LSA Chapter 3: Line Throwing, EEBD & SCABA

1. Line Throwing Apparatus

For "tell me about the line throwing apparatus and how far it throws?" start with what it is and where it lives, then the figures.

• Minimum 1 pc (one complete apparatus) carried on board, kept on the bridge.
• Must be capable of throwing a line with reasonable accuracy toward a ship, casualty or shore station.
• Comprises 4 self-contained rocket projectiles, aerodynamically stabilised with an integral propellant charge, each capable of carrying the line to not less than 230 m in calm weather, with 4 buoyant, non-kinking flaked lines, each of breaking strength not less than 2 kN. The lines are flaked inside the container so they run free without snagging.
• Supplied with brief instructions or diagrams clearly illustrating use, stencilled legibly on the exterior of the container and kept with the set. Firing is by a weather-protected safety trigger with a removable safety pin.

Pistol-fired rocket versus integral rocket-and-line

• Pistol-fired rocket: the rocket is fired from a pistol; the line and rockets together with the means of ignition are stowed in a container which provides protection from the weather.
• Integral rocket and line: the rocket and line form one assembly; the assembly is contained in a water-resistant casing with the line turned out from the cylinder.
• In both types the firing works on a spring kept under high tension — when the lever is pressed, the rope comes out from the cylinder and the projectile carries it away.

• The projectile is a yellow-coloured cylinder, fired in the direction of the wind at an angle of 45 degrees to achieve the maximum projectile path.
• Firing drill: keep the set on the bridge, remove the safety pin provided to prevent accidental release of the rope, aim the cylinder at 45 degrees with the wind, and fire — never point it at personnel.

Firing order

Bridge — safety pin out — 45 degrees — with the wind — fire. Quote the set as 4 × 230 m projectiles with 4 × 2 kN lines, spring-fired by lever, pistol type in a weather-protecting container or integral type in a water-resistant casing, with instructions.

2. EEBD (Emergency Escape Breathing Device)

EEBD = Emergency Escape Breathing Device. It is an escape-only set — for getting out of a smoke-filled or toxic space, never for going in to fight a fire.

Locations on a cargo ship

• Accommodation: minimum 2, plus 1 spare.
• Engine room (ECR): 1; near the workshop: 1; at each deck or platform: 1.
• Stowed ready for use and easily visible — mostly in the engine control room, workshop and near escape routes — so any crew member can grab and don one immediately.
• Exact numbers and positions on your ship come from the Fire Control and Safety Plan.
• Brief instructions for operation and use, with diagrams or pictures, are provided with each set.

Construction — what is inside the set

• Cylinder: a small cylinder carrying 2.5 litres of oxygen (breathing air), along with a demand valve and low-pressure alarm.
• Hood and facepiece: fresh air or oxygen comes inside the hood and the facepiece, which are connected to the cylinder through the demand valve.
• Clear window: a clear window is provided in the facepiece, made of flame-resistant material for clear sighting and smooth escaping.
• Pressure indicator: fitted so the wearer knows the remaining pressure, and knows the charging limit while charging the cylinder.
• Gives escape air for a service duration of not less than 10 minutes.

Wearing procedure (new type)

• Open the case and pull the hood out — removing the hood normally activates the air supply automatically.
• Pull the hood fully over the head, face looking through the clear flame-resistant window.
• Tighten the neck seal so smoke cannot leak in around the neck.
• Breathe normally — the demand valve feeds air on each inhalation — and escape immediately by the shortest safe route; never stop to fight the fire.

Prohibitions — what the EEBD is NOT for

• Not for firefighting; not for entering oxygen-deficient voids or tanks; not to be worn by firefighters in place of a firefighter outfit.

Charging, checks and life

• Charged with the ship's breathing-air compressor, using a suitable adaptor — otherwise it is charged by an external authority in port.
• Monthly checks: the indicator needle must sit in the green zone (proving no leak), and the case must be kept clean.
• Check and record expiry dates — a typical EEBD is valid for 15 years.
• Do not open the EEBD for practice; a separate training piece is carried and used for training purpose only so working sets stay sealed.

3. SCABA Construction & Working Duration

SCABA = Self-Contained Air Breathing Apparatus — also called the BA set, SCBA or CABA (Compressed Air Breathing Apparatus) — used to supply fresh air when a person enters any space where the atmosphere is suspect and may not support human life. For "describe your BA set?" walk the air path from cylinder to mask: 200 bar in the cylinder, brought down to about 4 bar by the reducer, and then to breathable pressure at the mask on demand.

When it is used

• Entering an enclosed space whose atmosphere cannot be trusted.
• Entering a space to fight fire as part of the fire party.

Construction and air path

• Air cylinders: carried on a sturdy backplate with shoulder harness and waist belt; charged with compressed air up to 200 bar (single cylinder of 1200–1240 litres or two smaller cylinders).
• Reducing valve (pressure reducer): brings the high cylinder pressure of 200 bar down to a medium pressure of around 4 bar.
• Lung demand regulator (demand valve): brings the 4-bar medium pressure down to breathable atmospheric pressure; feeds air on inhalation.
• Full face mask: covers eyes, nose and mouth, made of hypoallergenic silicone or rubber with a panoramic visor giving a clear field of view, speech diaphragm and head harness.
• Exhalation valve: vents exhaled air out of the mask and prevents smoky or toxic ambient air from entering.
• Pressure gauge (manometer): mounted on the shoulder strap, continuously shows the remaining cylinder pressure.
• Warning whistle: sounds when the pressure drops to 55 bar ± 5 bar (50–60 bar), giving the wearer approximately 10 minutes of air to evacuate to safety.

Duration formula — the viva standard

For a standard 1200 L set (6 L × 200 bar): 1200 ÷ 40 = 30 minutes total, minus 10 minutes safety margin = 20 minutes safe working time.

Air consumption rates by work rate

• Resting: 8–12 L/min
• Light work: 12–20 L/min
• Moderate work: 20–40 L/min (standard planning average: 40 L/min)
• Heavy work: 40–60 L/min

Safety checks before donning

• Cylinder pressure must not be less than 80% full when starting work.
• Check the gauge reading regularly; the whistle sounds at 55 bar ± 5 bar.
• When the whistle sounds, exit to a safe area by the shortest and safest route.
• Do not remove the equipment until in a safe area, clear of the hazard.

SCABA high-pressure & whistle alarm test procedure

1. Charge & read pressure: open the cylinder valve fully and read the pressure gauge — it must indicate full working pressure, minimum 200 bar.
2. High-pressure leak check: close the cylinder valve and observe the pressure gauge for one full minute; the pressure drop must not exceed 10 bar per minute.
3. Slow venting via demand valve: cover the demand valve opening with the palm of your hand and press the manual flush button slightly to vent trapped air slowly.
4. Verify whistle alarm sound: confirm that the low-pressure warning whistle sounds clearly at 55 bar ± 5 bar (50–60 bar), proving the ~10-minute withdrawal warning is functional.

4. Low-Pressure Alarm Test, Function Checks & During Use

Surveyors rigorously test candidate execution of the self-contained compressed air breathing apparatus (SCABA) safety sequence during oral and flag-state safety inspections. SCABA sets operate on a two-stage pressure reduction circuit designed to maintain positive internal facepiece pressure (+3.5 mbar), ensuring any peripheral seal compromise results in outward air leakage rather than inward ingress of toxic gases or superheated smoke.

The key figures behind that sequence:

• Cylinder charge pressure: 200 / 300 bar.
• Whistle alarm trip point: 55 ± 5 bar.
• Maximum allowable high-pressure leak: 10 bar/min.
• Positive mask pressure: +3.5 mbar.
• SOLAS air capacity for a 30-minute set: at least 1,200 L.

Low-pressure whistle & leakage integrity test (surveyor execution order)

1. Full system charge: open the cylinder handwheel slowly and completely until back-seated. Confirm the shoulder contents gauge indicates full working pressure — 200 bar for steel or 300 bar for carbon composite.
2. Cylinder isolation: firmly close the cylinder handwheel to seal the high-pressure charge within the whip line and regulator manifold.
3. High-pressure leakage observation: observe the gauge needle stationary for 60 seconds. The statutory maximum permissible leakage is 10 bar per minute or less; any higher decay rate indicates defective manifold seals or O-rings.
4. Controlled line venting: cover the lung demand valve (LDV) outlet with the clean palm of your hand and gently depress the central manual bypass/purge button to vent trapped medium-pressure air.
5. Whistle audible trip verification: monitor the falling gauge needle continuously. The mechanical audible alarm whistle must trip sharply and sound continuously between 55 bar ± 5 bar (50–60 bar).
6. Residual vent to zero: continue venting until the gauge reads zero bar, verifying that the whistle ceases when all air is completely exhausted.

Pre-donning facepiece seal & operational checks

• Negative pressure face seal: with the cylinder closed and the mask donned, inhale deeply to collapse the facepiece against the cheeks. Hold the breath for 10 seconds; the facepiece must stay collapsed without leakage.
• Positive pressure delivery: open the cylinder fully and inhale sharply; the LDV must click and deliver air smoothly without flutter or breathing resistance, maintaining +3.5 mbar overpressure.
• Exhalation valve action: exhale firmly; expired air must discharge effortlessly through the chin exhalation valve without fluttering or sticking.
• Bypass / flush button: depress the central rubber purge button on the LDV; a continuous high-volume blast of air must flush the facepiece to clear fogging or debris.

Warning — the tactical rule of thirds for BA wearers. Statutory entry rule: cylinders must be at least 80% fully charged (at least 240 bar for 300 bar sets) before entry. Air consumption must follow the Rule of Thirds: one third of the air for entry and task execution, one third for egress, and one third as safety margin. When the whistle triggers at 55 bar, approximately 8 to 10 minutes of escape air remain — wearers must immediately abort tasks and withdraw via the verified escape route.

5. Doffing, Mask Care & Maintenance Intervals

For "what do you do after using the BA set?" give the doffing order first, then mask care, then the interval ladder the surveyor ticks off — in short: doff, clean, test.

After use — doffing order

• Press the reset lever to switch to the OFF position; press and hold down the button and remove the demand valve.
• Removing the mask: insert the index fingers behind the tabs on the neck straps, press the buckles forward with the thumbs, pull the mask forward off the face and then up and back over the head.
• Close the cylinder valve and remove the facepiece.
• Unbuckle the waist belt, lift the shoulder-strap buckles to loosen, and remove the equipment.

Mask cleaning, disinfecting, drying and testing

• Cleaning: the mask must be cleaned after every use — cloth with lukewarm water and all-purpose detergent, rinsed thoroughly under running water. Never use organic solvents such as acetone or alcohol.
• Disinfecting: place the mask in a disinfectant bath with approved disinfectants only — excessive concentration or over-long times damage the mask — then rinse thoroughly under running water.
• Drying: leave to dry in air at a maximum 60 °C, kept out of direct sunlight.
• Testing: the mask must be tested every time it has been used, repaired or serviced, per the maker instructions.
• Speech diaphragm: visually inspect — the diaphragm and O-ring must be clean and undamaged; clean or replace if not.
• Inhalation valve: visible in the mask connector — blow into it and check both wings of the valve disc move freely; replace if seized.
• Exhalation valve: remove the protective cap, press one arm of the spring clamp inward and remove it, lift the disc out by the nipple. Disc and seat must be clean and undamaged; moisten with water and refit — when the seat is horizontal the disc must slide into the guide under its own weight — then fit the spring clamp (marked L and R) at an angle.

Maintenance intervals — the statutory ladder

• Monthly routine: inspect air bottles, bottle valves and pressure reducers; check intermediate hoses, manometer and harness backplate; test the lung demand regulator and withdrawal warning whistle.
• Yearly inspection: thorough test of all internal valves and sealing rings, check the acoustic performance of the speech diaphragm, and functional test on a calibrated test bench.
• Every 2 years: mandatory replacement of the exhalation valve disc, whether or not the mask was used — it prevents hardening or micro-leakage in toxic atmospheres.
• Every 5 years: major overhaul of the reduction valve in an authorised workshop, hydrostatic pressure stretch test of the air cylinders ashore, and immediate replacement of any bottle showing corrosion or impact damage.

Mask hygiene post-use rule

Clean with lukewarm water and mild detergent (no solvents), then disinfect in an approved bath, then air dry at a maximum 60°C away from direct sun, then test the speech diaphragm and confirm the exhalation disc slides home under its own weight.

Surveyor asks

Surveyors commonly ask: "tell me about the line throwing apparatus / EEBD / SCABA including figures?" Answer one appliance at a time:

• Line throwing: 1 set, 4 × 230 m projectiles, 4 × 2 kN lines, yellow cylinder at 45 degrees with the wind, safety pin, bridge stowage, pistol weather container versus integral water-resistant casing.
• EEBD: accom 2 + 1 spare, ECR 1, workshop 1, each deck 1, 2.5 L demand-valve hood set, at least 10 min, never for firefighting, monthly green-zone check, 15-year life.
• SCABA: open-circuit for enclosed space and firefighting, 1240 L gives about 31 / 21 min, whistle at 50–55 bar leaves about 10 min, consumption 8–12 / 12–20 / 20–40 / 40–60 L/min, duration = capacity ÷ 40 − 10 (1200 ÷ 40 = 30 − 10 = 20), alarm test 200 bar, then 10 bar/min or less, then whistle at 55 bar (50–60), 80%-full rule, disc every 2 years, overhaul every 5 years.