17.14.1.1. The capacity
of each tank should not exceed 600 m3 and the total capacity
of all cargo tanks should not exceed 1,200 m3.
17.14.1.2 The tank design
vapour pressure should not be less than 13.5 bar (see also 7.1.3 and 17.3.2).
17.14.1.3 Parts of tanks
protruding above the upper deck should be provided with protection
against thermal radiation taking into account total engulfment by
fire.
17.14.1.4 Each tank should
be provided with two pressure relief valves. A bursting disc of appropriate
material should be installed between the tank and the pressure relief
valves. The rupture pressure of the bursting disc should be 1 bar
lower than the opening pressure of the pressure relief valve, which
should be set at the design vapour pressure of the tank but not less
than 13.5 bar gauge. The space between the bursting disc and the relief
valve should be connected through an excess flow valve to a pressure
gauge and a gas detection system. Provision should be made to keep
this space at or near the atmospheric pressure during normal operation.
17.14.1.5 Outlets from
pressure relief valves should be arranged in such a way as to minimize
the hazards on board the ship as well as to the environment. Leakage
from the relief valves should be led through the absorption plant
to reduce the gas concentration as far as possible. The relief valve
exhaust line should be arranged at the forward end of the ship to
discharge outboard at deck level with an arrangement to select either
port or starboard side, with a mechanical interlock to ensure that
one line is always open.
17.14.1.6 The Administration
and the port Administration may require that chlorine is carried in
refrigerated state at a specified maximum pressure.