2.2.1 Each chemical, product or crude carrier
should have vapour collection piping which is permanently installed
with a tanker vapour connection located as close as practical to the
loading manifold. In lieu of permanent piping, Administrations may
permit chemical tankers to have a permanent vapour connection at each
cargo tank for connection to a vapour hose which should be kept as
short as practicable.
2.2.2 If a tanker simultaneously collects vapours
from cargoes which react in a hazardous manner with other cargoes,
it should keep these incompatible vapours separate throughout the
entire vapour collection system.
2.2.3 A means should be provided to eliminate
liquid condensate which may collect in the system, such as draining
and collecting liquid from each low point in the line.
2.2.4 Vapour collection piping should be electrically
bonded to the hull and should be electrically continuous.
2.2.5 When inert gas distribution piping is used
for vapour collection piping, means to isolate the inert gas supply
from the vapour collection system should be provided. The inert gas
main isolation valve required by SOLAS 74, as amended, chapter II-2, regulation 62.10.8 may be
used to satisfy this requirement.
2.2.6 The vapour collection system should not
interfere with the proper operation of the cargo tank venting system.