6.3 Hot Work Precautions, Electrical Safety on Deck & Gangway Watch

6.3 Hot Work Precautions, Electrical Safety on Deck & Gangway Watch

Daily shipboard operations require constant vigilance across a diverse range of technical disciplines. Deck and engine ratings frequently engage in hot work repairs involving welding and grinding, operate portable electric power tools in damp marine environments, and maintain port security access watches at the gangway. Each of these activities carries severe hazards—including catastrophic fires, lethal electric shocks, and port security breaches. General Purpose (GP) Ratings must master the statutory precautions governing hot work permits, the technical principles of extra-low voltage and Lockout/Tagout (LOTO) electrical safety, accommodation ladder rigging standards, and gangway watchkeeping duties under the International Ship and Port Facility Security (ISPS) Code.

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1. Hot Work Safety & Precautions Onboard

Definition of Hot Work

Hot Work refers to any maintenance, repair, or construction task that involves open flames, electric arcs, incandescent sparks, or elevated heat capable of igniting flammable vapors, combustible liquids, or solid materials. Common shipboard hot work includes:

• Electric arc welding (SMAW, MIG, TIG)
• Oxy-acetylene gas flame cutting, burning, and heating
• Brazing and soldering
• Power disc grinding and abrasive wheel cutting

+---------------------------------------------------------------------------------------------------+
|                                 MANDATORY HOT WORK PERMIT CONTROLS                                |
+---------------------------------+---------------------------------+-------------------------------+
|       CLEAR THE WORK AREA        |       BOUNDARY PRECAUTIONS      |         FIRE WATCH DUTY       |
| - Remove all combustibles       | - Gas-free opposite spaces      | - Dedicated crew member       |
| - Cover wooden decks with sand  | - Remove flammable cargo/paint  | - Charged hose + extinguisher |
| - Rig flame-retardant screens   | - Check reverse bulkhead face   | - Frequent checks at least 2h  |
+---------------------------------+---------------------------------+-------------------------------+

Hot Work Permit Requirements

Under the vessel’s SMS, obtain a Hot Work Permit from the designated authorizing officer before hot work outside the workshop. COSWP recommends a permit for such work; the risk assessment and permit specify controls and responsibilities.

1. Clear and Protect the Work Area:
   • Remove combustibles such as dunnage, cardboard, rags, grease, paint, thinners and mooring ropes to a safe distance. The permit specifies the clearance for heat and sparks; 10 metres may be used in a company procedure, but is not a universal statutory radius.
   • Immovable combustible items, wooden deck planking, and pipe insulation must be protected by suitable fire-resistant barriers; wet down where appropriate. If effective protection is not possible, do not proceed.
   • Fire blankets or welding screens must be rigged around grinding and welding areas to contain incandescent spatter and sparks.
2. Boundary and Adjacent Space Precautions:
   • Steel is an exceptional conductor of thermal energy. Heat generated by welding or burning on one side of a steel plate transmits instantly to the opposite side, where it can easily ignite combustible materials, tank coatings, or explosive hydrocarbon atmospheres.
   • Both sides of the bulkhead, deck, and deckhead must be inspected.
   • Assess adjacent compartments, double bottoms and cofferdams for heat transfer and flammable contents. Clean, isolate, ventilate and test affected spaces as required; spaces that have contained flammables must be certified free of flammable gas before repair work.
   • Do not carry out hot work on a fuel-tank or dangerous-cargo-space boundary until the affected spaces and systems have been made safe and the specific work authorized. A tank’s name alone does not establish that it is safe or prohibit all future repair work.
3. Atmospheric Testing:
   • Before hot work, a person trained in atmospheric testing must test the work area and affected adjacent spaces as required by the permit: hydrocarbon gas levels must register $0\%\text{ LEL}$, and oxygen must be $20.9\%$.

The Dedicated Fire Watch & Post-Work Monitoring

• Dedicated Watchkeeper: A designated crew member (such as an AB or GP rating) must be assigned solely as the Fire Watch. The fire watchkeeper must never assist in the actual welding or cutting; their sole duty is fire surveillance.
• Firefighting Equipment Staged:
  • A pressurized, charged fire hose connected to the ship's fire main fitted with a dual-purpose (jet/spray) nozzle laid out at the job site.
  • Suitable portable extinguishers immediately at hand, with types and numbers specified for the hazards in the permit.
• Post-Work Monitoring Period:
  • Latent heat and smoldering slag can ignite fires hours after hot work terminates.
  • Maintain the dedicated fire watch for the period specified in the permit, covering all affected areas.
  • COSWP advises frequent checks for at least two hours after work stops, including the opposite sides of affected boundaries. The risk assessment may require longer monitoring. Close the permit only after the prescribed inspections confirm safe conditions.

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2. Electrical Safety on Deck & Portable Electrical Equipment

The Lethal Hazard of Marine Electric Shock

Onboard merchant ships, electric shock hazards are magnified dramatically compared to shore environments. The presence of saltwater, sea spray, and humid air saturates surfaces with conductive electrolyte ions. Dry human skin possesses an electrical resistance of approximately $10,000\text{ to }50,000\text{ }\Omega$, but when wet with saline water, human skin resistance collapses to less than $500\text{ }\Omega$.

$$I = \frac{V}{R} = \frac{220\text{ V}}{500\text{ }\Omega} = 0.44\text{ A} = 440\text{ mA}$$

An alternating current ($AC$) of merely $50\text{ mA}$ passing across the human chest triggers ventricular fibrillation, respiratory paralysis, and fatal cardiac arrest. Consequently, standard shipboard voltages of 220V AC and 440V AC are acutely lethal in wet marine deck environments.

Voltage Standards for Portable Equipment

Select portable tools, lamps and protective arrangements for the location and the ship’s approved electrical system. Reduced voltage limits risk but does not make unsuitable equipment safe.

1. Portable Hand Lamps (Wander Leads):
   • Use approved low-voltage lamps in wet or conductive spaces. A 24V SELV inspection lamp with an approved separated supply is one suitable example when selected for the task. COSWP advises portable-lamp supplies not exceeding 50V, with additional precautions where needed.
2. Portable Power Tools:
   • For damp, humid or highly conductive locations, COSWP 18.15 recommends supplies no higher than 50V AC, with a maximum 30V to earth, or 50V DC. Follow the ship’s approved arrangements and use pneumatic or other suitable alternatives when appropriate.
   • In a 110V centre-tapped-earth (CTE) circuit, each conductor is 55V to earth. That arithmetic does not establish that the tool or supply is suitable for a wet location.
3. Insulation and Earthing:
   • Double insulation is identified by the double-square symbol. It is a protection class, not permission to use any tool on a wet deck. Use equipment rated for its environment and preserve the required earthing or insulation protection.
4. Residual Current Devices (RCD):
   • Where specified, a high-sensitivity RCD rated 30mA or less provides additional protection. It must be selected and tested by competent personnel. Do not confuse its rated residual current with a universal 30ms operating time, or rely on it instead of isolation.

Cable Care and Lockout / Tagout (LOTO)

• Cable Inspection: Flexible trailing cables must be elevated above wet steel deck plates using non-conductive plastic 'S' hooks. Seafarers must inspect cables prior to every use for cuts, worn outer sheathing, flattened spots, or loose industrial waterproof plugs.
• Lockout / Tagout (LOTO):
  • Before any maintenance is performed on deck machinery, winches, cranes, or electrical circuits, the system must undergo formal Lockout/Tagout:
    1. Stop and Identify: Stop the equipment and identify every electrical, hydraulic, pneumatic, mechanical and other hazardous energy source.
    2. Isolate: Disconnect all relevant sources at their proper isolating points; a local stop button alone is not isolation.
    3. Lock and Tag: Secure the isolators and attach “DANGER – DO NOT OPERATE” identification under the ship’s LOTO procedure, protecting every person working on the equipment.
    4. Release or Restrain: Discharge stored electrical energy, depressurize systems and secure parts that could move under gravity or stored force.
    5. Verify: A competent person confirms effective isolation before work. Electrical testing requires suitable voltage indicators and proving arrangements; ratings must not touch conductors or perform electrical work beyond their authorization.

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3. Gangway Watch, Security & Access Control (ISPS Code)

When a vessel berths alongside a port quay, the accommodation ladder or gangway serves as the primary physical bridge connecting the ship to shore. It is the vessel's first line of defense against unauthorized entry, smuggling, stowaways, and maritime security threats.

Fixed and Portable Ladder Safety

Inspect the ladder before use and report damage or slippery rungs. Face the ladder and maintain three-point contact while climbing. Keep both hands free to grip; hoist tools and materials separately in a tool bag rather than carrying them in pockets.

Place a portable ladder on a firm base at about 75° to the horizontal and secure it against slipping or sideways movement. Lock extension sections before use. Provide safe handholds at the upper landing; normally the ladder extends at least 1 metre above it. Do not use a portable ladder when ship motion makes it unsafe.

Rigging Standards for Accommodation Ladders and Gangways

Under SOLAS Chapter II-1, Regulation 3-9 and IMO Circular MSC.1/Circ.1331 (Guidelines for Construction, Installation, Maintenance and Inspection/Ganging of Means of Embarkation and Disembarkation), accommodation ladders and gangways must adhere to rigid engineering criteria:

                           [ SHIP DECK ]
                                 |\  <- Angle of inclination max 55° (30° gangway)
                                 | \ 
                                 |  \  <- Rigid stanchions & taut handropes
                                 |   \ 
  +------------------------------+----\-----------------------------+
  |  SAFETY NET RIGGED BENEATH   |     \                            |
  |  FULL LENGTH AND BREADTH     |      \                           |
  +------------------------------+-------\--------------------------+
                                         |\  <- Roller resting on quay
                                 ========+===
                                  [ PORT QUAY ]

• Maximum Angle of Inclination:
  • Accommodation ladders must not be used at an angle of inclination greater than 55° from the horizontal.
  • Straight brow gangways must not exceed 30° from the horizontal.
  • Operating beyond these angles creates severe slip and fall risks for boarding personnel.
• Gangway Safety Net:
  • A heavy-duty, certified polypropylene safety net must be firmly rigged beneath the entire length and breadth of the ladder.
  • The net must extend well beyond both sides of the ladder, bridging the gap between the ship's side plating and the quay wall to catch any person falling during transit.
• Life-Saving Gear Staged at Gangway Head:
  • A certified lifebuoy equipped with an attached buoyant lifeline of at least 30 meters in length and an automatic self-igniting light must be mounted immediately adjacent to the ladder head.
• Stanchions and Handropes:
  • Rigid steel stanchions must be locked upright with locking pins; upper and intermediate handrails (or taut wire ropes/chains) must be tensioned firmly.
• Night Illumination:
  • Adequate lighting of at least 20 lux must illuminate the entire length of the ladder and the quay landing area at night.
• Bulwark Ladder: A bulwark ladder with sturdy grab rails must be positioned inside the ship's bulwark to allow safe descent onto the deck.
• Rat Guards: All mooring lines connecting the vessel to the pier must be fitted with approved conical or disc rat guards facing outward toward the ship to prevent the embarkation of rodents.

Pilot-Ladder Rigging and Stowage

Rigging must be supervised by a responsible officer in communication with the bridge. Wear the required PPE and use the rigging safety line and harness. Inspect the identified ladder, side ropes, steps, spreaders and securing equipment before use; report defects and do not use an unsafe ladder.

Secure the ladder to approved strong points on deck, never handrails. Its steps must remain horizontal, with the ladder resting firmly against the ship’s side; steps or spreaders must not carry the securing load. Set the lower end to the height agreed for the pilot boat and keep access to the deck clear. Provide adequate lighting, a lifebuoy with self-igniting light and a heaving line. After use, clean, inspect and stow the ladder safely to prevent damage. Mechanical pilot hoists are prohibited under SOLAS V/23; a winch reel stores a ladder and is not a device for hoisting the pilot.

Gangway Watchkeeping Duties

A Trainee GP Rating assigned to gangway watch duty holds critical security and safety responsibilities:

1. Permanent Presence: Remain stationed at the gangway head at all times; never abandon the post until formally relieved by the incoming watchkeeper.
2. Access Control & Visitor Identification:
   • Intercept every person attempting to board.
   • Verify official photo identification (port security badge, seafarer CDC, government ID, or company passport).
   • Issue a serialized Shipboard Visitor Pass in exchange for identification.
3. The Gangway Logbook:
   • Accurately record every arrival and departure in the official Gangway Logbook: Date, Full Name, Represented Company/Authority, Reason for Visit, Official ID Number, Time Boarded, and Time Departed.
4. Screening of Baggage & Stores:
   • In compliance with the Ship Security Plan (SSP), inspect packages, bags, and incoming ship stores for prohibited items (weapons, contraband, alcohol, drugs, explosives).
5. Monitoring Mooring Lines and Tides:
   • As the ship loads or discharges cargo, and as oceanic tides rise and fall, the vessel's draft and height relative to the quay change continuously.
   • The gangway watch must monitor the ladder roller on the quay, adjust gangway hoisting wires to prevent structural crushing or over-steepening, and alert the Bosun or Duty Officer if mooring lines become excessively slack or dangerously tensioned.

ISPS Code Security Levels

Under the International Ship and Port Facility Security (ISPS) Code, security levels are set by the flag Administration and the relevant Contracting Government. A ship in port follows a higher level set by that Government. The port facility implements its assigned level; it does not independently set the level: