Page 26 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

Combustible gas indicator (also referred to as ‘Explosimeter’)
An instrument for measuring the composition of hydrocarbon gas/air mixtures, usually
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giving the result as a percentage of the Lower Flammable Limit (LFL).

Company
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
The owner of a ship or any other organisation or person, such as the manager or the
bareboat charterer, who has assumed the responsibility for the operation of the ship
from the owner of the ship, including the duties and responsibilities imposed by the ISM
Code.

Competent person
A person who has been adequately trained to undertake the tasks they are required to
perform within their job description. For personnel in the shipping industry, they should
be able to demonstrate this competence by the production of certificates recognised by
the ship’s administration.

Dangerous area
An area on a tanker which, for the purposes of the installation and use of electrical
equipment, is regarded as dangerous. (For terminal, see ‘Hazardous area’.)

Dry chemical powder
A flame inhibiting powder used in fire-fighting.

Earthing (also referred to as ‘Grounding’)
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The electrical connection of equipment to the main body of the ‘earth’ to ensure that it
is at earth potential. On board ship, the connection is made to the main metallic
structure of the ship, which is at earth potential because of the conductivity of the sea.

Enclosed space
A space that has limited openings for entry and exit, unfavourable natural ventilation,
and that is not designed for continuous worker occupancy.
This includes cargo spaces, double bottoms, fuel tanks, ballast tanks, pump rooms,
cofferdams, void spaces, duct keels, inter-barrier spaces, engine crankcases and
sewage tanks.

Entry permit
A document issued by a Responsible Person allowing entry into a space or
compartment during a specific time interval.

Explosimeter
See ‘Combustible gas indicator’.

Explosion-proof (also referred to as ‘Flame-proof’)
Electrical equipment is defined and certified as explosion-proof when it is enclosed in a
case that is capable of withstanding the explosion within it of a hydrocarbon gas/air
mixture or other specified flammable gas mixture. It must also prevent the ignition of
such a mixture outside the case either by spark or flame from the internal explosion or
as a result of the temperature rise of the case following the internal explosion. The
equipment must operate at such an external temperature that a surrounding flammable
atmosphere will not be ignited.

Explosive range
See ‘Flammable range’.

Flame arrester
A permeable matrix of metal, ceramic or other heat-resisting materials which can cool
even an intense flame, and any following combustion products, below the temperature
required for the ignition of the flammable gas on the other side of the arrester.

xxvi © ICS/OCIMF/IAPH 2006