Page 39 - igem-g-4 edition 2

IGEM/G/4 Edition 2
purge velocity
Velocity of the purge gas in the pipe being purged.

purge volume
Theoretical volume of purge medium to complete the purge.

rails (spiral rails - spiral-guide rails)
o
Steel rails, similar to railway lines, attached at 45 to the lifts of spiral-guided gasholder, to
control the lifts as they rise and fall.

ramp rate
Rate of change of gas flow.

reamer/reaming
Tool or the process of using a tool for opening the hole to a larger diameter than the pilot
bore.

receiver
Vessel on the outlet of a gas compressor having a volume sufficient to provide storage volume
of gas at high pressure to satisfy the pressure and flow requirements of the load it serves.

reception/receive/exit shaft/pit
Excavation into which trenchless technology equipment is driven and recovered following the
installation or renovation of the product (pipe, conduit or cable).

recommended gas supply arrangements
Gas supply arrangements that are recognised by IGEM/G/1, as being preferred arrangements.

regulator
Device which automatically controls pressure or volume flow at a selected point in a gas
stream.

regulator/PRI inlet valve (RIV/PRIIV)
Valve fitted upstream of, and adjacent to, a regulator/PRI to shut off the supply of gas.

regulator/PRI outlet valve (ROV/PRIOV)
Valve fitted downstream of, and adjacent to, a regulator/PRI to shut off the supply of gas.

reinstatement
Backfilling, compaction and re-surfacing of any excavation to restore the surface and
underlying structure to enable it to perform its original function.

release rate
Quantity of flammable gas emitted per unit time from a source of release.

relief valve
Valve which automatically opens at a pre-determined pressure to vent gas so as to relieve
pressure in a gas system.

repair
Process to restore a system to its original performance.

residential park home
Mobile home, designed to comply with BS 3632 but that does not meet all legal requirements
for the construction and use of road vehicles. It is a caravan for permanent residence as
defined in the Caravan Sites and Control of Development Act and the Caravan Sites Act.

resistance
Ability of a component to withstand forces acting on it.

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