Only purpose-built inflatable work boats of an approved type are to be used for tank repair work and tank inspections. Before and during their use, the following precautions should be taken:
- If the tanks are connected by a common venting system, or an IG system, the tank in which the boat is to be used should be isolated to prevent a transfer of gas to or from other tanks. Procedures must be established that ensure the tank is re-connected to its venting system on completion of the work.
- The appropriate atmosphere checks should be carried out.
- An enclosed space entry permit should be issued.
- All deck apertures, such as tank washing plates, should be opened and effective ventilation maintained continuously while persons are in the tank.
- Adequate lighting of an approved type, such as air-driven lamps, should be available.
- The work boat should only be used when the water surface in the tank is calm.
- The work boat should only be used in tanks containing clean ballast water. The water level in the tank should be either stationary or falling; on no account must the level of the water be rising while the boat is in use.
- A responsible person should act as a look-out at the top of the tank and, if the boat is working at a point remote from the tank hatch, an additional look-out should be positioned down the access ladder at a point where a clear view of the boat is provided.
- Approved breathing apparatus and resuscitation equipment should be ready for use at the entrance to the tank.
- All personnel working in the compartment should wear a buoyancy aid.
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