Page 21 - igem-g-4 edition 2

IGEM/G/4 Edition 2
flue pipe
Pipe enclosing a flue.

fluid assisted boring/drilling
Guided boring technique using a combination of mechanical drilling and pressurised fluid jets
to provide the soil cutting action.

flying lift
Inner lift of a column-guided gasholder which can rise above the guide framing.

foaming off
Use of expanding foam injected into a pipeline, which sets to stop the flow of gas.

fogging
Dispersion of micro droplets (liquid phase) of conditioning fluid in a gas stream.

forced draught burner
Burner in which the combustion air is provided under pressure.

free handle valve
Safety shut-off valve (SSOV) which, when energised, can be opened or closed by the manual
operation of a handle and which, when de-energised, closes and cannot be opened by the
operation of the handle.

freely ventilated
More than adequately ventilated.

fuel gas
Any combustible gas or mixture of gases.

functional test
Test which provides evidence that equipment is in working order.

fusion
Welded joints made on polyethylene (PE) systems, by the controlled application of heat and
pressure.

galvanic isolation
Circuit incorporating electronic components and an isolating device that will provide electrical
isolation between a signal input and a signal output, thus ensuring that the hazardous area
equipment (usually connected to the signal output) is electrically floating relative to the
non-hazardous area equipment (usually connected to the signal output).

gas conditioning
Process where a sealing medium is transported to joints, either in the liquid or the vapour
phase, by the contained gas itself.

gas conveyor
Person who conveys gas through pipes and the Network and having duties under the Gas
Safety (Management) Regulations (GS(M)R) and the Pipelines Safety Regulations (PSR) and
who may also hold a Gas Transportation Licence.

gas detector
Instrument used for the detection of gas concentration.

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