Page 188 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

10.10 Pumproom Entry Precautions
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Cargo pumprooms are to be considered as enclosed spaces and the
requirements of this Chapter should be followed to the maximum extent
cargo operations have been completed.์ฝกพาณิชย์นาวี
possible. However, because of their location, design and the operational need
for the space to be routinely entered by personnel, pumprooms present a
particular hazard and therefore necessitate special precautions, which are
described in the following Sections.

10.10.1 Ventilation
Because of the potential for the presence of hydrocarbon gas in the
pumproom, SOLAS requires the use of mechanical ventilation by
extraction to maintain the atmosphere in a safe condition.

SOLAS requires that ships built from July 2002 be provided with
continuous monitoring of the pumproom atmosphere and an audible and
visual alarm system which will activate when the hydrocarbon gas
concentration in the pumproom exceeds a pre-set level, which should not
be more than 10% LFL.

ึ
Throughout cargo handling operations, the pumproom ventilation system
must be in continuous operation and the gas detection system, if fitted,
งานห้องสมุด ศูนย
should be functioning correctly.
Ventilation should be continuous until access is no longer required, or

10.10.2 Pumproom Entry Procedures

Before anyone enters a pumproom, it should be thoroughly ventilated, the
oxygen content of the atmosphere verified and the atmosphere checked
for the presence of hydrocarbons and any toxic gas associated with the
cargo being handled.

Only where a fixed gas detection system is correctly calibrated and tested
and provides gas readings as a percentage LFL (% LFL) to a level of
accuracy equivalent to portable gas instruments, at representative
locations within the pumproom, should it be used to provide information
for safe entry into the space.

Formal procedures should be in place to control pumproom entry. The
procedure used should be based on a risk assessment, and should
ensure that risk mitigation measures are followed and that entries into the
space are recorded.

A communications system should provide links between the pumproom,
navigation bridge, engine room and cargo control room. In addition,
audible and visual repeaters for essential alarm systems, such as the
general alarm and the fixed extinguishing system alarm, should be
provided within the pumproom.

Arrangements should be established to enable effective communication to
be maintained at all times between personnel within the pumproom and
those outside. Regular communication checks should be made at

154 © ICS/OCIMF/IAPH 2006