17.11.1 The vapour space of cargo tanks equipped
with submerged electric motor pumps shall be inerted to a positive
pressure prior to loading, during carriage and during unloading of
flammable liquids.
17.11.2 The cargo shall be discharged only by
deepwell pumps or by hydraulically operated submerged pumps. These
pumps shall be of a type designed to avoid liquid pressure against
the shaft gland.
17.11.3 Inert gas displacement may be used for
discharging cargo from type C independent tanks, provided the cargo
system is designed for the expected pressure.