57.1 For the purpose of application of regulation 30.4.2, the cross-sectional
area of the small diameter line should not exceed:
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.1 10% of that of a main cargo discharge line
for oil tankers delivered after 1 June 1982, as defined in regulation 1.28.4 or oil tankers
delivered on or before 1 June 1982, as defined in regulation 1.28.3 not already
fitted with a small diameter line; or
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.2 25% of that of a main cargo discharge line
for oil tankers delivered on or before 1 June 1982, as defined in regulation 1.28.3 already fitted
with such a line. (See paragraph 4.4.5 of the revised COW Specifications
contained in resolution A.446(XI) as
amended by the Organization by resolutions
A.497(XII) and A.897(21)).
57.2
Connection of the small diameter line
to the manifold valve.
The phrase “connected outboard of” with respect
to the small diameter line for discharge ashore should be interpreted
to mean a connection on the downstream side of the tanker’s
deck manifold valves, both port and starboard, when the cargo is being
discharged. This arrangement would permit drainage back from the tanker’s
cargo lines to be pumped ashore with the tanker’s manifold valves
closed through the same connections as for main cargo lines (see the
sketch shown in appendix 3).