Page 28 - International safety guide for oil tankers and terminals

INTERNATIONAL SAFETY GUIDE FOR OIL TANKERS AND TERMINALS

Grounding
See ‘Earthing’.
Inert gasช้เพื่อการศึกษาเท่านั้น---
Halon
A halogenated hydrocarbon used in fire-fighting that inhibits flame propagation.
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
Hazardous area
An area on shore which, for the purposes of the installation and use of electrical
equipment, is regarded as dangerous. Such hazardous areas are graded into
hazardous zones depending upon the probability of the presence of a flammable gas
mixture. (For ships, see ‘Dangerous area’.)

Hazardous task
A task other than Hot Work which presents a hazard to the ship, terminal or personnel,
the performance of which needs to be controlled by a risk assessment process such as
a Permit to Work system or a controlled procedure.

Hazardous zone
See ‘Hazardous area’.

Hot Work
Work involving sources of ignition or temperatures sufficiently high to cause the ignition
of a flammable gas mixture. This includes any work requiring the use of welding,
burning or soldering equipment, blow torches, some power driven tools, portable
electrical equipment which is not intrinsically safe or contained within an approved
explosion-proof housing, and internal combustion engines. ึ

Hot Work Permit
A document issued by a Responsible Person permitting specific Hot Work to be done
during a particular time interval in a defined area.

Hydrocarbon gas
A gas composed entirely of hydrocarbons.

Inert condition
---ใ Inert gas plant
A condition in which the oxygen content throughout the atmosphere of a tank has been
reduced to 8 per cent or less by volume by the addition of inert gas.

A gas or a mixture of gases, such as flue gas, containing insufficient oxygen to support
the combustion of hydrocarbons.

All equipment fitted to supply, cool, clean, pressurise, monitor and control the delivery of
inert gas to the cargo tank systems.

Inert Gas System (IGS)
An inert gas plant and inert gas distribution system together with means for preventing
backflow of cargo gases to the machinery spaces, fixed and portable measuring
instruments and control devices.

Inerting
The introduction of inert gas into a tank with the object of attaining the inert condition.

Insulating flange
A flanged joint incorporating an insulating gasket, sleeves and washers to prevent
electrical continuity between ship and shore.

xxviii © ICS/OCIMF/IAPH 2006