IGEM/G/4 Edition 2 - Definitions for the gas industry
The standard provides definitions of terms used in Institution of Gas Engineers and Managers (IGEM) standards and guidance documents.
The standard recognises inconsistency between definitions within IGEM Standards issued up to September 2009 due to the time period over which those Standards were developed. It attempts to consolidate the varied use of different terms across IGEM Standards, to provide a base for their future amendment and to represent current best practice.
Definitions contained within such an IGEM Standard published prior to 1st September 2009 may continue to be used until such time as that Standard is made obsolete. Where an IGEM Standard is published on or after 1st September 2009 and does not contain definitions, then the IGEM/G/4 Standard applies.
Introduction
1.1 This Standard provides definitions of terms used in Institution of Gas Engineers and Managers (IGEM) Standards.
1.2 For the purposes of this Standard, definitions have been agreed between the relevant IGEM Committees responsible for the publication of IGEM Standards.
1.3 This Standard recognises inconsistency between definitions within IGEM Standards issued up to September 2009 due to the time period over which those Standards were developed. It attempts to consolidate the varied use of different terms across IGEM Standards, to provide a base for their future amendment and to represent current best practice.
Definitions contained within such an IGEM Standard published prior to 1st September 2009 may continue to be used until such time as that Standard is made obsolete. Where an IGEM Standard published on or after 1st September 2009 does not contain definitions, this Standard applies.
1.4 For metering, this Standard should be read alongside IGEM/G/1 “Defining the end of the Network, a meter installation and installation pipework”, whose definitions specifically have been accepted by Ofgem as definitions for metering arrangements in Great Britain. The definitions from IGEM/G/1 are replicated in IGEM/G/4 but drawings of “standard” and “legacy” designs of metering arrangements are not.
When required, it is the intention to amend both IGEM/G/1 and IGEM/G/4 simultaneously to retain consistency.
1.5 This Standard is produced on CD and can be freely downloaded from IGEM’s website alongside IGEM/G/1 for use on personal computer systems. In the event an update is required to any definition, an amendment will be issued which will be freely available to download from the IGEM website. This amendment will be tailored so that it can be inserted into hardcopies of IGEM/G/4. Alternatively the whole updated version may be downloaded from the IGEM website.
1.6 Requests for interpretation of this Standard in relation to matters within its scope, but not precisely covered by the current text, should be addressed to Technical Services, IGEM, IGEM House, High Street, Kegworth, Derbyshire, DE74 2DA and will be submitted to the relevant Committee for consideration and advice, but in the context that the final responsibility is that of the engineer concerned. If any advice is given by, or on behalf of, IGEM, this does not relieve the responsible engineer of any of his or her obligations.
1.7 This Standard was published in December 2012.
Scope
2.1 This Standard is applicable to all Natural Gas systems and to liquefied petroleum gas (LPG) and LPG/air systems where appropriate.
2.2 All pressures are gauge pressures unless otherwise stated.