Page 29 - igem-g-4 edition 2

IGEM/G/4 Edition 2
low pressure cut-off valve
Valve which will shut off the gas supply in the event of the gas pressure falling below a
pre-determined value.

low pressure gasholder
Containment where a cylinder or piston is arranged to rise and fall to accommodate varying
volumes of gas.

main (for liquefied petroleum gas (LPG))
Pipe used for distributing LPG in the vapour phase from a central bulk storage installation to
more than one premises.

main burner
Device to generate a main flame.

main flame
Flame, other than the start-gas flame, on a main burner.

main flame establishment period
Where the main flame is ignited from a previously ignited pilot flame, the period during which
gas may be admitted to the main burner before supervision of the main flame is required.

main/common flue
That part of a flue system carrying products of combustion from two or more appliances.

main gas
Gas supply to establish and maintain the main flame.

maintenance
Combination of all technical and associated administrative actions intended to retain an item
in, or restore it to, a state in which it can perform its required function.

major accident hazard
Specific term defined in the Control of Major Accident Hazard Regulations (COMAH) which
means an occurrence resulting from uncontrolled developments in the course of an industrial
activity leading to a serious danger to persons or the environment.

management control system
Logical control of all operations.

management system
Organisation and arrangements established by a company for managing its undertaking.

marker plate
Plate giving details of buried gas plant.

marker post
Post installed close to buried gas plant, to which a marker plate is affixed.

maximum incidental pressure (MIP)
Maximum pressure which a system is permitted to experience under fault conditions, limited
by safety devices.

maximum operating pressure (MOP)
Maximum pressure at which a system can be operated continuously under normal operating
conditions.

25
©IGEM, IGEM House, High Street, Kegworth, Derbyshire, DE74 2DA. Website: www.igem.org.uk