Page 32 - igem-g-4 edition 2

IGEM/G/4 Edition 2
modification
Temporary or permanent physical change to any aspect to an existing installation or design.

molecular seal
Device designed to prevent mixing of air and gas to a flammable concentration upstream of
the position of the seal.

monitor/active (regulator)
Arrangement of two regulating devices in series whose pressure settings are stepped so as to
allow one (active) normally to control the outlet pressure and the other (monitor) to assume
control in the event of failure of the active device to the open position.

multiple vent
System of vents whereby gas is discharged to atmosphere by simultaneous venting from two
or more adjacent vent stacks.

multi-storey
Containing more than one storey, either above or below ground but not including a
basement/cellar.

natural draught burner
Burner not requiring a fan or other mechanical means to supply combustion air.

natural draught flue system
Flue system in which the draught is provided by the thermal force arising from the heat of the
products of combustion.

near miss
Incident arising out of, or in connection with, work which did not cause injury to any person
and was not a “dangerous occurrence” but which might easily have caused an injury.

network
Part of the Network, a network comprises interconnecting pipes which are downstream of a
gas reception terminal, processing facility, storage facility or importing interconnector, and
used for the conveyance of gas to consumers as defined in the Gas Safety (Management)
Regulations (GS(M)R).

network analysis
Modelling of a pipe system to simulate flows and pressures assuming that instantaneous
supplies and demands are identical.

network analysis, transient
Modelling of the pipe system to simulate flows and pressures, taking into account that supplies
and demands will vary with time, and may not match.

network controller
Suitably qualified engineer appointed by the Responsible Engineer (RE) to be the point of
contact for all internal and external organisations.

node, relating to network design
Notional point on a gas supply system, used in network analysis, to identify a junction of two
or more pipe sections, including a change in pipe diameter or material or used to allocate gas
demands to the system.

noggins
Horizontal timber rails fitted between studs in the wall panels to provide fixing points.

non-controlled interface
System interface where gas pressure and/or flow is not continuously controlled.

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