Page 195 - International safety guide for oil tankers and terminals

SHIPBOARD OPERATIONS

11.1.6.3 Emergency Shutdown Plan
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An emergency shutdown procedure, and alarm, should be agreed
between the ship and the terminal and recorded on an appropriate
form.
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The agreement should designate those circumstances in which
operations must be stopped immediately.

Due regard should be given to the possible dangers of a pressure
surge associated with any emergency shutdown procedure,
(see Section 16.8).

11.1.6.4 Supervision

The following safeguards should be maintained throughout
loading:

A Responsible Officer should be on watch and sufficient crew
should be on board to deal with the operation and security of
the tanker. A continuous watch of the tank deck should be
maintained.

The agreed ship-to-shore communications system should be
maintained in good working order.
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At the commencement of loading, and at each change of
watch or shift, the Responsible Officer and the Terminal
Representative should each confirm that the communications
system for the control of loading is understood by them and by
personnel on watch and on duty.

The standby requirements for the normal stopping of shore
pumps on completion of loading, and the emergency stop
system for both the tanker and terminal, should be fully
understood by all personnel concerned.

11.1.6.5 Inert Gas Procedures

Prior to the commencement of loading, the inert gas plant should
be closed down and the inert gas pressure in the tanks to be
loaded reduced unless simultaneous loading and discharge of
cargo is to take place.

11.1.6.6 Closed Loading
For effective closed loading, cargo should be loaded with the
ullage, sounding and sighting ports securely closed. The gas
displaced by the incoming cargo should be vented to the
atmosphere via the mast riser(s) or through high velocity or
constant velocity valves, either of which will ensure that the gases
are taken clear of the cargo deck. Devices fitted to mast risers or
vent stacks to prevent the passage of flame should be regularly
checked to confirm they are clean, in good condition and correctly
installed.

In order to undertake closed loading, the vessel should be
equipped with ullaging equipment that allows the tank contents to
be monitored without opening tank apertures. (Closed gauging
and sampling is discussed in detail in Section 11.8.1.)

© ICS/OCIMF/IAPH 2006 161