17.14.2.1 Cargo discharge
should be performed by means of compressed chlorine vapour from shore,
dry air or another acceptable gas or fully submerged pumps. The pressure
in the vapour space of the tank during discharging should not exceed
10.5 bar gauge. Cargo discharge compressors on board ships should
not be accepted by the Administration.
17.14.2.2 The design pressure
of the cargo piping system should be not less than 21 bar gauge. The
internal diameter of the cargo pipes should not exceed 100 mm. Only
pipe bends should be accepted for compensation of pipeline thermal
movement. The use of flanged joints should be restricted to a minimum,
and when used the flanges should be of the welding neck type with
tongue and groove.
17.14.2.3 Relief valves
of the cargo piping system should discharge to the absorption plant
(see also 8.2.16).