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PART XI
INSTRUCTION MANUAL(S)

67. Instruction Manuals required to be provided on board should contain the following information and operational instructions.

(1) A line drawing of the inert gas system should show the positions of the inert gas pipework from the boiler or gas generator uptakes to each cargo tank and slop tank; gas scrubber; scrubber cooling water pump and pipework up to the effluent discharge overboard; blowers including the suction and discharge valves; recirculation or other arrangements to stabilize the inert gas plant operation; fresh air inlets; automatic gas pressure regulating stop valve; deck water seal and water supply, heating and over-flow arrangements; deck non-return stop valve; water traps in any supply, vent, drain and sensing pipework; cargo tank isolation arrangement; purge pipes/vents; pressure/vacuum valves on tanks; pressure/vacuum breakers on the inert gas main; permanent recorders and instruments and the take-off points for their use; arrangements for using portable instruments, complete and partial wash bulkheads, mast risers, mast riser isolating valves; high velocity vents; manual and remote controls.

(2) A description of the system should be included and a listing of procedures for checking that each item of the equipment is working properly during the full cycle of tanker operation. This includes a listing of the parameters to be monitored, such as inert gas main pressure, oxygen concentration in the delivery main, oxygen concentration in the cargo tanks, temperature at the scrubber outlet and blower outlet, blower running current or power, scrubber pump running current or power, deck seal level during inert gas discharge to cargo tanks at maximum rate, deck seal level at nil discharge, etc. Established values for these parameters during acceptance trials should be included, where relevant.

(3) Detailed requirements should be given for conducting the operations described in Parts IV and V, particular to the installation of the ship, such as times to inert, purge and gas-free each tank, sequence and number of tanks to be inerted, purged and gas-freed, sequence and number of purge pipes/vents to be opened or closed during such operations, etc.

(4) Dangers of leakage of inert gas and hydrocarbon vapours and precautions to prevent such leakages should be described relating to the particular construction and equipment on board.

(5) Dangers of cargo tank overpressure or underpressure during the various stages in the cycle of tanker operation, and the precautions to be taken to prevent such conditions, should also be described in detail relating to the particular construction or the equipment on board.

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