A line drawing of the inert gas system showing 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 overflow arrangements; deck nonreturn
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.