Page 179 - International safety guide for oil tankers and terminals

ENCLOSED SPACES

While personnel are in a tank or compartment, ventilation should be continuous.
space are implemented.ศึกษาเท่านั้น---
Regeneration of hydrocarbon gas should always be considered possible, even after
loose scale or sludge has been removed. Continual checks on the atmosphere in the
space should be made as specified in the Safety Management System.
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
Atmosphere tests should always be made after any interruption or break in the work.
Sufficient samples should be drawn to ensure that the resulting readings are
representative of the condition of the entire space.

When entering cargo and bunker tanks, all the tanks and spaces adjacent to the
space to be entered should also be tested for hydrocarbon gas and oxygen content
and, where appropriate, the inert gas pressure should be lowered to reduce the
possibility of any inter-tank leakage. Notwithstanding this precaution, personnel
should remain alert to the possibility of leakage of hydrocarbon gas from adjacent
spaces or from pipelines running through the tank.

10.4 Control of Entry into Enclosed Spaces

It is the responsibility of the Company to establish procedures for safe entry of
personnel into enclosed spaces. The process of requesting, raising, issuing and
documenting permits to enter into an enclosed space should be controlled by
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procedures in the ship’s Safety Management System (SMS). It is the Master’s
responsibility to ensure that the established procedures for entry into an enclosed

The Master and Responsible Officer are responsible for determining whether entry
into an enclosed space may be permitted. It is the duty of the Responsible Officer to
ensure:
That the space is ventilated.
That the atmosphere in the compartment is tested and found satisfactory.

That safeguards are in place to protect personnel from the hazards that are
identified.
That appropriate means for controlling entry are in place.

Personnel carrying out work in an enclosed space are responsible for following the
procedures and for using the safety equipment specified.

Prior to entry into an enclosed space, a risk assessment should be completed to
identify the potential hazards and to determine the safeguards to be adopted. The
resulting safe working practice should be documented and approved by the
Responsible Officer before being countersigned by the Master, who confirms that the
practice is safe and in compliance with the ship’s Safety Management System. The
permit, or other enabling document, should be sighted and completed by the person
entering the space, prior to entry.

The controls required for safe entry vary with the task being performed and the
potential hazards identified during the risk assessment. However, in most cases, an
Entry Permit System will provide a convenient and effective means of ensuring and
documenting that essential precautions have been taken and, where necessary, that
physical safeguards have been put in place. The adoption of an Entry Permit System,
which may include the use of a check-list, is therefore recommended.

Permission to continue work should only be given for a period sufficient to complete
the task. Under no circumstances should the period exceed one day.

© ICS/OCIMF/IAPH 2006 145