Page 212 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

11.1.13.5 Sampling and Gauging
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A cargo tank should never be opened to the atmosphere for
gauging or sampling purposes while the ship is connected to the
shore vapour recovery system unless loading to the tank is
stopped, the tank is isolated from any other tank being loaded and
space of a cargo tank on board could transfer rapidly to theิชย์นาวี
precautions are taken to reduce any pressure within the cargo
tank vapour space.

On non-inerted tankers, precautions against static hazards should
also be followed. (See Section 11.8.)

11.1.13.6 Fire/Explosion/Detonation
The interconnection of ship and shore vapour streams, which may
or may not be within the flammable range, introduces significant
งานห้องสมุด ศูนย์ฝกพาณ
additional hazards that are not normally present when loading.
Unless adequate protective devices are installed and operational
procedures adhered to, a fire or explosion occurring in the vapour

terminal and vice versa.

A detonation arrestor should be fitted in close proximity to the
terminal vapour connection at the jetty head in order to provide
primary protection against the transfer or propagation of a flame
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from ship to shore or from shore to the ship.

The design of the terminal vapour collection and treatment
system will determine whether or not flammable vapours can be
safely handled and, if they cannot, will include provisions for
either inerting, enriching or diluting the vapour stream and
continuously monitoring its composition.

11.1.13.7 Liquid Condensate in the Vapour Line

The ship’s systems should be provided with means to effectively
drain and collect any liquid condensate that may accumulate
within vapour pipelines. Any build-up of liquid in the vapour line
could impede the free passage of vapours and thus increase
in-line pressures and could also result in the generation of
significant electrostatic charges on the surface of the liquid. It is
important that drains are installed at the low points in the ship’s
vapour piping system and that they are routinely checked to
ensure that no liquid is present.

11.1.13.8 Electrostatic Discharge

The precautions contained in Section 11.1.7.3, with regard to
initial loading rates, and in Section 11.8, with regard to measuring
and sampling procedures, should be followed. In addition, to
prevent the build-up of electrostatic charges within the vapour
collection system, all pipework should be electrically bonded to
the hull and should be electrically continuous. The bonding
arrangements should be inspected periodically to check their
condition. The terminal vapour connections should be electrically
insulated from the tanker vapour connection by the use of an
insulating flange or a single section of insulating hose.

178 © ICS/OCIMF/IAPH 2006