machinery space openings, ventilators, air pipes, cargo ports and side openings, scuppers/inlets/discharges, side scuttles, freeing ports and protection of crew. - [Why Oil Tankers Have Less Freeboard](https://chartandkeel.com/topics/why-oil-tankers-have-less-freeboard): A definitive marine engineering working guide explaining why oil tankers are assigned a smaller freeboard. Covers the reduced number and size of openings that can be closed efficiently, greater subdivision by transverse and longitudinal bulkheads, the very low permeability of oil-filled tanks (about 5% against 60–65% for grain), the lower density of oil cargo, and the much larger and better pumping arrangements. - [Safety on Oxygen & Acetylene Bottles](https://chartandkeel.com/topics/oxygen-acetylene-bottle-safety): A definitive marine engineering working guide to oxygen and acetylene bottle safety. Covers flashback arrestors, cylinder colour coding, the right-hand thread on oxygen and left-hand thread on acetylene, storing the bottles in separate rooms, and the wider precautions for oxy-acetylene welding and cutting on board. - [Tonnage Measurement: Gross & Net Tonnage](https://chartandkeel.com/topics/tonnage-measurement-gross-net): A definitive marine engineering working guide to tonnage measurement. Covers the International Convention on Tonnage Measurement of Ships 1969, its adoption and entry into force, the definition and formula for Gross Tonnage (GT = K1 V), the deduction spaces and formula for Net Tonnage (NT), the K1/K2/K3 coefficients and passenger terms, the limiting values, and why tonnage is important. - [Load Line: Marks, Letters & Conventions](https://chartandkeel.com/topics/load-line-marks-convention): A definitive marine engineering working guide to the Load Line. Covers the Plimsoll mark and its derivation from the Load Line Rules, the load line letters (TF, F, T, S, W, WNA and Timber L), the fresh water and sea water densities, the relationship of the marks, the class society initials, the Load Line Convention 1966 (adopted 1966, enforced 21 July 1968, Protocol 1988), certificate validity and why the mark appears on both sides. - [Loadicator / Loading Computer](https://chartandkeel.com/topics/loadicator-loading-computer): A definitive marine engineering working guide to the loadicator (loading computer). Covers its purpose and siting for the Master and loading officers, the ship types that use it, its aim of ensuring adequate stability on departure without costly delays, the changing variables (bunkers, water, stores) and arrival conditions, and the outputs it provides — shear forces, bending moments, tonnage distributions, loaded GM, sailing draughts and deadweight. - [Difference Between Audit and Survey](https://chartandkeel.com/topics/difference-between-audit-and-survey): A definitive marine engineering working guide explaining the difference between an audit and a survey. Covers the focus of each (hardware vs system/procedures/documentation/software), the purpose, who carries them out, and practical examples showing how an audit investigates why a deficiency was not found earlier while a survey verifies the physical status of the machinery. - [Emergency Generator: Testing & Requirements](https://chartandkeel.com/topics/emergency-generator-testing-requirements): A definitive marine engineering working guide to the emergency generator. Covers its purpose and the requirement for two modes of starting, the weekly and monthly testing schedule, the battery, hydraulic and automatic start procedures, the requirements for emergency generating sets (cold start, three consecutive starts, second source of energy, stored energy maintenance) and the essential services supplied. - [Starting Air Compressors, Receivers & Air Bottle Safety](https://chartandkeel.com/topics/starting-air-compressors-receivers-safety): A definitive marine engineering working guide to starting air compressors and air receivers. Covers the requirement for two starting compressors and their capacity, the 15 to 25 bar in 30 minutes pumping rule, two air receivers and the 12/6-start capacity for reversible and non-reversible engines, the mountings and fittings on an air bottle, and the safety devices. - [MGPS — Marine Growth Prevention / Anti-Fouling System](https://chartandkeel.com/topics/marine-growth-prevention-system-mgps): A definitive marine engineering working guide to the Marine Growth Prevention System (MGPS). Covers marine growth and the damage it causes, the electrolysis principle with copper and aluminium anodes and their reactions, the copper-ion anti-fouling effect and the aluminium anti-corrosion film, the sea-chest anode arrangement and control unit with impressed current, typical current values, and the causes of failure. - [Quick Closing Valve: Construction & Working](https://chartandkeel.com/topics/quick-closing-valve-construction-working): A definitive marine engineering working guide to the quick closing valve. Covers its purpose in unmanned machinery spaces, the construction (valve trim, spindle, spring, lever and control piston), the working principle from the normally-open position to closure, the difference from a pressure relief valve, and the pneumatic or hydraulic remote operating mechanism. - [How to Measure the Depth of the Ship (Echo Sounder)](https://chartandkeel.com/topics/measuring-ship-depth-echo-sounder): A definitive marine engineering working guide on measuring the depth of the ship. Covers the echo sounder principle of reflecting an echo of waves transmitted by a wave generator, the formula S = V × T (and depth = V × T / 2), the transducer transmitter/receiver, the speed of sound in water, and the uses and factors affecting accuracy. - [New Amendments (1 January 2013): SOLAS & MARPOL](https://chartandkeel.com/topics/new-amendments-2013-solas-marpol): A definitive marine engineering working guide to the amendments entering into force on 1 January 2013. Covers the SOLAS amendments for lifeboat on-load release mechanisms (new paragraph 5 to regulation III/1, replacement by the first dry-docking after 1 July 2014 and not later than 1 July 2019), the MARPOL Annex VI energy efficiency chapter (EEDI and SEEMP), the US Caribbean Sea ECA, the Baltic Sea Special Area under Annex IV, and the revised Annex V garbage provisions. - [Ship Accommodation, Midship Section & Container Stowage](https://chartandkeel.com/topics/ship-midship-section-container-stowage): A definitive marine engineering working guide on ship particulars and container stowage. Covers knowing your ship's accommodation length, cargo hold length and container capacity, securing containers in the hold, the midship section of a container ship, the TEU and FEU definitions and standard container dimensions, and the tare, net and gross weight relationship. - [Rudder: Construction, Types & Support](https://chartandkeel.com/topics/rudder-construction-types-support): A definitive marine engineering working guide to the rudder. Covers rudder construction (welded plates and frames, hollow buoyant body, protective coating and foam, drain plug, flush fitting, lifting tube, 2.4 m pressure test), balanced versus unbalanced and semi-balanced rudders, rudder support by pintle or lower bearing with split rings on the sole piece, the lifting (jumping) movement limited by the jumper bar, and special types such as fully balanced, spade and twin rudders. - [Fuel Consumption & Speed Relationship](https://chartandkeel.com/topics/fuel-consumption-speed-relationship): A marine engineering guide to the relationship between a ship’s fuel consumption and its speed. Covers how consumption depends on the power developed, specific fuel consumption (SFOC) in kg/kWh (efficient diesel about 0.20 kg/kWh, steam turbine about 0.30 kg/kWh), the propeller cube law (fuel ∝ speed³), daily fuel consumption in tonnes, and the fuel coefficient with a value between 40,000 and 120,000. - [Maritime Codes & Conventions: The Complete List](https://chartandkeel.com/topics/maritime-codes-and-conventions-list): A definitive oral-exam reference listing the international maritime CODES and CONVENTIONS asked about on board. Covers ISM, IMDG, FSS, LSA, IMSBC, IBC, ISPS and the NOx Technical Code, together with SOLAS, MARPOL, STCW, Load Line, Tonnage, Ballast Water Management and the Antifouling Convention, explaining what each abbreviation means. - [STCW: The Convention & Its Eight Chapters](https://chartandkeel.com/topics/stcw-convention-eight-chapters): A concise oral-exam guide to the STCW Convention — the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers. Sets out the meaning of STCW and lists all eight chapters, from general provisions and the deck, engine and radio departments through special training, emergency and medical care, alternative certification and watchkeeping. #### Life Saving Appliances - [LSA Chapter 1: Categories of LSA & Personal Life-Saving Appliances](https://chartandkeel.com/topics/life-saving-appliances-chapter-1-personal-lsa): A definitive marine engineering oral-exam guide to LSA Chapter 1 from Part 1 (Life Saving Appliances) of the Safety file. Covers the categories of life-saving appliances and their abbreviations, lifebuoy SOLAS regulation (size, weight, accessories, markings), life jacket regulation and H.E.L.P., immersion suits and hypothermia, anti-exposure suits and thermal protective aids. - [LSA Chapter 2: Pyrotechnics, VHF, SART, EPIRB & GMDSS](https://chartandkeel.com/topics/life-saving-appliances-chapter-2-distress-signalling): A definitive marine engineering oral-exam guide to LSA Chapter 2 from Part 1 (Life Saving Appliances) of the Safety file. Covers pyrotechnics (rocket parachute flares, hand flares, buoyant smoke signals), two-way VHF radiotelephone apparatus, SART operation on 9 GHz against the 3-cm X-band radar, EPIRB frequencies and float-free release, and GMDSS under SOLAS Chapter 5. - [LSA Chapter 3: Line Throwing, EEBD & SCABA](https://chartandkeel.com/topics/life-saving-appliances-chapter-3-general-lsa): A definitive marine engineering oral-exam guide to LSA Chapter 3 from Part 1 (Life Saving Appliances) of the Safety file. Covers the line throwing apparatus (pistol versus integral types, projectiles, lines and firing drill), EEBD locations, wearing procedure, prohibitions, charging and checks, and SCABA construction, air consumption with worked duration example, low-pressure alarm testing, function checks, doffing, mask care and maintenance intervals. - [LSA Chapter 4: Life Rafts — Capacity, Equipment & Launching](https://chartandkeel.com/topics/life-saving-appliances-chapter-4-liferaft): A marine oral-exam guide to LSA Chapter 4 covering life raft types, CO2 plus nitrogen inflation, capacity and construction limits, the 25 items of raft equipment with exact quantities, container and raft markings, built-in safeties, full manual launching with embarkation and righting drill, automatic HRU release with weak link, forward versus aft stowage, and davit launching. - [LSA Chapter 5: Lifeboats — Types, Engine, Davit & Drills](https://chartandkeel.com/topics/life-saving-appliances-chapter-5-lifeboat): A marine oral-exam guide to LSA Chapter 5 covering lifeboat types and approval certificates, strength and launching rules, the compression-ignition engine and fuel system, post-2014 hook release rules, tanker enclosed-boat specialties, 30 equipment items with exact quantities, markings, davit safety devices, weekly and 3-monthly maintenance, the full no-start check list, dead-man handle use, lowering drill and freefall rules. #### Fire Safety - [Classes of Fire & Portable Fire Extinguishers on Ships](https://chartandkeel.com/topics/classes-of-fire-portable-extinguishers-ship): A definitive marine engineering oral-exam guide to classes of fire and portable fire extinguishers on ships. Covers classes of fire and suitable media, the fire tetrahedron and extinction methods, SOLAS portable extinguisher rules, water soda-acid and foam mechanical types, CO2 and DCP types with operation, markings, semi-portable extinguishers, maintenance tables, weighing, and the oral drill. - [Ship Fire Detectors: Heat, Smoke & Flame Types](https://chartandkeel.com/topics/fire-detectors-ships-heat-smoke-flame): A definitive marine engineering oral-exam guide to fire detectors on ships. Covers the detector family tree, heat detector locations and types with operating bands, smoke detector locations and working principles, flame detectors, the detector spacing table, and the oral drill. - [CO2 Fixed Fire-Fighting System on Ships](https://chartandkeel.com/topics/co2-fixed-fire-fighting-system-ships): A definitive marine engineering oral-exam guide to the CO2 fixed fire-fighting system on ships. Covers the smothering and cooling principle, fixed-system regulation for category-A machinery spaces, CO2 bottle construction and fittings, the CO2 room, system safeties and leak hunting, quantity calculation with worked vessel example, bottle weighing, maintenance intervals, and engine-room and purifier-room fire actions with prevention. - [Ship Sprinkler & Hypermist (Water Mist) Systems](https://chartandkeel.com/topics/sprinkler-hypermist-water-mist-system-ship): A marine oral-exam guide to fixed sprinkler and hypermist water-mist systems on ships: SOLAS application, head spacing and hydraulics, fittings, bulb colour ratings, the full bridge/ER/control-room test procedure, maintenance, and the hypermist two-detector chain protecting running machinery. - [Ship Fire Main & Emergency Fire Pump System](https://chartandkeel.com/topics/ship-fire-main-emergency-fire-pump-system): A marine oral-exam guide to the ship fire main and emergency fire pump system: its cooling and 1600× smothering purpose, jet/spray/boundary application, main pumps with remote start, the emergency fire pump outside machinery spaces, hoses and dual-purpose nozzles, hydrant pressures, and relief, drain, isolating valves and main diameter. - [Deck Foam & Inert Gas (IG) Systems on Tankers](https://chartandkeel.com/topics/deck-foam-inert-gas-system-tankers): A marine oral-exam guide to fixed deck foam and inert gas systems on tankers: foam principle and protein, fluoroprotein, alcohol-resistant and synthetic types, SOLAS deck-foam rates and full component list, flammability limits with T+P effects, IG plant parts, uptake-to-tank working flow, oxygen and hydrocarbon control, and dilution versus displacement replacement. - [Fire Control Plan, Muster List & Flooding Response](https://chartandkeel.com/topics/fire-control-plan-muster-list-ship): A marine oral-exam guide to the ship fire control plan and muster list: plan stowage and full contents, the SOLAS muster list under Chapter 3 Section 5 Regulation 37 with crew, officer and passenger duties, and the engine-room flooding response from alarm to emergency bilge suction. ### Marine Propulsion & Diesel Engines #### Engine Basics & Cycles - [Theoretical Cycles — Otto, Diesel & Dual Combustion](https://chartandkeel.com/topics/theoretical-cycles-otto-diesel-dual): A clear guide to IC-engine theory: the air-standard assumptions behind all three cycles, Otto heat at constant volume, Diesel heat at constant pressure, dual heat split across both — and which real engine each one describes. - [Diesel Engine Basics — Terms, Strokes & Timing](https://chartandkeel.com/topics/diesel-engine-basics-terminology): A clear guide to diesel fundamentals: TDC, BDC, stroke, swept and clearance volumes with the compression-ratio formula, the four-stroke event sequence, the two-stroke combined cycle with scavenge blower, and reading a timing diagram. - [Diesel Engine Types — 2-Stroke Crosshead vs 4-Stroke Trunk](https://chartandkeel.com/topics/diesel-engine-types-compared): A clear guide to diesel classification by speed, use, operation, arrangement and cycle — then the complete two-stroke crosshead vs four-stroke trunk comparison: power, starting, reversing, scavenging, weight, space and upkeep. - [Engine Nomenclature — Decode MAN, Sulzer, Daihatsu & Spec Sheets](https://chartandkeel.com/topics/marine-engine-model-designation-codes): A quick-fire guide to marine engine model codes: MAN B&W letter-by-letter decode with K/L/S/G stroke classes, Sulzer RTA breakdown, B&W L-GFCA aux codes, Yanmar EY and Daihatsu DL/DK aux designations, plus how to read a spec sheet (MEP, Pmax, SFOC, liner wear, cylinder-oil consumption). #### Two-Stroke Construction - [Two-Stroke Structure — Frame, Tie Rods, Liner, Piston & Crosshead](https://chartandkeel.com/topics/two-stroke-engine-structure): A clear guide to two-stroke construction: the eight-part load path, frame rigidity rules with steel spec, tie-rod sandwich with tensioning and breakage drill, cylinder cover with five mountings, liner ports with free downward expansion, concave cooled pistons, and the crosshead that spares the liner. - [Marine Crankshafts — Builds, Bedplate, Chocks & Alignment](https://chartandkeel.com/topics/marine-crankshaft-types): A clear guide to large crankshafts and their foundation: why size forces built construction, fully-built vs semi-built vs welded vs solid builds with grain-flow logic, witness marks, fabricated bedplate with holding-down bolts and epoxy chocks, and the full misalignment cause list. - [Engine Bearings — Renewal, Crosshead to Thrust Block](https://chartandkeel.com/topics/engine-bearings-guide-thrust): A clear guide to large-engine bearings: boundary vs hydrodynamic regimes, guide shoes, crosshead oil timing, Sulzer and MAN bottom ends, thin-shell mains with crush and reliefs, trunk-engine mains and gudgeons, the Michell thrust block, and the 22-step main-bearing renewal with depth-gauge measurement and hydraulic jacking. - [Chain Drive & Camshaft — Timing Transmission](https://chartandkeel.com/topics/chain-drive-camshaft-inspection): A clear guide to camshaft drives: everything the chain powers, roller-and-pin construction with tensioning, the full wear inspection, and camshaft sections with shrunk cams driving valves, pumps, lubricators and distributors. - [Stuffing Box — Sealing Rings, Clearances & Running-In](https://chartandkeel.com/topics/stuffing-box-sealing-rings-running-in): A hands-on guide to piston-rod stuffing boxes and ring sealing: the sludge-scraper, sealing and oil-scraper ring sets with garter springs and drains, liner–piston sealing by gas pressure with axial, radial and butt clearances, stuffing-box gap and groove limits with leakage diagnosis, and the breaking-in plus running-in programme with TBN practice. #### Four-Stroke Engines - [Four-Stroke Aux Engines — Layout to Lubrication](https://chartandkeel.com/topics/four-stroke-aux-engine-design): A clear guide to marine four-strokes: speed bands and diesel-electric placement, fixed vs moving component layout, MAN vee residual-fuel engineering with pressures and bearings, caged valves with roto-caps, tandem pumps, cocktail-shaker pistons, articulated rods and trunk lubrication with oil-fuel separation. #### Gas Turbines - [Gas Turbines — Continuous Combustion at Sea](https://chartandkeel.com/topics/gas-turbine-marine-working): A clear guide to marine gas turbines: three-section continuous combustion with the 55–65% compressor tax, Brayton performance levers with combined-cycle recovery, steam-vs-gas comparison, COGES at sea, and the five auxiliary systems. #### Steam Boilers - [Steam Boilers — Heat, Circulation, Types & EGB Fire](https://chartandkeel.com/topics/steam-boilers-types): A clear guide to marine boilers: steam duties aboard, radiation/conduction/convection working together, density-driven circulation with stagnation dangers, the full type catalogue, Scotch fire-tube anatomy, water-tube designs to 60 bar, and EGB tube types with deposit ignition, minor-vs-major escalation and fire response. - [Boiler Water, Combustion, Draft & Economiser Leaks](https://chartandkeel.com/topics/boiler-water-combustion-draft): A clear guide to boiler operation systems: gauge glasses with blow-through and false-level diagnosis, magnetic and Igema remote indication with the low-level drill, four-stage combustion with registers and burners, pressure-fired vs balanced draft with fan control, and economiser tube-leak finding with fire response. - [Boiler Water Chemistry — 7 Tests, Treatment & Pressure Proof](https://chartandkeel.com/topics/boiler-water-chemistry-tests-treatment): A hands-on guide to marine boiler-water chemistry and proof testing: the 7 chemical tests with surveyor-accepted limits, hydrazine oxygen scavenging with blowdown control, caustic embrittlement and corrosion enemies, DP level control, the accumulation-of-pressure test with its 10% rule and timings, and the gauge-glass blow-through drill. #### Performance & Indication - [Indicator Diagrams & Engine Performance](https://chartandkeel.com/topics/indicator-diagrams-performance): A clear guide to performance evaluation: the ten-parameter load picture, IP/BP/efficiency definitions, the PmLAN calculation with stroke rules, twelve-step card procedure with precautions, four card types with fault reading, and at-sea adjustment discipline. #### Engine Operation - [Two-Stroke Start Preparation — the Two-Hour Notice](https://chartandkeel.com/topics/two-stroke-start-preparation): A clear guide to preparing a large two-stroke: three control stations, air/LO/cooling/fuel system checks with key temperatures, drains, turning-gear discipline with blow-through inside 30 minutes, and the voyage-ready checklist. - [Starting & Reversing the Two-Stroke](https://chartandkeel.com/topics/starting-reversing-two-stroke): A clear guide to starting and reversing: distributor-sequenced air admission at 15–30 bar with interlocks and receiver rules, four reversing arrangements with cam-shift methods, timing changes per direction, class and SOLAS astern rules, and electronic ECU/CCU control. - [Manoeuvring, Port Ops & Engine Vigilance](https://chartandkeel.com/topics/manoeuvring-port-operations): A clear guide to engine handling at the edges of the voyage: manoeuvring signal logic with interlocks and bridge control, full-away and port-approach drills with economiser and fuel changeover, abnormality diagnosis by parameter, and alarm-system architecture. - [Four-Stroke Operation — Alternator Duty](https://chartandkeel.com/topics/four-stroke-operation-alternator): A clear guide to running four-stroke prime movers: trip and alarm devices with OMD behaviour, the plant-equipment map, pre-operation checks, start/run/stop procedures with warm-up and cooldown, and gearbox/coupling vigilance. #### Lubrication & Fuel Systems - [Lube Oil & Fuel Systems — Properties, Treatment & Changeover](https://chartandkeel.com/topics/lo-fuel-systems-treatment): A clear guide to engine oil and fuel circuits: the four LO functions, sump-to-bearing distribution with separate cylinder oil against sulphuric acid, continuous and batch purification numbers, fuel characteristics from CCAI to cat fines, representative sampling, microbial defence, and HFO/DO systems with changeover cases. #### Safety & Troubles - [Safe Operation — Vigilance & Human Error](https://chartandkeel.com/topics/safe-operation-vigilance): A clear guide to engine-room vigilance: the thirteen-point watch routine with senses and gauges, six classic human-error failures with their preventions, and the four major hazards (air-line, crankcase, scavenge, surge) with first-recognition signs. - [Engine Protections, Vibration Watch & Performance Curves](https://chartandkeel.com/topics/engine-protections-performance): A clear guide to engine safeguarding and economy: the four protection layers with slow-down, shut-down and interlock set points, UMS surveillance context, vibration families with barred critical-speed discipline, the ten performance curves with what each diagnoses, and slow-steaming cubic-law economics. - [Starting & Running Troubles — No-Start to Knock](https://chartandkeel.com/topics/starting-running-troubles): A clear fault-finding guide: no-start/slow-start/no-fire cause lists with cut-outs included, dead-cylinder priming, smoke-colour reading, slowdown and irregularity hunts, the one-cylinder fuel-cut knock test, and the hot-piston drill that never stops the engine cold. - [Explosion Physics — Mist, Doors & Detectors](https://chartandkeel.com/topics/explosion-physics-omd-relief): A clear guide to crankcase-explosion science: mist generation with LEL numbers, white-mist formation, primary-to-secondary shock physics, Graviner detector optics with selector logic, and relief-door construction with area rules and tests. #### Governor & Scavenging - [Governors — Flyweights, Hydraulics & Dead Band](https://chartandkeel.com/topics/governors-mechanical-hydraulic): A clear guide to speed governors: why automatic control beats any operator, the measure-then-move loop driving fuel racks, three governor families, mechanical load-up/load-down action, the hydraulic buffer-compensation sequence that lands smoothly, and the dead band that suppresses fluctuation. - [Scavenging, Turbocharging & Surge](https://chartandkeel.com/topics/scavenging-turbocharging-surge): A clear guide to gas exchange: the scavenging task with cross, loop and uniflow geometries, waste-heat supercharging with intercooling, pulse vs constant-pressure trade-offs, surge mechanism with symptoms and remedies, and turbine/blower washing practice. - [Engine Controls & Measurement — Bridge to Shaft](https://chartandkeel.com/topics/engine-controls-measurement): A clear guide to control transfer drills, strain-gauge torsionmeters with frequency telemetry, and computer indicator diagrams with crank-angle overlays plus fine-tuning rules. #### Motor Oral Questions - [Marine Propulsion Oral Exam Questions — Engine, Fuel Systems & Troubles](https://chartandkeel.com/topics/motor-viva-propulsion): High-yield MEO oral questions with model answers across cycles and ratings, tie rods and stuffing boxes, crosshead and shaft, fuel timing with viscotherm control, combustion diagnosis, and starting, reversing and safety drills — each closed mechanism-first. - [Marine Auxiliaries Oral Exam Questions — Pumps, Air, Purifiers, Boilers & Steering](https://chartandkeel.com/topics/motor-viva-systems): High-yield MEO oral questions with model answers across pumps and exchangers, multistage air with bursting-disc and bumping drills, purifiers with gravity-disc selection, FWG vacuum faults, refrigeration charge reading, boiler water with safety-valve and accumulation proof, EGB and soot care, steering safeties, and sampling and instrument discipline. ### Auxiliary Machinery & Shipboard Systems #### Shaft Seals & Packing - [Shaft Seals & Packing — Wiper Rings, Mechanical & Labyrinth Seals](https://chartandkeel.com/topics/shaft-seals-packing-mechanical-labyrinth): What shaft seals do on pumps, valves and the stern tube, how oil control and wiper rings keep crankcase oil out of the cylinder, the 7 seal terms examiners love, why mechanical seals replaced packing, and how labyrinth stages drop gas pressure without contact. #### Heat Exchangers - [Shell & Tube Heat Exchangers — Cleaning, Retubing & Leak Detection](https://chartandkeel.com/topics/shell-tube-he-cleaning-retubing): Shell and tube cooler maintenance from first principles: fixed-vs-floating-plate construction with shell corrugations, calendar routines, safe isolation, backflush, mechanical and chemical cleaning, sacrificial anodes with electrical continuity, full dismantle–retube–assemble–pressure-test sequence including extension tools, and trickle, halo, bubble plus shell-pressurisation leak detection with tube plugging and running-engine leak reads. - [Plate Heat Exchangers — Cleaning, Tightening & Gaskets](https://chartandkeel.com/topics/plate-he-cleaning-gaskets): Plate cooler maintenance from first principles: pack construction and tightening discipline, backflushing, measured opening and gentle cleaning, gasket chemistry and replacement, faulty-plate exchange, service limits, and a shell-vs-plate comparison with yearly routines. #### Air Compressors & Receivers - [Reciprocating Air Compressors — Operation & Overhaul](https://chartandkeel.com/topics/air-compressor-operation-overhaul): A hands-on guide to marine reciprocating air compressors: two air pressures and their uses, two-stage compression with intercooling, manual and automatic operation, hour-based routines with filter and oil care, full strip-down part by part, bumping clearance measurement, and plate-valve overhaul with return to service. - [Compressor Safety Devices, Unloader & Air Receivers](https://chartandkeel.com/topics/air-compressor-safety-receiver): A hands-on guide to compressor protection and storage: relief valves, bursting discs, fusible plugs and the trip family; unloader duty in starting, stopping and moisture control; symptom-to-cause troubleshooting; and receiver construction, mountings and enclosed-space inspection. #### Pumps - [Centrifugal Pump Overhaul — Isolation, Strip, Measure, Rebuild](https://chartandkeel.com/topics/centrifugal-pump-overhaul): A hands-on guide to centrifugal pump upkeep: the four pump families, dual isolation with pressure proof, full top-down dismantling, wear-ring and seal inspection with measurements, and reassembly with purge, seal proving and performance checks. - [Reciprocating Pumps — Strokes, Air Vessels & Fault-Finding](https://chartandkeel.com/topics/reciprocating-pump-bilge-stripping): A hands-on guide to reciprocating pumps: suction and delivery strokes with set-pressure valves, air-vessel smoothing on both lines, double-acting and duplex bilge layouts, direct vs indirect drive, wear hotspots, NPSH and cavitation, and a full condensed fault-finder. - [Gear & Screw Pumps — Rotary Overhaul, Backlash & Alignment](https://chartandkeel.com/topics/gear-screw-pump-overhaul): A hands-on guide to rotary positive-displacement pumps: gear-pump transport between meshing teeth, screw-pump timing gears and relief protection, full preparation with shim discipline, strip-and-rebuild, backlash measurement with renewal limits, and alignment that decides their life. #### Steering Gear - [Steering Gear — Ram vs Vane, 12-Hour Test, Filters, Oil Charging & Air Purging](https://chartandkeel.com/topics/steering-gear-oil-air-purge): A hands-on guide to electro-hydraulic steering: ram vs rotary-vane circuits with twin power units, the 12-hour pre-departure test and quarterly local-control drills, daily-to-drydock routines, safe isolation, 50-micron and silt filter service, storage-tank oil charging, and cylinder-by-cylinder air purging. #### Refrigeration & AC - [Reefer Oil Control, Separators, TEV & Safety Cutouts](https://chartandkeel.com/topics/reefer-oil-separator-tev): A hands-on guide to reefer oil management and metering: why carry-over happens, the four separator techniques with float return and hand-read diagnosis, oil charging and strainer routines, TEV construction and superheat balance, the 0.15-bar external-equaliser rule with internal-vs-external tap logic, room thermostats with ON/OFF solenoids, and HP/LP plus 1.2-bar oil-differential protection. - [Reefer Servicing — Pump-Down, Charging, Leaks, Valves, Defrost & Faults](https://chartandkeel.com/topics/reefer-charging-troubleshooting-defrost): A hands-on guide to reefer servicing: pump-down isolation with safe permits, air detection and purging by stratification, weighed charging through the liquid side, copper-pipe ferrule repair, suction and discharge valve tests, defrost systems with brine temperatures, and a full indication-cause-action fault table. #### Purifiers & Centrifuges - [Purifier Operation — Separation, Start-Up & Oil Limits](https://chartandkeel.com/topics/purifier-operation-separation): A hands-on guide to centrifugal purifiers: bowl flow path and disc-stack separation, purifier vs clarifier with interface control, the eight separation factors, full manual start-stop with sealing-water proof, LO-purifier start, and water-in-oil and fuel-dilution limits with remedies. - [Purifier Bowl & Drive Maintenance — Heights, Conversion & 8000-Hour Service](https://chartandkeel.com/topics/purifier-bowl-drive-maintenance): A hands-on guide to purifier internals: bowl balance rules with full isolation, sliding-bowl discharge hydraulics with part-by-part service limits, bowl and vertical-shaft height measurement with high-low failure logic, purifier-to-clarifier conversion, friction-clutch purpose, horizontal worm-drive overhaul, and vertical-spindle bearing and deposit discipline. - [Centrifugal Purifier Troubleshooting — Faults, Causes & Fixes](https://chartandkeel.com/topics/purifier-faults-troubleshooting): A fault-first guide to centrifugal purifiers: bowl open-close hydraulics, oil-to-sludge-outlet causes, self-opening vs no-discharge alarms, extra separation factors, vibration and speed diagnosis, gear-case, clutch and feed-valve actions, plus the full batch-purification, sump-level and seawater rescue rituals. #### Pipelines & Valves - [Ship Pipelines — Seawater, Bilge, Ballast & Fuel Systems](https://chartandkeel.com/topics/pipelines-systems-bilge-ballast): A hands-on guide to ship pipe systems: ancillary lineup, seawater circuit corrosion defence, bilge vacuum loss and back-flood leak testing, ballast and bunkering with expansion and class rules, heating coils, and air and sounding pipes as flooding paths. - [Globe & Gate Valves — Overhaul, Seats & Testing](https://chartandkeel.com/topics/globe-gate-valve-overhaul): A hands-on guide to globe and gate valve overhaul: throttling vs isolation duty, globe strip-inspect-lap sequence with seat-leak correction, centering-critical reassembly, water-plus-air and pressure-drop tests, and gate silt and wire-drawing faults. - [Butterfly Valves & Sea Chest Filters](https://chartandkeel.com/topics/butterfly-valve-sea-chest): A hands-on guide to butterfly valves and sea chest strainers: quarter-turn sealing in a resilient seat, inspection points, pin-and-stem rebuild with new elastomers, plus the standby-first sea chest changeover and cleaning that keeps cooling alive. #### OWS & STP - [Oily Water Separator (OWS) — Working Principle, 15 ppm OCM & Siphon Breaker](https://chartandkeel.com/topics/ows-working-principle-15ppm): A hands-on guide to the oily-water separator: gravity first stage to 100 ppm, coalescer second stage to the 15 ppm OCM gate with 3-way recirculation, capacitance-probe auto-drain with diaphragm valve, and the siphon-breaker vented loop that stops unmonitored overboard creep. - [Sewage Treatment Plant (STP) — Working, Bacteria, BOD & Troubleshooting](https://chartandkeel.com/topics/sewage-treatment-plant-working-troubleshooting): A hands-on guide to the shipboard sewage treatment plant: aeration, settling and chlorine-sterilisation chambers, aerobic versus anaerobic bacteria, BOD and coliform certificate numbers, duty-standby blower logic at 0.5–0.8 bar, and the fault table for black effluent, carryover and disinfection failure. #### Workshop & Practicals - [Marine Workshop Practicals — Vernier, NDT, Heat Treatment, Threads & Changeovers](https://chartandkeel.com/topics/workshop-practicals-vernier-threads-ndt): A hands-on guide to engine-room workshop practicals: vernier caliper and micrometer reading with least count and zero error, dye-penetrant NDT in four coats, heat-treatment routes from hardening to annealing, internal and external thread making with drill-size formula and buttress/round forms, gland-packing sizing and gasket PCD, plus duplex-filter and sea-chest changeover drills. #### FWG & Hydrophore - [Fresh Water Generator — Vacuum Boiling, Operation & Faults](https://chartandkeel.com/topics/fwg-operation-troubleshooting): A hands-on guide to freshwater generators: vacuum-boiling principle with jacket-water heat, full start-up sequence and running checks, plate-type and flash-evaporator flow paths with brine control, high-salinity and low-capacity fault tables, reverse-osmosis rival, and drinking-water sterilisation rules. - [Hydrophore & Water Supply — Pressure on Demand](https://chartandkeel.com/topics/hydrophore-water-supply): A hands-on guide to hydrophore pressure-water systems: air-cushion pressure control with cut-in and cut-out, duty-standby pump logic, vessel and control safety, fresh vs sanitary circuits, pneupress tank levels with air top-up, calorifier, UV and dosing, and circulation against bacteria. #### Main Engine Maintenance - [Scavenge Space & Crankcase Inspection — Reading the Engine from Inside](https://chartandkeel.com/topics/scavenge-crankcase-inspection): A hands-on guide to two-stroke inspection windows: reading combustion and lubrication health through the scavenge ports, and the full crankcase running-gear checklist from bedplate welds to relief-door spring tests and LO flow prove-up. - [Crankshaft Deflection, Vibration & Failure Prevention](https://chartandkeel.com/topics/crankshaft-deflection-slip): A hands-on guide to crankshaft alignment and vibration: why uneven main-bearing wear bends the shaft, five-position dial-gauge measurement with even-keel discipline, the deflection curve that isolates the faulty bearing, secondary-inertia balancing with barred critical-speed discipline for torsional and axial vibration, crankweb slip recovery, and failure causes with precautions. - [Piston, Liner & Rings — Wear, Clearances & Overhaul](https://chartandkeel.com/topics/piston-liner-rings-overhaul): A hands-on guide to the combustion chamber: liner calibration with templates and wear limits, crown thermal stress and burn-away, the three ring functions with axial, butt and back clearances, safe piston withdrawal, cradle inspection, and broken-ring and micro-seizure diagnosis with standing orders. - [Engine Fires & Explosions — Scavenge, Crankcase & Air Line](https://chartandkeel.com/topics/engine-fires-explosions): A hands-on guide to engine emergencies: starting-air readiness, crankcase-explosion mechanism with oil-mist response and staged restart, scavenge-fire causes with running and stopped actions plus full prevention, starting-air-line explosion defences, and engine-room crane safety with proof-load testing. #### Aux Engine & Boilers - [Aux Engine Valves, Valve Timing, Firing Order & Tappet Clearance](https://chartandkeel.com/topics/aux-valves-timing-tappet): A hands-on guide to four-stroke valve gear: inlet and exhaust valve maintenance with caged valves and roto-caps, Nimonic and Stellite materials with split collets, the burn-out feedback loop, valve-timing angles with 13° overlap, firing-order logic, lapping vs grinding, and cold/hot tappet setting by the rocking method with rocker lubrication checks. - [Aux Boilers, Liner Calibration, Rods & Fuel Pump Timing](https://chartandkeel.com/topics/aux-boiler-liner-fuel-pump): A hands-on guide to aux-engine heavy maintenance: water-tube and fire-tube boiler construction with operating data, fuel injector function and overhaul rhythm, liner wear modes with template calibration and renewal limits, connecting-rod and main-bearing clearance measurement, and jerk-pump overhaul with injection-timing control. #### Watchkeeping - [Engine Watchkeeping — Handover, Rounds & Work Safety](https://chartandkeel.com/topics/engine-watchkeeping-duties): A hands-on guide to engine-room watchkeeping in port: STCW composition rules, fitness bars and handover protocol, the ten-point brief with readiness checks, watch duties from rounds to records, hazardous-cargo and cargo watches, and work organisation with PPE, tools, signals and escape routes. #### Viva Voce - [Marine Machinery Oral Exam Questions: Coolers, Compressors, Pumps & Steering](https://chartandkeel.com/topics/viva-machinery-systems): Deduped oral-exam drills for coolers, air compressors, pumps and steering gear: throttle-side discipline, marine-growth dosing, filter-lore traps, leftover pump numbers and steering alarm logic — with signposts to the full lessons for everything else. - [Marine Engines & Lube Oil Oral Questions — No-Start, Scavenge, Rings](https://chartandkeel.com/topics/viva-engines-lubeoil): Deduped oral-exam drills for main-engine no-start and running faults, scavenge-fire and oil-mist scripts, ring-clearance logic and lube-oil leftover checks — purifier, reefer and batch-purification answers live in their full lessons, linked below. ### Marine Electrical Systems #### Fundamentals & Laws - [Electrical Fundamentals — Current, Power & Laws](https://chartandkeel.com/topics/electrical-fundamentals-laws): A clear guide to electrical basics: charge flow in conductors, the ten-point AC vs DC comparison, active vs reactive power with phase angle, and Ohm, Faraday and Kirchhoff laws with what each one conserves. - [Phase, RMS Value & Power Factor Explained](https://chartandkeel.com/topics/power-factor-rms-phase): A hands-on guide to AC measurement ideas: phase and 120° three-phase shift with in-phase meaning, RMS as peak-over-root-2 heating equivalent, power factor as cos phi with 0.8 shipboard and 1.0 best values, why near-1 current falls with lower I2R loss and stiffer volts, capacitor-bank correction, and why motors quote kW while alternators and transformers quote kVA. #### Switchboards & Protection - [Switchboards & Protection — MSB to Emergency Bus](https://chartandkeel.com/topics/msb-protection-bus-transfer): A clear guide to switchboard protection: MSB electrical and general safeties, preferential vs reverse-power trips with relay values, breaker families with shunt/UV/thermal units, ABT changeover logic, steering-feeder overload bands, and dead vs live MSB maintenance. - [Protection Chain — Contactors, Breakers, Overload vs Short Circuit](https://chartandkeel.com/topics/electrical-protection-discrimination): How relays sense and contactors switch, how ACB/MCCB/NFB breaker families divide the current bands, how overload differs from short circuit, and how discrimination, sequential starting and load sharing keep one fault from blacking out the ship. #### Motors & Starters - [Induction Motors — Principle, Faults & Testing](https://chartandkeel.com/topics/induction-motors-testing): A complete guide to marine motors: rotating-field principle with slip, single-phasing behaviour, the fail-to-start checklist from fuse to burnt winding, speed and direction control across induction, synchronous, wound-rotor and DC types, megger IR testing, fault tests and insulation classes. - [Motor Starters — Taming 8–10× Current](https://chartandkeel.com/topics/motor-starters-reduced-voltage): How reduced-voltage starting works: why locked rotors draw 6–10× current, star-delta maths with K1/K2/K3 interlocking, tapped auto-transformers, and thyristor soft starters that ramp voltage — never speed. - [Crane, Windlass & Deck Machinery — Brakes, Checks, Tests & Safeties](https://chartandkeel.com/topics/crane-deck-machinery-safeties): Engine-room crane and windlass in one place: fail-safe electromagnetic and thruster brakes, daily not-to-forget crane checks, windlass foundation-to-contactor checks with shaft earthing, hydraulic brake-holding test, and the electrical vs mechanical safety families. #### Transformers & Electronics - [Transformers, Diodes & Thyristors](https://chartandkeel.com/topics/transformers-electronics): A clear guide to static power conversion and semiconductor switches: mutual induction with power-constant trade, kVA rating logic, core and cooling families, auto and isolation variants, the diode family with Zener regulation, SCR power control, and the lambda sensor. #### Alternators & Parallel Running - [Brushless Alternator Working, Paralleling & AVR Explained](https://chartandkeel.com/topics/alternators-parallel-running): A hands-on guide to marine alternators: brushless two-machine construction with residual magnetism and self-excitation buildup, parts and PMS maintenance with air-gap and insulation checks, manual paralleling with synchroscope plus dark-lamp, bright-lamp and sequence lamp methods, why the incoming set runs slightly fast, AVR regulation loop with droop and V/Hz guards, and the three alternator safeties with reverse-power load-shift testing. - [Diesel Generator Starting Procedure & Alternator On-Load | Marine Guide](https://chartandkeel.com/topics/generator-operation-onload): A hands-on operating guide: local diesel-generator start with barring and pre-lube, auto and manual on-load with synchroscope discipline, slip significance with sync/async distinction, skewed shorted rotor bars, ACB behaviour with undervoltage interlock, 6-vs-12-o-clock reading, emergency changeover with link-breaker interlock and ESB loads, and the fail-to-start drill for an overhauled motor. #### Batteries & Supplies - [Marine Batteries: Lead-Acid vs NiCd, Charging & 440/220 V Distribution](https://chartandkeel.com/topics/batteries-supplies-distribution): A hands-on guide to shipboard stored and distributed power: cell vs battery, lead-acid discharge curve with 25.5/24/22 V marks and 8/10/20 h ratings, series vs parallel banks, quick vs trickle charging with controller watch, specific-gravity truth at 1280/1180, lead-acid vs alkaline comparison, gas and locker safety, and the 440/220 split with transformer and phase methods. #### Instruments & Safety Systems - [Instruments & Safety Systems](https://chartandkeel.com/topics/instruments-safety-ship-systems): How shipboard measurement and protection work: megger IR testing with the 500 V rule, thermocouple effects with E/J/K types, earth-fault alarm and tracing, smoke and heat detectors, the Ex-d/e/p/i hazardous-area family, battery-room hydrogen and spark-proof lighting, and shock limits with safe-working and rescue practice. #### Electrical Oral Questions - [Marine Electrical Oral Exam Questions with Answers — Function 5](https://chartandkeel.com/topics/electrical-viva-bank): Rapid-fire oral exam preparation across fundamentals, switchboards, motors, alternators, batteries, instruments and safety systems — each answer mechanism-first with shipboard values, plus pointers to the full emergency-generator, paralleling-lamp and fail-to-start lessons. ## Complete Text Feed - [Full Technical Text Feed](https://chartandkeel.com/llms-full.txt): Complete key takeaways and exam-ready principles for every topic in the repository.