15.12.1 Exhaust openings
of tank vent systems shall be located:
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.1 at a height of B/3 or 6 m, whichever is greater,
above the weather deck or, in the case of a deck tank, the access gangway;
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.2 not less than 6 m above the fore-and-aft gangway,
if fitted within 6 m of the gangway;
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.3 15 m from any opening or air intake to any
accommodation and service spaces; and
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.4 the vent height may be reduced to 3 m above the
deck or fore-and-aft gangway, as applicable, provided high-velocity vent valves of
an approved type, directing the vapour/air mixture upwards in an unimpeded jet
with an exit velocity of at least 30 m/s, are fitted.
15.12.2 Tank venting systems
shall be provided with a connection for a vapour-return line to the
shore installation.
15.12.3 Products shall:
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.1 not be stowed adjacent to oil fuel tanks;
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.2 have separate piping systems; and
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.3 have tank vent systems separate from tanks
containing non-toxic products.
15.12.4 Cargo tank relief-valve
settings shall be a minimum of 0.02 MPa gauge.