scope:

This Standard covers the installation and operation of compressors, with outlet pressures in the range exceeding 0.5 bar but not exceeding 400 bar.

Note 1: Requirement for the installation of boosters and compressors with outlet pressures not exceeding 0.5 bar are given in IGEM/UP/2.

Note 2: For the purposes of this Standard and IGEM/UP/2, a booster is a centrifugal machine with an outlet pressure not exceeding 0.5 bar.

This Standard applies to compressors pressurising NG (or an equivalent 2^nd family gas as defined in BS EN 437). This Standard may not be appropriate for other gases such as 1^st family, other 2^nd family and 3^rd family gases, including "landfill gas", "mines gas", "digester gas" etc; (see Sub-Section 4.3).

Note: Some principles in this Standard could be applied to other gases however further specialist requirements will need to be specified by the relevant compressor manufacturer.

This Standard applies only to gas compressors that are installed downstream of a primary meter installation.

This Standard does not specify the design and manufacturing requirements of compressors such as those contained in BS EN 1012.

This Standard applies to new construction and replacement of, or extension to, servicing, maintenance of existing installations using compressors. It is not retrospective, but it is recommended that existing installations be modified to meet this Standard, when appropriate.

Note: Standards rarely cover the retrospective issue of existing installations. They can, however, set a basis for consideration of performance upon which a risk assessment can be developed.

Unless otherwise specified, metric standard conditions are assumed by this Standard.

All pressures are gauge pressures unless otherwise stated.

Italicised text is informative and does not represent formal requirements.

Appendices are informative and do not represent formal requirements unless specifically referenced in the main sections via the prescriptive terms "must", "shall" or "should".