Page 384 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

If leakage occurs from a pipeline, valve, hose or metal arm, operations
through that item should be stopped until the cause has been ascertained
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and the defect has been rectified. If a pipeline, hose or arm bursts or if
there is an overflow or other spill, all cargo and bunker operations should
be stopped immediately and should not be restarted until the fault has
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been rectified and all hazards from the released oil have been eliminated.
If there is any possibility of the released oil or of petroleum gas entering
an engine room or accommodation space intake, appropriate preventive
measures must be taken quickly.

Means should be provided for the prompt removal of any spillage on
deck. Any oil spill should be reported to the terminal and port authorities
and the relevant shore and shipboard oil pollution emergency plans
should be activated.

Harbour authorities and any adjacent ship or shore installations should be
warned of any potential hazard caused by the spill.

24.7.2 Sea and Overboard Discharge Valves
At the start of loading and at regular intervals throughout loading,
discharging, ballasting and tank washing, a watch should be kept to
ensure that oil is not escaping though sea valves.
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Sea and overboard discharge valves connected to the cargo and ballast
systems must be securely closed and lashed and may be sealed when
not in use. In-line blanks should be inserted where provided. When
lashing is not practical, as with hydraulic valves, some suitable means of
marking should be used to indicate clearly that the valves are to remain
closed.
For further information on this subject, reference should be made to the
ICS/OCIMF publication ‘Prevention of Oil Spillages Through Cargo
Pumproom Sea Valves’.

24.7.3 Scupper Plugs

Before cargo handling commences, all deck scuppers and, where
applicable, open drains on the jetty must be effectively plugged to prevent
spilled oil escaping into the water around the tanker or terminal.
Accumulations of water should be drained periodically and scupper plugs
replaced immediately after the water has been run off.

Oily water should be transferred to a slop tank or other suitable
receptacle. The tank pressure should be reduced to facilitate draining, if
necessary.

24.7.4 Spill Containment

A permanently fitted spill tank, provided with suitable means of draining,
should be fitted under all ship and shore manifold connections. If no
permanent means are fitted, portable drip trays should be placed under
each connection to retain any leakage. The use of plastic should be
avoided unless provision for bonding is made.

350 © ICS/OCIMF/IAPH 2006