5.2.1 All
piping, valves and fittings are to be suitable for the design operating
and environmental conditions.
5.2.2 The
piping is to comply with the requirements for manufacture, testing
and certification of Class II piping systems.
5.2.3 The
pipelines and associated piping systems and equipment forward and/or
aft of the cargo area are to have only full penetration butt welded
joints, except at the loading station where valve connections may
be flanged. The pipes are not to pass through enclosed spaces and
are to be, as far as possible, self-draining.
5.2.4 Means
of mechanical isolation are to be provided in the cargo area, where
any pipes used for cargo handling are branched off from the cargo
system. Such isolation is to be as near as possible to the boundary
of the aftmost, in the case of stern loading, or forwardmost, in the
case of bow loading, cargo tank bulkhead and within the cargo area.
5.2.5 A manually
operated shut-off terminal valve is to be provided at the manifold.
In addition, a blank flange, or equivalent arrangement, is to be provided
at the bow and/or stern pipe line end connection.
5.2.6 The
terminal pipe, valves and other fittings to which the cargo hose is
directly connected are to be of steel or other approved ductile material.
They are to be of robust construction, adequately supported and suitable
for the stated design conditions. Attention is drawn to the Recommendations
for Oil Tanker Manifolds and Associated Equipment, published
by OCIMF.
5.2.7 Means
of emptying, cleaning, inerting and gas-freeing the pipe lines used
for cargo handling are to be provided. The venting arrangements are
to be located in the cargo deck area. Isolation similar to that described
in Pt 7, Ch 6, 5.2 Piping system design 5.2.4 is also to be provided.
5.2.8 A drip
tray of adequate size, together with means of drainage, are to be
provided at the manifold. Suitable spray shields are to be fitted
in way of the terminal manifolds where leakage may occur at valves
and pipe joints.
5.2.10 Air
vent pipes to the tanks and enclosed spaces, and mechanical ventilation
outlets are to be located as far as possible, but in no case less
than 3 m, from the terminal manifold or the nearest barrier of the
spillage drip tray, whichever is closer.