scope:

This Standard covers the design, construction, inspection, testing, operation and maintenance, decommissioning, and disposal of any installation installed as below.

For the above phases in the lifecycle of an installation, a quality management system is to be applied in accordance with BS EN ISO 9001.

This Standard covers any PRI or >7 bar pipeline installation containing:

a) Natural Gas (NG) that is installed in:

• a transmission pipeline (whose design is in accordance with IGEM/TD/1) or

• a distribution main (whose design is in accordance with IGEM/TD/3) or

• a service (whose design is in accordance with IGEM/TD/4).

b) Liquid Petroleum Gas (LPG), or mixtures of LPG and air, that is installed in a distribution main whose design is in accordance with IGEM/TD/3 or in service pipework whose design is in accordance with IGEM/TD/4.

Note 1: For regulating installations downstream of an emergency control valve (ECV) (which defines the end of the Network as in IGEM/G/1 (NG) or downstream of a distribution main or service pipework (LPG and LPG/air)), and which are associated with a meter installation, the relevant standards are IGEM/GM/4, IGEM/GM/6, IGEM/GM/8, BS 6400-1, BS 6400-2 (all for NG) and BS 6400-3 (for LPG), as appropriate. There are no recognised equivalent Standards to the IGEM/GM Standards where LPG or LPG/air is used. The principles of the IGEM/GM Standards may be applied.

Note 2: Where it is required to install a PRI downstream of an ECV or downstream of a distribution main or service not associated with a meter installation, the principles of this Standard may be applied. See also Figures 2,3 and 4.

Note 3: Minimum requirements are contained in appropriate normative Standards (see Figures 2, 3 and 4).

This Standard covers PRI's and >7 bar pipeline installations of:

a) MOP not exceeding:

• for NG, 100 bar

Note: Higher MOP's may be accommodated, in which case specialist advice needs to be sought in addition to adopting the principles of the Standard.

• for LPG, 16 bar

• for LPG/air, 2 bar.

b) operating temperature:

• for NG, between -20°c and 120°c

• for LPG, between -20°c and 50°c

• for LPG/air, between -20°c and 50°c.

Figure 1 shows the relationship between IGEM/TD/13 and IGEM/TD/1 with respect to the scope of installations covered by this Standard.

This Standard covers installations for gases in the vapour phase. This Standard does not address gases in the liquid phase.

There is no intention that this Standard be applied retrospectively. However, for inspection, testing, and operation and maintenance, IGEM/TD/13 Edition 3 can be applied to existing PRIs that were designed and constructed to IGEM/TD/13 Edition 1 or 2, IGE/TD/9 or IGE/TD/10, but it may be necessary to continue some operations in accordance with those Recommendations. Where modifications are undertaken on these installations, consideration should be given to upgrading the installations to comply with IGEM/TD/13 Edition 3.

Note: There are no equivalent obsolete IGEM Standards for PRIs operating on LPG or LPG/air.

This Standard covers installations handling odorised or unodorised gases.

All pressures quoted 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".