Directory & Index 253 Topics 18 3D Models

Curriculum Directory & Sitemap

A complete, structured visual directory of all maritime modules, thematic series, topics, and interactive 3D ship structures. Use the filter below to quickly find any system or topic.

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Ship Construction & Naval Architecture Safety Marine Propulsion & Diesel Engines Auxiliary Machinery & Shipboard Systems Marine Electrical Systems 3D Lab Models Feeds & Tools

Ship Construction & Naval Architecture

Fundamental principles of ship design, equilibrium, static and dynamic stability, stresses, and structural integrity.

18 Topics Module Hub

01 Ship Types, Hull Form and the Parts of a Ship The cargo ship types an examiner asks for by name, then the hull form and the plating, strakes and deck parts that name every piece of the hull. Beginner 22 min read

02 Principal Dimensions and Ship Reference Points The coordinate system every calculation is built on: perpendiculars, moulded against extreme dimensions, and the four form coefficients that describe how fine the hull is. Beginner 7 min read

03 Ship Hydrostatics: Buoyancy, Displacement and Trim Why the ship floats and how much water she accounts for — Archimedes, the displacement triangle, tonnes per centimetre and the trim she takes when a weight moves. Intermediate 18 min read

04 Ship Stability: GM, Righting Levers and Free Surface Why the ship comes back upright — the points, the lever, the GZ curve, and every way that curve fails, from a negative GM to pocketing in a slack tank. Advanced 35 min read

05 Ship Stresses and Longitudinal Hull Strength What the sea does to the structure: shear and bending moment, hogging and sagging, racking and torsion, and the section modulus of the midship section that answers them. Advanced 24 min read

06 Shipbuilding Materials, Welding and Weld Defects What the structure is made of and how the pieces are fastened — mild and high tensile steel, aluminium, the sections used as stiffeners, and the NDT that finds what a weld hid. Intermediate 28 min read

07 Double Bottom Structure and Bottom Framing The foundation of the ship: transverse against longitudinal framing, then the floors, girders, tank top and keels that make the bottom the most heavily worked part of the hull. Intermediate 30 min read

08 Ship Bulkheads: Watertight, Corrugated and Fire How the hull is divided and what the division buys — flooding, fire containment and transverse strength, from the collision bulkhead forward to the fire class boundaries aft. Intermediate 32 min read

09 Fore End Structure: Panting, Pounding and the Stem The end that meets the sea first: the panting and pounding arrangements in the fore peak, the bow forms from raked stem to bulbous bow, and the ground tackle hung on it. Intermediate 34 min read

10 Aft End Structure: Stern Frame and Shafting The stern that carries the drive: stern form, the stern frames that hold the propeller and rudder, the stern tube and shafting, and the roll damping hung on the bilge. Intermediate 30 min read

11 Marine Propeller, Rudder and Steering Gear How the ship is driven and turned: pitch, slip and cavitation, the rudder and its stock and bearings, the steering gear behind it, and the trials that prove the whole arrangement. Advanced 38 min read

12 Decks, Openings and Watertight Closing Appliances Every hole cut through the deck is a hole in the watertight envelope — how hatch covers, doors, ports and freeing ports close it again, and how each closure is proved. Intermediate 32 min read

13 Midship Sections Compared by Type of Ship The same structural vocabulary arranged differently because the cargo is different — general cargo, bulk, tanker, LNG, container, Ro-Ro and passenger midships side by side. Intermediate 20 min read

14 Offshore Vessels, Rigs and Dynamic Positioning Hulls that earn their keep without going anywhere — the exploration, support and construction vessels of the offshore fleet, and the DP system that holds them over a well. Intermediate 9 min read

15 Ship Resistance, Hull Form and Propulsion What it costs to push a hull through water: frictional and wave-making resistance, the flow that causes them, and the powering numbers a designer works to. Intermediate 8 min read

16 Load Line, Freeboard and Tonnage Measurement The legal limit on draught: the marks on the side, the survey that keeps them valid, and the freeboard and tonnage figures behind the certificate. Intermediate 13 min read

17 Shipyard Practice: How a Ship Is Built and Launched From a signed contract and an empty berth to a launched and trialled ship: steel preparation, sub-assembly, block erection, outfit, the surveyor, the launch and the trials. Beginner 10 min read

18 Ship Classification, Surveys and Drydocking Who certifies the structure and what they do to it at intervals — the classification societies, the cycle of periodic surveys, and the drydock where the worst of it happens. Intermediate 17 min read

SOLAS & MARPOL

Safety

Maritime safety and pollution-prevention conventions — SOLAS, STCW and MARPOL — covering certificates, records, emergency procedures and Port State Control readiness.

54 Topics Module Hub

MARPOL

Pollution-prevention rules seafarers must know cold: MARPOL Annexes I–VI — oil, chemicals, packaged goods, sewage, garbage and air emissions — with discharge criteria, record books and PSC checks.

8 Topics →

01 MARPOL 73/78: The Convention & Its Six Annexes The international convention for marine pollution — what it covers, its six annexes, technical discharge criteria, and statutory enforcement. Beginner 9 min read

02 MARPOL Annex I — Prevention of Pollution by Oil IOPP, the 15 ppm OWS, discharge criteria, the Oil Record Book Parts 1 & 2, SOPEP and the ten special areas. Intermediate 10 min read

03 MARPOL Annex II — Noxious Liquid Substances in Bulk Chemical tanker categorisation (X, Y, Z, OS), stripping limits, mandatory prewash, underwater discharge, and P&A Manual compliance. Intermediate 10 min read

04 MARPOL Annex III — Harmful Substances in Packaged Form The IMDG Code, nine dangerous goods classes, UN packaging standards, marine pollutant markings, stowage segregation, and hold bilge isolation. Intermediate 10 min read

05 MARPOL Annex IV — Prevention of Pollution by Sewage from Ships Biological Sewage Treatment Plants (MEPC.227(64)), 3 NM / 12 NM discharge criteria, standard flange CAD, and Baltic Sea nutrient removal. Intermediate 9 min read

06 MARPOL Annex V — Prevention of Pollution by Garbage from Ships Universal plastics ban, 25 mm food comminution, 3 NM / 12 NM distance matrix, color-coded stations, and GRB Parts I & II. Intermediate 9 min read

07 MARPOL Annex VI — Air Pollution: SOx, NOx & Exhaust Gas Cleaning SOx limits (0.50% / 0.10%), EGCS scrubbers, Tier I/II/III NOx curves, SCR urea reactors, and Bunker Delivery Note sampling. Intermediate 11 min read

08 MARPOL Annex VI — Emission Reduction, EEDI, EEXI & CII In-engine NOx reduction (EGR, slide valves), the NOx Technical File, EEDI design indices, EEXI power limitation (EPL), and CII ratings. Advanced 11 min read

SOLAS

Safety-of-life-at-sea rules in exam order: SOLAS chapters on construction, life-saving, fire protection, navigation and cargoes, plus the ISM and ISPS codes, certificates and surveys.

13 Topics →

01 SOLAS Chapter IX — ISM Code & Safety Management Systems Statutory framework of the ISM Code, Document of Compliance (DOC), Safety Management Certificate (SMC), DPA direct access, and Major Non-Conformity handling. Intermediate 15 min read

02 SOLAS Chapter XI — ISPS Code & Maritime Security Special measures for maritime safety and security, permanent IMO hull markings, the 3 ISPS security levels, citadel hardening, and covert SSAS telemetry. Intermediate 15 min read

03 SOLAS Chapter III — Life-Saving Appliances & Arrangements The LSA Code categories: lifebuoys, life jackets, immersion suits, pyrotechnics, SART, EPIRB, GMDSS, EEBD and SCABA. Intermediate 11 min read

04 SOLAS Chapter V — Safety of Navigation (AIS, LRIT & VDR) Carriage requirements and the three key fittings: the Automatic Identification System, Long-Range Identification and Tracking, and the Voyage Data Recorder. Intermediate 10 min read

05 SOLAS Chapter II-2 — Fire Protection, Detection & Extinction The fire triangle, classes of fire, portable and fixed systems, detectors, fire main, inert gas, fire plan and muster list. Intermediate 11 min read

06 SOLAS Chapter VII — Carriage of Dangerous Goods & IMDG Code Statutory structure of Parts A–D, IMDG Code two-volume framework, 9 hazard classes, UN package testing, and container segregation geometry. Intermediate 15 min read

07 SOLAS Chapter XII — Additional Safety Measures for Bulk Carriers Statutory structural standards for holds, corrugated transverse bulkhead strength, 0.5m/2.0m water ingress detection, and ESP close-up surveys. Advanced 15 min read

08 SOLAS Chapter II-1 — Construction: Subdivision, Stability, Machinery & Electrical The flood boundary rules: watertight subdivision, damage stability, permeability, the margin line, and essential machinery and electrical supplies. Advanced 10 min read

09 SOLAS Chapter VI — Carriage of Cargoes & Oil Fuels Statutory cargo declarations, IMSBC Code groups, liquefaction soil mechanics, Grain Code stability criteria, and Cargo Securing Manual architecture. Intermediate 15 min read

10 SOLAS Chapter IV — Radio Communications (GMDSS) The Global Maritime Distress and Safety System: sea areas A1–A4, functional requirements, radio equipment and reserve power. Intermediate 10 min read

11 SOLAS Chapter VIII — Nuclear Ships & Reactor Safety Statutory reactor approval, Pressurized Water Reactor (PWR) marine P&ID, Safety Assessment (NSSS), 12-month certification, and Port State special control. Advanced 15 min read

12 SOLAS Chapter X — Safety Measures for High-Speed Craft (HSC Code) Dynamic Froude displacement criteria, 1994 vs 2000 HSC Codes, Permit to Operate (PTO), Marine Evacuation Systems (MES), and Category A/B fire redundancy. Advanced 15 min read

13 SOLAS Chapters XIII & XIV — Verification of Compliance & Polar Code How IMO audits flag states, and the Polar Code safety net for ships trading in polar waters. Intermediate 8 min read

General

Day-to-day seamanship and paperwork: ship certificates, load line and tonnage, dry-docking, bunkering, audits vs surveys, and emergency equipment checks.

21 Topics →

01 Major Certificates & Documents to Carry On Board The SOLAS, MARPOL, Load Line, Tonnage, STCW, ILO and liability certificates and documents a surveyor expects you to name. Intermediate 9 min read

02 The Saturday Routine: Planned Maintenance Checks The weekly, fortnightly and monthly emergency and safety-equipment checks every engineer performs, and who is responsible for each. Beginner 7 min read

03 Dry-Docking: Preparation, Procedure & Survey What the engineer prepares months, days and hours before docking, what happens on the dock, and the survey and follow-up work. Intermediate 8 min read

04 Bunkering & Oil Transfer: Precautions & Procedures The scuppers, hoses, signals and tank-changeover discipline that prevent a spill and a bad fuel problem. Intermediate 7 min read

05 Conditions of Assignment of Freeboard The construction, openings, vents, scuppers, side scuttles, freeing ports and crew protection that must be met before a freeboard is assigned. Advanced 9 min read

06 Why Oil Tankers Have Less Freeboard Fewer openings, more subdivision, low tank permeability, lighter cargo and powerful pumping — the reasons a tanker needs less reserve buoyancy. Intermediate 6 min read

07 Safety on Oxygen & Acetylene Bottles Flashback arrestors, colour coding, right/left-hand threads and separate storage — the rules for oxy-acetylene equipment on board. Beginner 6 min read

08 Tonnage Measurement: Gross & Net Tonnage The Tonnage Convention 1969, the GT and NT formulas, the deduction spaces and why tonnage drives regulation and port costs. Advanced 8 min read

09 Load Line: Marks, Letters & Conventions The Plimsoll mark, TF/F/T/S/W/WNA letters, how the marks are derived, the Load Line Convention and why the mark is on both sides. Intermediate 8 min read

10 Loadicator / Loading Computer The onboard loading computer that proves adequate stability, allowable stresses and draughts before the ship sails. Intermediate 6 min read

11 Difference Between Audit and Survey A survey checks the hardware; an audit checks the system, procedures and records behind it. Beginner 5 min read

12 Emergency Generator: Testing & Requirements Two starting modes, the weekly/monthly test schedule, battery/hydraulic/automatic start procedures and the stored-energy rules. Intermediate 9 min read

13 MGPS — Marine Growth Prevention / Anti-Fouling System How copper and aluminium anodes use electrolysis to stop marine growth and corrosion in the sea water cooling system. Intermediate 7 min read

14 Quick Closing Valve: Construction & Working The remote spring-loaded valve that shuts off fuel in an emergency, and how it differs from a pressure relief valve. Intermediate 6 min read

15 How to Measure the Depth of the Ship (Echo Sounder) The echo sounder measures depth from the time a sound wave takes to travel to the seabed and back: S = V × T. Beginner 6 min read

16 New Amendments (1 January 2013): SOLAS & MARPOL The 2013 amendments: lifeboat on-load release hooks, EEDI/SEEMP energy efficiency, the US Caribbean ECA and the revised garbage rules. Intermediate 8 min read

17 Ship Accommodation, Midship Section & Container Stowage Knowing your ship's particulars, the midship section, TEU/FEU container sizes and tare, net and gross weights. Beginner 7 min read

18 Rudder: Construction, Types & Support How a rudder is built, the balanced/semi-balanced/spade types, and how it is supported and prevented from lifting. Intermediate 8 min read

19 Fuel Consumption & Speed Relationship Why fuel burn climbs with the cube of speed — specific fuel consumption, the fuel coefficient, and daily consumption. Intermediate 7 min read

20 Maritime Codes & Conventions: The Complete List The codes and conventions every marine engineer must name — and what each abbreviation actually stands for. Beginner 7 min read

21 STCW: The Convention & Its Eight Chapters What STCW stands for and the eight chapters that set the training, certification and watchkeeping standard for seafarers. Beginner 5 min read

Life Saving Appliances

Every life-saving appliance and how surveyors test you on it: personal LSA, distress signals, liferafts, lifeboats and launching — with SOLAS rules and maintenance intervals.

5 Topics →

01 LSA Chapter 1: Categories of LSA & Personal Life-Saving Appliances The LSA categories, lifebuoys, life jackets, immersion suits, anti-exposure suits and thermal protective aids — with the SOLAS numbers surveyors ask for. Intermediate 8 min read

02 LSA Chapter 2: Pyrotechnics, VHF, SART, EPIRB & GMDSS Distress signalling equipment — rocket flares, hand flares, buoyant smoke, two-way VHF, SART, EPIRB and GMDSS — with every SOLAS number the surveyor will ask for. Intermediate 9 min read

03 LSA Chapter 3: Line Throwing, EEBD & SCABA General LSA — the line throwing apparatus, the emergency escape breathing device and the self-contained breathing apparatus — with the SOLAS figures surveyors test. Intermediate 13 min read

04 LSA Chapter 4: Life Rafts — Capacity, Equipment & Launching Inflatable and rigid life rafts: CO2 inflation, 25 items of equipment, painter strengths, manual, auto-HRU and davit launching — with the SOLAS numbers surveyors ask for. Intermediate 13 min read

05 LSA Chapter 5: Lifeboats — Types, Engine, Davit & Drills Open, enclosed and freefall lifeboats: compression-ignition engines, post-2014 hooks, 30 items of equipment, gravity davits and weekly/monthly maintenance. Advanced 13 min read

Fire Safety

The complete shipboard fire-fighting syllabus: fire classes and extinguishers, detectors, CO2, sprinklers, fire main, foam, inert gas, fire plans and muster lists.

7 Topics →

01 Classes of Fire & Portable Fire Extinguishers on Ships Fire classes A to D plus electrical, the fire tetrahedron, SOLAS portable-extinguisher rules, and water, foam, CO2 and DCP types — with the pressures, weights and throw ranges surveyors ask for. Intermediate 12 min read

02 Ship Fire Detectors: Heat, Smoke & Flame Types Heat, smoke and flame detectors: where each is fitted, how each works, and the coverage areas, heights and spacings surveyors test you on. Intermediate 10 min read

03 CO2 Fixed Fire-Fighting System on Ships The CO2 fixed system end to end: bottles and regulations, the CO2 room and safeties, quantity calculation and maintenance, and engine-room and purifier fire actions. Advanced 12 min read

04 Ship Sprinkler & Hypermist (Water Mist) Systems Sprinkler regulation, bulb colours and the full 9-step test — plus hypermist water-mist for machinery spaces, with every pressure and flow. Intermediate 12 min read

05 Ship Fire Main & Emergency Fire Pump System The fire main backbone, main and emergency pumps, hoses, nozzles, hydrant pressures and valves — every figure in one place. Intermediate 12 min read

06 Deck Foam & Inert Gas (IG) Systems on Tankers Foam blanket types and deck-foam rates plus inert gas — flammability limits, scrubber, blowers, deck seal and working flow. Advanced 12 min read

07 Fire Control Plan, Muster List & Flooding Response Where the fire plan lives, what the muster list must contain under Reg.37, and the engine-room flooding drill — in surveyor-ready words. Beginner 10 min read

Marine Propulsion

Marine Propulsion & Diesel Engines

MEO Class 4 Motor — theoretical cycles, two-stroke and four-stroke construction, fuel injection, turbocharging, indicator diagrams, engine operation and troubleshooting.

28 Topics Module Hub

Engine Basics & Cycles

Engine fundamentals first: Otto, Diesel and dual cycles, engine terminology, and two-stroke vs four-stroke differences — the base every Motor answer builds on.

4 Topics →

01 Theoretical Cycles — Otto, Diesel & Dual Combustion Three ideal heat-addition stories on one p-V plot — and why real marine diesels follow the dual one. Beginner 6 min read

02 Diesel Engine Basics — Terms, Strokes & Timing Stroke, swept volume, compression ratio — then how four strokes collapse into two. Beginner 7 min read

03 Diesel Engine Types — 2-Stroke Crosshead vs 4-Stroke Trunk Five ways to classify any diesel, then the full head-to-head that decides propulsion vs power generation. Beginner 8 min read

04 Engine Nomenclature — Decode MAN, Sulzer, Daihatsu & Spec Sheets Every letter on the engine plate is a dimension, a duty or a revision — read the code and you already know the engine. Beginner 7 min read

Two-Stroke Construction

Inside the big two-stroke: engine structure, crankshaft types, main/guide/thrust bearings, chain drive and charge-air coolers — with inspection and failure points.

6 Topics →

01 Two-Stroke Structure — Frame, Tie Rods, Liner, Piston & Crosshead Eight parts from bedplate to block, tie rods holding the sandwich in compression, each shaped by the forces it must survive. Beginner 11 min read

02 Marine Crankshafts — Builds, Bedplate, Chocks & Alignment Why a 300-tonne shaft comes in pieces, what steel it sleeps on, and the fourteen reasons alignment fails. Intermediate 10 min read

03 Engine Bearings — Renewal, Crosshead to Thrust Block How oscillating bearings keep an oil film, how a main bearing is renewed in 22 steps, and how tilting pads carry the propeller. Intermediate 11 min read

04 Chain Drive & Camshaft — Timing Transmission What the chain drives, how rollers and pins wear, and the inspection that catches a jumping chain early. Beginner 6 min read

05 Charge Air Cooler — Density, Discipline & Fouling Why cooled air makes more power, the 55°C ceiling and 20°C floor, and the checks that catch fouling first. Intermediate 7 min read

06 Stuffing Box — Sealing Rings, Clearances & Running-In Three ring sets guard the border between scavenge air and crankcase oil — and three clearances decide whether the piston seals or the engine breathes fire. Intermediate 9 min read

Fuel Injection

How fuel gets injected at the right moment: valve-controlled and helix fuel pumps, mechanical and electronic VIT, and injection timing.

2 Topics →

01 Fuel Pumps — Jerk, VIT & Common Rail How 200–400 bar is metered by valves, helixes and moving barrels — and why timing shifts with load. Intermediate 9 min read

02 Fuel Injectors — Atomisation, 7 Tests & Overhaul How 200–400 bar becomes a burning mist — and the seven bench tests that condemn a valve before it burns a piston. Intermediate 10 min read

Electronic Control

Camless marine diesel engines: MAN ME and Sulzer RT-flex hydraulic power supply, servo-oil actuation, electronic fuel injection (ELFI) and electronic exhaust valves (ELVA).

1 Topic →

01 Electronic Engines — Camless Fuel, Exhaust & Start-Air Control No camshaft, no chain, no timing gears — software decides when fuel fires, valves open and air starts, and pressurised lube oil does the muscle work. Advanced 10 min read

Four-Stroke Engines

Auxiliary four-stroke engines: layout, cylinder-head valves, fuel injection, trunk-piston lubrication and the checks that keep them running.

1 Topic →

01 Four-Stroke Aux Engines — Layout to Lubrication Why medium-speed trunk engines rule auxiliary power, and how the MAN vee masters residual fuel. Intermediate 9 min read

Gas Turbines

Rotating power without pistons: gas-turbine working, performance, steam-vs-gas comparison and the auxiliaries that support them.

1 Topic →

01 Gas Turbines — Continuous Combustion at Sea How compressor, combustor and turbine share one shaft, why 60% of the power never leaves, and where GTs fit on ships. Intermediate 8 min read

Performance & Indication

Proving the engine makes its power: indicator cards, mean effective pressure, efficiencies and the running adjustments that fix them.

1 Topic →

01 Indicator Diagrams & Engine Performance How a pencil, a drum and a spring turn cylinder pressure into power, balance and fault-finding. Intermediate 9 min read

Engine Operation

Starting, reversing, manoeuvring and stopping: two-stroke and four-stroke operation with the alarms and interlocks that guard each step.

4 Topics →

01 Two-Stroke Start Preparation — the Two-Hour Notice Air, oil, water and fuel proved in order, the engine barred and blown through, clearance in hand. Beginner 8 min read

02 Starting & Reversing the Two-Stroke How 30 bar becomes rotation, the interlocks that guard it, and the three ways to run astern. Intermediate 9 min read

03 Manoeuvring, Port Ops & Engine Vigilance Stop/start/run signals, full-away and finished-with-engines drills, fuel changeover, and reading every abnormality. Intermediate 10 min read

04 Four-Stroke Operation — Alternator Duty What trips a generator engine, the start-to-load drill, and the gearbox watch that comes with it. Beginner 8 min read

Lubrication & Fuel Systems

Oil and fuel readiness: lube-oil system and purification plus fuel preparation and changeover — the systems behind every reliable running hour.

1 Topic →

01 Lube Oil & Fuel Systems — Properties, Treatment & Changeover Four jobs one oil does, the fuel enemies written in the bunker analysis, and why heavy oil never sleeps. Beginner 10 min read

Safety & Troubles

When engines misbehave: protections, performance curves, starting and running faults, and the emergencies — with causes and actions.

4 Topics →

01 Safe Operation — Vigilance & Human Error Thirteen watch checks that catch failure early, six overhaul mistakes that cause it, and the four hazards behind both. Beginner 7 min read

02 Engine Protections, Vibration Watch & Performance Curves Alarm, slow-down, shut-down, interlock — plus the barred-speed band that keeps resonance from cracking steel. Intermediate 10 min read

03 Starting & Running Troubles — No-Start to Knock Dead on air, slow on air, silent on fuel, smoking, sagging, shaking, knocking, overheating — each with its hunt list. Intermediate 9 min read

04 Explosion Physics — Mist, Doors & Detectors How 50 mg of oil per litre becomes a 30-atmosphere shock wave — and the three devices that stand in its way. Advanced 9 min read

Governor & Scavenging

Speed control and breathing: governors, pulse vs constant-pressure turbocharging, surging and the washing routines that restore air flow.

3 Topics →

01 Governors — Flyweights, Hydraulics & Dead Band How centrifugal force versus a spring holds engine speed — and the deliberate silence that stops the hunting. Intermediate 9 min read

02 Scavenging, Turbocharging & Surge How a cylinder breathes in a quarter of the time, why pulse and constant pressure split the fleet, and what surging sounds like. Intermediate 9 min read

03 Engine Controls & Measurement — Bridge to Shaft How control moves between stations, how torque is weighed electrically, and how computers draw cards. Intermediate 7 min read

Auxiliary Machinery

Auxiliary Machinery & Shipboard Systems

MEO Class 4 MEP — shaft seals, heat exchangers, air compressors, pumps, steering gear, refrigeration, purifiers, pipelines, valves, FWG, oily water separators, sewage treatment plants, engine maintenance and watchkeeping.

141 Topics Module Hub

Shaft Seals & Packing

Keeping oil in and seawater out: oil control rings, wiper rings, gland packing, mechanical seals and labyrinth seals — with overhaul clearances.

1 Topic →

01 Shaft Seals & Packing — Wiper Rings, Mechanical & Labyrinth Seals Where seals sit on board, how wiper rings control oil on the piston rod, and how clearance stages seal a turbocharger without contact. Beginner 8 min read

Heat Exchangers

Shell-and-tube vs plate coolers: construction, cleaning, back-flushing and leak detection — plus what to do when temperatures creep up.

2 Topics →

01 Shell & Tube Heat Exchangers — Cleaning, Retubing & Leak Detection Heat crosses from hot fluid to cold through the tube wall — fouling, scale and galvanic attack all fight that crossing, and every routine exists to keep the wall clean, sealed and protected. Intermediate 10 min read

02 Plate Heat Exchangers — Cleaning, Tightening & Gaskets Thin corrugated plates force turbulent flow so heat crosses fast and deposits get swept away — but the pack is a measured assembly where one uneven pull on the tie-bolts wrecks plates for good. Intermediate 9 min read

Air Compressors

15 Topics →

01 What Is an Air Compressor and How Does It Work? Why a compressor is not a pump, why 31 bar absolute is not 30 bar gauge, and why a stopped compressor is still dangerous. Beginner 22 min read

02 Pressure, Units and Pressure Ratios in Air Compressors Gauge or absolute: one word decides whether your pressure ratio is right. Beginner 22 min read

03 Gas Laws, Air Properties and Moisture in Compressors Why 40 degrees is not twice 20 degrees, and where the water in your air receiver comes from. Beginner 22 min read

04 Multistage Compression and Intercooling in Air Compressors Sixteen to one in a single stage, or four to one twice: the same air, less work and cooler valves. Intermediate 19 min read

05 The Reciprocating Compressor Cycle Explained Four events, not three: the clearance re-expansion nobody watches is the one that costs capacity. Intermediate 21 min read

06 Volumetric Efficiency in Air Compressors Explained Eighty-two out of a hundred: where the missing eighteen cubic metres went. Intermediate 19 min read

07 Air Compressor Capacity, Power and Specific Energy The power bill does not follow capacity: specific power is the number that moves. Intermediate 18 min read

08 Compressor Pressure-Volume Diagrams and Indicator Cards The shape of the loop tells you which valve failed before you touch a spanner. Intermediate 15 min read

09 Positive-Displacement and Dynamic Compressors Compared Trapped and squeezed, or accelerated and diffused: two families and two failure modes. Intermediate 17 min read

10 Reciprocating Compressor Classifications and Arrangements Single or double acting, air or water cooled, V or opposed: the name tells you how it will fail. Advanced 15 min read

11 Air Compressor Selection and Application on Ships Start with the duty and not the catalogue, because most bad compressor choices were made before the enquiry was written. Advanced 22 min read

12 Main Reciprocating Air Compressor Construction Two machines on one frame: a running gear that turns rotation into reciprocation, and a gas end that squeezes air. Advanced 19 min read

13 Crankshaft, Connecting Rod and Crosshead in Compressors Gas forces push and inertia forces pull, so the frame must survive both and the balance decides the vibration. Advanced 17 min read

14 Compressor Pistons, Piston Rings and Rider Rings The rings seal and the rider rings carry, so confuse the two and you will keep replacing the wrong part. Advanced 16 min read

15 Piston-Rod Packing and Oil Scraper in Compressors Packing leaks by design and seals by pressure, while the scraper keeps the oil where it belongs. Advanced 16 min read

Steering Gear

The whole steering gear, from the SOLAS rules to the rudder bearings: ram and vane gears, variable delivery pumps, telemotor control, emergency steering, the test routine, maintenance and failure protection.

12 Topics →

01 Steering Gear Rules — Main and Auxiliary Gear, Performance and Tests What the rules demand of a steering gear, because the rules are what the machinery is designed around. Beginner 18 min read

02 Rudder, Stock and Carrier Bearing — Weardown, Rudder Drop and Pintle Clearance The parts of the steering system that cannot be duplicated — the rudder, the rudder stock and the bearing that carries their weight — and the way their condition is measured. Intermediate 14 min read

03 Tiller and Rapson Slide — Mechanical Advantage, Clearances and Fastenings The mechanism that turns the straight-line push of the rams into the rotation of the rudder stock. Intermediate 11 min read

04 Ram Type Steering Gear — Two and Four Rams, Valve Chests and Change-Over The ram type gear as a machine — the cylinders and rams, the valve chest, the hydraulic circuit, and the way the gear can be run on two cylinders or four. Intermediate 16 min read

05 Variable Delivery Pumps — Hele-Shaw, V.S.G., Sunstrand and Hastie The pumps that drive an electro-hydraulic steering gear. Advanced 20 min read

06 Rotary Vane Steering Gear — Principle, Pressure Limit and Ram Comparison The vane type gear, which does the same job as a two-ram gear by turning the rudder stock directly instead of pushing a tiller. Intermediate 13 min read

07 Steering Gear Control Systems — Telemotor, Hunting Gear and Floating Lever How an order given on the bridge becomes a rudder movement, and how the rudder is stopped at exactly the angle ordered. Advanced 45 min read

08 Emergency Steering — Changeover Pin, Hand Pump and the Three-Monthly Drill What happens when the normal control or the normal power fails. Intermediate 16 min read

09 Steering Gear Checks and Tests — Daily Rounds, the 12-Hour Test and Drills What the engineer actually does with a steering gear — the routine checks, the pre-departure test, the drills, and the safe isolation procedure for working on it. Beginner 19 min read

10 Steering Gear Maintenance — Rudder Drop, Bearing Clearances and Overhaul The work done on the steering gear itself — the measurements taken, the rudder lifted, the cones repaired, the system charged, the seals renewed. Intermediate 18 min read

11 Steering Gear Failures — Relief Valves, Split Circuits and the Alarm Chain The failures a steering gear actually suffers, what has been done about them, and how to read the symptoms when something goes wrong. Advanced 21 min read

12 Steering Gear Safety — Stored Energy, Isolation and Enclosed Space Entry The hazards that are specific to a steering gear, and the working practices that go with them. Intermediate 15 min read

Refrigeration Plant

The whole refrigeration plant from cycle to overhaul: refrigerants, compressor, condenser and evaporator, expansion valves, controls and safeties, oil management, watchkeeping, troubleshooting, air conditioning and safety.

12 Topics →

01 Refrigeration Principles and the Vapour Compression Cycle One idea runs the whole plant: a fluid changes state at a temperature fixed by its pressure. Intermediate 24 min read

02 Refrigerants On a ship the refrigerant is both the working fluid and the main hazard. Intermediate 22 min read

03 The Refrigeration Compressor The only major moving component in the circuit — where most of the maintenance and nearly all of the noise lives. Advanced 30 min read

04 Condensers, Evaporators and Heat Transfer Most "the plant is not cooling" complaints are heat exchanger complaints — a dirty condenser, a frosted evaporator, an air-locked coil. Advanced 32 min read

05 Expansion Valves and Liquid Level Control The device most often blamed and most often mis-adjusted on a ship — every type in use, and the diagnostic logic for each. Advanced 34 min read

06 Controls, Safety Devices and Circuit Components The compressor and the four main components do the work; everything here decides when they do it and what stops them when something is wrong. Advanced 40 min read

07 Oil in Refrigerant Systems The component most often neglected and the one that causes the most subtle faults — oil that stays in the compressor is doing its job. Advanced 30 min read

08 System Operation, Watchkeeping and Shipboard Procedures Automatic plant still needs a watchkeeper — the log sheet is what turns a running machine into a monitored one. Intermediate 26 min read

09 Troubleshooting and Fault-Finding First decide whether the load changed or the plant changed — that single question splits every refrigeration fault in two. Advanced 30 min read

10 Air Conditioning Same plant, different objective — the target is human comfort, so humidity matters as much as temperature. Intermediate 26 min read

11 Maintenance, Overhaul, Inspection and Repair Planned work, scheduled and recorded — the object is to prevent the fault, not to find it. Advanced 28 min read

12 Safety and Emergencies Every refrigerant is a hazard, but the hazard is different for each one — know the fluid before you open anything. Intermediate 24 min read

Purifiers & Centrifuges

Clean oil, happy engine: purifier bowl parts, purifier vs clarifier, starting and stopping sequence, and the separation faults that dirty the oil.

15 Topics →

01 The Purpose of a Marine Oil Purifier Why is a purifier fitted in a marine fuel-oil or lubricating-oil system? Beginner 13 min read

02 Basic Separation Principles in a Marine Purifier How does a purifier separate oil, water, and solids? Beginner 17 min read

03 Liquid Properties That Control Purifier Performance How do density, specific gravity, viscosity, temperature, and feed rate affect purifier operation? Beginner 16 min read

04 Main Components of a Marine Oil Purifier What does each purifier component do, and how do the parts work together? Intermediate 20 min read

05 Purifier Bowl Construction and Disc-Stack Assembly How is the purifier bowl built, and why is the disc stack assembled so precisely? Intermediate 17 min read

06 Three-Phase Flow Through the Purifier Bowl How do oil, water, and solids travel through the bowl from inlet to separate outlets? Intermediate 15 min read

07 Purifier Oil-Water Interface and Gravity Disc How is the oil-water boundary positioned, and how is the correct gravity disc selected? Intermediate 15 min read

08 Factors That Control Purifier Separation Efficiency What makes a purifier separate faster and produce cleaner oil? Intermediate 15 min read

09 Purifier Start-Up Sequence How is a purifier safely started, sealed, heated, and brought into oil feed? Intermediate 15 min read

10 Purifier Normal Operation and Monitoring How do you know that a purifier is running normally? Intermediate 15 min read

11 Purifier Automatic Sludge Discharge and Bowl Cleaning How does a self-cleaning purifier remove accumulated sludge and restore normal operation? Intermediate 14 min read

12 Purifier Shutdown and Emergency Stop How do you stop a purifier safely during normal operation and during an emergency? Advanced 15 min read

13 Purifier Maintenance, Cleaning, and Inspection How is a high-speed self-cleaning purifier cleaned, inspected, preserved, and returned to service safely? Advanced 16 min read

14 Purifier Troubleshooting and Fault Diagnosis How can purifier symptoms be converted into safe, logical fault diagnosis? Advanced 17 min read

15 Purifier Automatic Control and Instrumentation How do the automatic panel, timers, solenoid valves, detectors, and displays coordinate purifier operation? Advanced 16 min read

Pipelines & Valves

The ship’s plumbing: bilge, ballast and bunkering lines, water hammer, globe/gate/butterfly valves and sea-chest care — failures included.

4 Topics →

01 Ship Pipelines — Seawater, Bilge, Ballast & Fuel Systems What each system carries, where each one fails first, and the sounding pipe you must never leave open. Beginner 10 min read

02 Globe & Gate Valves — Overhaul, Seats & Testing How a globe throttles and a gate isolates, how to rebuild either without wrecking the seat, and the two tests that prove it. Intermediate 11 min read

03 Butterfly Valves & Sea Chest Filters How a quarter-turn disc seals, how to rebuild one without pinching the seat, and the changeover that keeps cooling alive. Beginner 8 min read

04 Pipe Corrosion, Water Hammer & Failure Response How each corrosion eats, why a cold steam line can explode, and the first five minutes after a burst. Intermediate 10 min read

Oily Water Separator

Bilge water to the 15 p.p.m. gate: MARPOL Annex I discharge rules, how separation works, pump and suction mode, inside the separator, the oil content monitor, the bilge system, the operating sequence, troubleshooting, maintenance, sludge disposal and safety.

12 Topics →

01 Why the Oily Water Separator Is Fitted Set out what the oily water separator is actually for, what the two international requirements are, and what the machine is made of. Beginner 4 min read

02 When You May Discharge — MARPOL Annex I Limits, Distances and Special Areas The legal conditions under which the overboard valve may be opened at all. Intermediate 6 min read

03 How Oily Water Separation Works — Gravity, Coalescence and Why Turbulence Ruins It The physics behind the separator, in enough depth to explain why the plant is built the way it is and why certain operating habits destroy its performance. Intermediate 4 min read

04 OWS Pump Selection and the Suction Mode — Why the Pump Decides the Result The single factor most often got wrong on board. Intermediate 5 min read

05 Inside the Oily Water Separator — Plates, Probes, Relief Valve and Siphon Breaker What the oily water separator actually looks like inside, how the flow path works, and what every fitting on the shell is for. Intermediate 8 min read

06 Oil Content Monitoring and the 15 ppm Trip — Optics, Fluorescence and Testing How the ship knows whether the water it is putting overboard is legal. Intermediate 6 min read

07 The Bilge System the Separator Serves The pipework and the discipline that feed the separator and, more importantly, the arrangements that let a ship deal with a flooded engine room. Beginner 7 min read

08 Operating the Oily Water Separator The complete operating sequence, from informing the bridge to handing the key back. Intermediate 4 min read

09 Troubleshooting the Oily Water Separator — Ten Faults, Cause by Cause A working diagnostic index for the oily water separator, the monitor and the bilge system that feeds it. Intermediate 5 min read

10 Maintenance of the Oily Water Separator — the Twelve Points and the Compliance Items The routine that keeps the separator capable of holding 15 p.p.m., and the checks that keep the installation legally compliant. Intermediate 3 min read

11 Oily Sludge and Its Disposal What happens to the oil the separator takes out. Intermediate 4 min read

12 Safety on the Oily Water Separator The hazards specific to this plant, and the controls that answer them. Intermediate 5 min read

Sewage Treatment Plant

Sewage at sea: what sewage is, aerobic versus anaerobic breakdown, MARPOL Annex IV discharge distances, the biological treatment plant, retention and zero-discharge systems, effluent quality, sludge disposal, troubleshooting, maintenance and safety.

10 Topics →

01 What Sewage Is — the Definition, the Daily Volumes, and Why It Must Be Treated Define the subject precisely, and establish why a ship spends money and space on treating something that could in principle be pumped over the side. Beginner 3 min read

02 Aerobic and Anaerobic Breakdown — Why the Colony Dies and How Long Recovery Takes The one distinction on which the whole subject turns. Beginner 5 min read

03 Where Sewage May Be Discharged — the 4 Mile and 12 Mile Rules Where sewage may be discharged, in what condition, and at what distance from land. Intermediate 3 min read

04 The Sewage Treatment Plant — Aeration, Settling and Chlorination The machine itself — its compartments, its flow path, its disinfection stage and its settings. Intermediate 9 min read

05 Retention, Holding and Zero-Discharge Systems — Holding Tanks, Vacuum Toilets and Elsan The arrangements that keep sewage on board rather than treating it. Intermediate 5 min read

06 Effluent Quality — BOD, Suspended Solids and Coliform Count The three tests that decide whether treated sewage is clean enough to discharge, what each one actually measures, and the numbers that go with them. Intermediate 5 min read

07 Sludge Disposal — Overboard at Sea, Sullage Tank, or Incinerator What to do with the solids a sewage plant produces. Intermediate 3 min read

08 Troubleshooting the Sewage Plant — Ten Faults, Cause by Cause A diagnostic index for the sewage plant, the holding tank arrangements and the sludge system. Intermediate 5 min read

09 Maintenance of the Sewage Plant — Desludging, Aeration and the Daily Checks The routine that keeps a sewage plant alive. Intermediate 3 min read

10 Safety on the Sewage Plant — Gas Hazards and Enclosed Space Entry The hazards specific to sewage treatment. Intermediate 5 min read

Workshop & Practicals

1 Topic →

01 Marine Workshop Practicals — Vernier, NDT, Heat Treatment, Threads & Changeovers The hands-on jobs examiners ask about: measure to a tenth of a millimetre, prove a crack with dye, harden without shattering, cut a thread that fits, and change over filters and sea chests without tripping the plant. Beginner 12 min read

FWG & Hydrophore

Fresh water at sea and pressure at the taps: fresh-water generator operation and hydrophore pressure-water systems with their faults.

2 Topics →

01 Fresh Water Generator — Vacuum Boiling, Operation & Faults How 92% vacuum lets engine waste heat boil seawater at 50 °C, and what high salinity or low output is telling you. Intermediate 12 min read

02 Hydrophore & Water Supply — Pressure on Demand How a trapped air pocket keeps every tap pressurised at every deck, and the tank discipline that keeps water safe to drink. Beginner 10 min read

Aux Engines

The whole auxiliary engine and its generator: structure and moving parts, valve gear and fuel injection, starting, governing and load sharing, cooling and lubrication, the alternator and switchboard, the emergency generator, operation, maintenance and safety.

13 Topics →

01 What the Auxiliary Engine Is — Why It Is a Four-Stroke Medium-Speed Machine Establish what the auxiliary engine is, what distinguishes it from the main propulsion engine, and why it is almost always a four-stroke medium-speed machine. Beginner 11 min read

02 The Diesel Generator Set — Bedding Down, Coupling and Driving the Alternator How the engine and the alternator are joined into one machine, how that machine is bedded down to the ship, and what the alternatives to a diesel generating set look like. Intermediate 11 min read

03 The Engine Structure — Bedplate, Frame, Crankshaft and Main Bearings The stationary parts of the auxiliary engine — the bedplate, the frame and cylinder block, the crankshaft and the main bearings. Intermediate 9 min read

04 The Moving Parts — Liner, Piston, Gudgeon Pin and Connecting Rod Wear The piston, the piston rings, the gudgeon pin, the connecting rod and the cylinder liner — the parts that take the combustion load, transmit it to the crankshaft, and wear out doing it. Intermediate 10 min read

05 The Valve Gear and Fuel Injection — Valves, Camshaft Drive, Pumps and Injectors How air gets into the cylinder, how the exhaust gets out, how the valves are operated, and how fuel is metered and injected. Advanced 19 min read

06 Starting the Engine — Air Start Valve, Distributor and the Four Interlocks How a stopped auxiliary engine is turned over and brought to firing speed, and what has to be true before the air is admitted. Intermediate 11 min read

07 Governing and Speed Control — Droop, Load Sharing and the Overspeed Trip How the auxiliary engine's speed is held constant as its load changes, and how two or more sets share load between them. Advanced 23 min read

08 Cooling, Lubrication and Fuel — Systems and the Tanks Checked Before Starting The three fluid systems that keep the auxiliary engine alive — the cooling water, the lubricating oil and the fuel. Intermediate 16 min read

09 The Alternator and Switchboard — AVR, Load Shedding and the Automatic Plant The engine has been described; this chapter describes what it turns and where the power goes. Intermediate 13 min read

10 The Emergency Generator — Location, Starting, Fuel and the Emergency Board The emergency generator is the ship's last line of electrical defence. Intermediate 9 min read

11 Operating the Plant — Preparing, Starting, Watchkeeping and Keeping Warm What an engineer actually does with an auxiliary engine — how it is prepared, started, watched and stopped, and how the automatic systems change that routine on an unmanned ship. Beginner 12 min read

12 Maintenance and Troubleshooting — Overhauls, Tappet Clearance and Reading a Fault The work that keeps an auxiliary engine reliable, and the reasoning that turns a symptom into a diagnosis. Intermediate 18 min read

13 Safety — Crankcase Explosion, Scavenge Fire and Starting Air Line Explosion The three hazards that are peculiar to a diesel engine and that have killed people — the crankcase explosion, the scavenge fire and the starting air line explosion — together with the devices and the practices that exist to prevent them. Intermediate 11 min read

Deck Machinery

The deck machinery volume: what the machinery has to do and how it is rated, electric and hydraulic drives, the anchor windlass, mooring equipment, cargo winches and derricks, deck cranes, hatch covers, lifeboat davits, maintenance and safety on deck.

11 Topics →

01 What Deck Machinery Has To Do — Duty, Rating and Control The deck is the one place on a ship where machinery is asked to stand idle for weeks and then work perfectly the moment it is wanted, in salt, weather and cold. Beginner 6 min read

02 Electric Drives for Deck Machinery — Motors, Converters and Stalling The electric drive is what most deck machinery uses, and the choice between the types of motor is decided almost entirely by two questions — how much torque is available at low speed, and what happens when the load overhauls the motor. Advanced 7 min read

03 Hydraulic Drives for Deck Machinery — Fluid, Pumps and Circuits Hydraulic power is the other half of the deck machinery story, and it is the drive of choice wherever the machinery is exposed, remote from the engine room, or sitting in a hazardous area. Advanced 10 min read

04 Anchor Handling and the Windlass — Duties, Brake and Slipping Clutch The anchor windlass is the piece of deck machinery whose failure has the most immediate consequences, because it is the machine that has to hold a ship off a lee shore. Intermediate 5 min read

05 Mooring Equipment — Winches, Capstans, Wire Rope and Tension Control Mooring is the duty that has changed most, from a job for a dozen men on the forecastle to a job for two men and a set of automatic winches. Intermediate 5 min read

06 Cargo Winches and Derricks — Duties, Union Purchase and Slewing Rigs The winch and derrick combination is the older half of cargo handling, and it is still the arrangement on a great many ships. Intermediate 5 min read

07 Deck Cranes — Three Motions, Level Luffing and Safety Features The deck crane does the same work as a pair of derricks and two winches, but does it with three motions from one machine and no rigging to prepare. Intermediate 5 min read

08 Hatch Covers and Cargo Access — Types, Seals, Cleats and Surveys The hatch cover is not strictly a machine, but it is a mechanism with hydraulics, seals, cleats and a maintenance burden that falls on the engine department. Intermediate 7 min read

09 Lifeboat Davits and Davit Winches — Gravity Lowering and Two Brakes The davit is the one piece of deck machinery that exists purely to save life, and it is designed on a principle that is the opposite of every other winch on the ship — lowering is by gravity, and the machinery's job is to slow the boat down, not to lower it. Intermediate 5 min read

10 Maintenance of Deck Machinery — Intervals, Greasing and Overhauls Deck machinery is maintained on a schedule rather than on condition, because it is idle too much of the time for condition monitoring to mean anything and too exposed for a fault to be found by casual inspection. Beginner 5 min read

11 Safety on Deck — Stored Energy, Isolation and Hazardous Areas Deck machinery kills people in a small number of well-known ways — stored energy in a rope, gravity in a hatch cover or a lifeboat, a machine that moves when nobody expects it to, and a brake that was not what it appeared to be. Beginner 9 min read

Propeller, Shafting & Stern Tube

The shafting volume: what the system carries and how it is sized, bearings, the thrust block, couplings and bolts, the propeller shaft, faults and withdrawal, water- and oil-lubricated stern tubes, split stern bearings, seals, alignment, the propeller, reduction gearing and the ancillaries.

14 Topics →

01 The Shafting System — What It Carries and How It Is Sized The shafting system carries the engine's torque out through the hull to the propeller, takes the propeller's thrust back into the ship, and holds the weight of the propeller while the hull bends underneath it. Beginner 11 min read

02 Shaft Bearings — Plain, Tilting Pad and Roller The intermediate shafting runs between the thrust block and the stern tube, and it has to be carried. Intermediate 8 min read

03 The Thrust Block and Thrust Shaft — Clearance, Pads and Support The thrust block is the one bearing in the shaft line that takes the ship's drive out of the shaft and puts it into the hull. Intermediate 10 min read

04 Shaft Couplings and Coupling Bolts — Flange, Hydraulic and Muff The shaft line is built in lengths, and every joint between them is a place where the drive has to pass from one shaft to the next and where the line has to be got true. Intermediate 9 min read

05 The Propeller Shaft — Liners and Propeller Mounting The propeller shaft is the part of the line that is under water, carries the propeller, and has to be protected against the sea and against the propeller's own weight. Intermediate 11 min read

06 Propeller Shaft Faults, Weardown and Withdrawal The propeller shaft is the one part of the shaft line that cannot be inspected while the ship is in service, and it is also the part that fails catastrophically when it does fail. Advanced 9 min read

07 Sea Water Lubricated Stern Tubes — Staves, Water Supply and Rewooding The stern tube is the bearing at the after end of the shaft line, and the oldest way of lubricating it is with the sea. Intermediate 9 min read

08 Oil Lubricated Stern Tubes — White Metal, Lip Seals and Header Tanks The oil-lubricated stern tube is the modern arrangement. Advanced 10 min read

09 Split Stern Bearings and Withdrawable Stern Gear The stern tube bearing is the hardest part of the shaft line to reach, and the traditional answer — drydock the ship and draw the shaft — costs a docking every time the bearing has to be looked at. Advanced 13 min read

10 Stern Tube Seals — Lip, Floating Ring and Radial Face The seal is the part of a stern tube that fails, and the part that decides whether the ship can be worked afloat. Intermediate 12 min read

11 Shaft Alignment — Datums, Sighting Methods and the Jacking Check Alignment is the subject that ties the shaft line together. Advanced 21 min read

12 The Propeller — Fixed Pitch, Controllable Pitch and Cavitation The propeller is the machine that turns the engine's torque into thrust, and it is the only part of the plant that works in the sea. Intermediate 16 min read

13 Reduction Gearing, Flexible Couplings and Clutches A medium-speed diesel does not turn at a propeller's speed, and the machinery that sits between the two is the reduction gearbox. Advanced 12 min read

14 Shafting Ancillaries — Friction Brake, Torsionmeter and Earthing Device The shaft line carries three fittings that are not part of the drive and not part of the support, but that the engineer has to know about: the shaft friction brake and the trailing collar, which are there for when the engine has failed; the torsionmeter, which is how shaft power is measured and how the torsional characteristics of the line are checked; and the shaftline earthing device, which is a small electrical fitting that prevents a large and expensive mechanical failure. Beginner 15 min read

Watchkeeping

Running the engine room like a professional: watchkeeping duties in port and at sea, work organisation and the safety rounds that prevent detentions.

1 Topic →

01 Engine Watchkeeping — Handover, Rounds & Work Safety Who must stand the watch, what the handover must cover, and how rounds and maintenance stay safe. Beginner 10 min read

Boiler

The auxiliary boiler end to end: how the plant works as five flows, safe start-up and shutdown, normal operation and load control, water treatment and blowdown, safety devices and emergency response, systematic troubleshooting, and survey and repair.

7 Topics →

01 Boiler Plant Working Flow Five flows — water, steam, fuel, air and signal — and the failure pattern that explains almost every boiler fault. Intermediate 16 min read

02 Start-up, Raising Steam, and Shutdown A cold boiler is steel that will grow, water that is not circulating, refractory that will crack, and a furnace that may hold gas. Intermediate 17 min read

03 Normal Operation, Load Control, and Watchkeeping Normal operation is not a fixed set of numbers — it is a dynamic balance held inside limits while the ship’s demand moves around it. Intermediate 16 min read

04 Boiler Water Treatment, Testing, and Blowdown Every litre of feedwater carries salts and gases that stay behind and concentrate — treatment holds the chemistry inside limits. Advanced 22 min read

05 Boiler Safety Devices and Emergency Response Every protection corresponds to an accident that has already happened to someone else — bypassing one removes the warning, not the hazard. Intermediate 18 min read

06 Troubleshooting the Boiler Boiler faults do not arrive as single readings — they arrive as patterns, where one indication moves first and the rest follow. Advanced 20 min read

07 Overhauling, Inspection, and Repair A survey is not a search for damage — it is a structured comparison between the condition found and the condition it should be in. Advanced 20 min read

Pumps

The complete pump series: how pumps work, construction, suction and NPSH, performance curves, watchkeeping, pumping systems, troubleshooting, overhaul and safety.

9 Topics →

01 Pump Principles and Pump Types A pump does not create flow — it adds energy, and the system decides how much of it becomes flow. Intermediate 14 min read

02 Centrifugal Pump Construction Learn the parts and their failure modes, and most pump faults become diagnosable. Intermediate 18 min read

03 Suction, NPSH, Cavitation and Priming Discharge-side problems are usually obvious and recoverable; suction-side problems are subtle, damaging, and often diagnosed too late. Advanced 20 min read

04 Performance, Curves, Affinity Laws and the System A pump is sold as a curve, not as a number — understanding the curve is what separates an engineer from an operator. Advanced 18 min read

05 Operation and Watchkeeping Most pump failures announce themselves days in advance — watchkeeping exists to catch the announcement. Intermediate 16 min read

06 Pumping Systems Onboard A pump is only as good as the system it sits in — most "pump problems" turn out to be system problems. Intermediate 20 min read

07 Troubleshooting Index The pump is rarely the first thing that changed — find what changed, and the fault names itself. Intermediate 22 min read

08 Overhaul, Inspection and Repair An overhaul done badly is worse than no overhaul — the damage is built in while the equipment is open. Advanced 26 min read

09 Safety and Emergency Actions A pump that is "stopped" is not a pump that is "isolated" — that difference is where people get hurt. Intermediate 18 min read

Marine Electrical Systems

Function 5 quick-reference — switchboards and protection, motors and starters, transformers and electronics, alternators and parallel running, batteries, instruments and safety systems.

12 Topics Module Hub

Fundamentals & Laws

Electrical fundamentals: AC vs DC, active and reactive power, electricity flow, and Ohm, Faraday and Kirchhoff laws.

2 Topics →

01 Electrical Fundamentals — Current, Power & Laws What flows, what AC changes, which power does work, and the three laws every calculation stands on. Beginner 7 min read

02 Phase, RMS Value & Power Factor Explained What phase means, what RMS pays for, and why the fleet sails at 0.8 while chasing 1. Beginner 10 min read

Switchboards & Protection

Main switchboard safeties, preferential and reverse-power trips, breaker types and trip units, bus transfer and MSB maintenance.

2 Topics →

01 Switchboards & Protection — MSB to Emergency Bus What guards the main bus, how preferential and reverse-power trips think, and the switch that never parallels wrong. Intermediate 9 min read

02 Protection Chain — Contactors, Breakers, Overload vs Short Circuit Light-duty brains command heavy-duty muscle, and every device trips only its own fault — never the healthy bus. Intermediate 9 min read

Motors & Starters

Induction motors, single phasing, megger testing, DOL/star-delta/auto-transformer/soft starters, motor safeties and temperature class.

3 Topics →

01 Induction Motors — Principle, Faults & Testing How a rotating field drags a rotor, the checklist that finds a dead motor, and the tests that prove health. Intermediate 12 min read

02 Motor Starters — Taming 8–10× Current Why a starting motor gulps current, the maths that tames it to one-third, and the contactors that must never meet. Intermediate 10 min read

03 Crane, Windlass & Deck Machinery — Brakes, Checks, Tests & Safeties Power holds the brake off, springs put it on — five crane checks prove it, a test kit proves the windlass brake, and two safety families back both. Intermediate 12 min read

Transformers & Electronics

Transformer types and kVA rating, diodes including Zener, thyristors/SCRs, and the oxygen sensor.

1 Topic →

01 Transformers, Diodes & Thyristors How shared flux trades volts for amps, why DC cannot cross, and the one-way valves of electronics. Beginner 8 min read

Alternators & Parallel Running

Brushless and self-excited alternators, construction and maintenance, paralleling with synchroscope, AVR and reverse-power protection.

2 Topics →

01 Brushless Alternator Working, Paralleling & AVR Explained How excitation without brushes works, the ritual that parallels two live machines, and the loop that holds voltage. Intermediate 12 min read

02 Diesel Generator Starting Procedure & Alternator On-Load | Marine Guide How a diesel set goes from dead iron to sharing bus load, what slip says about motors, and why breakers refuse fools. Intermediate 13 min read

Batteries & Supplies

Lead-acid batteries, capacity and rating, charging and trickle circuits, and shipboard 440/220 V distribution with lighting.

1 Topic →

01 Marine Batteries: Lead-Acid vs NiCd, Charging & 440/220 V Distribution How a cell becomes a bank, why trickle beats cooking, and why motors drink 440 while lamps sip 220. Beginner 11 min read

Instruments & Safety Systems

Megger IR testing, thermocouples, earth-fault tracing, detectors, intrinsic safety, neutral systems, ICCP and emergency generation.

1 Topic →

01 Instruments & Safety Systems Meters that stress insulation, sensors that read heat, barriers that starve sparks — and the rescue drill when current finds a human. Intermediate 14 min read

Interactive Simulation

3D Ship Structure Lab

16 real-time Three.js interactive 3D models of ship hull components, compartments and safety gear with orbital camera and part dissection.

Launch 3D Lab

Platform & Feeds

Developer APIs, Feeds & Tools

Open data feeds, progress tracking, and machine-readable endpoints for maritime students and developers.

My Progress Dashboard Local-first browser tracking of finished lessons, streaks and bookmarks. /dashboard → Interactive 3D Lab Visual structural simulations rendered in real-time WebGL. /3d-lab → XML Sitemap Standard XML protocol sitemap for search engines, spiders and webmasters. /sitemap.xml → RSS / Atom Feed Syndication feed for maritime engineering readers and feed aggregators. /feed.xml → LLMs Context File Compact markdown index following the llms.txt standard for AI assistants. /llms.txt → Topics JSON API Static lightweight JSON endpoint exposing metadata for all lessons. /api/topics →

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Developer APIs, Feeds & Tools