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IGEM - TD/4

PE and steel gas services and service pipework

active, Most Current
Organization: IGEM
Publication Date: 1 December 2022
Status: active
Page Count: 150
scope:

This Standard addresses Natural Gas (NG) services and Liquefied Petroleum Gas (LPG) service pipework. For the purposes of this Standard, the term "service" is used throughout and any requirements unique for LPG are identified by reference to LPG and not to "service pipework".

Note1: The European Standard BS EN 12007-5 describes the specific functional requirements for service lines in addition to the general functional requirements of EN 12007-1 for:

a) a maximum operating pressure (MOP) up to and including 16 bar;

b) an operating temperature between -20 °C and +40 °C.

It applies to their design, construction, commissioning, decommissioning, operation, maintenance, extension and other associated works. The service line is the physical asset comprising of pipework from the gas main branch saddle or top tee to the outlet of the distribution system operator's nominated point(s) of delivery (for example: isolation valve, regulator, meter connection or combination of regulator and isolation valve).

This Standard covers the design, construction, commissioning, decommissioning, inspection, testing, operation, maintenance and alteration of metallic and PE services for the provision of 2nd and 3rd family gases as defined in BS EN 437; mainly dry NG (predominantly methane) with or without odorisation and LPG.

All pipework laid in a highway outside of the property being supplied other than this predictable route shall be laid in accordance with IGEM/TD/3.

Note 1: The service line is the physical asset comprising of pipework from the gas main connection point to the outlet of the distribution system as defined in IGEM/G/1. It is recommended that service lines be routed as near perpendicular from the building as practicable from the point of entry of the property to the connection point and be located to minimise the risk of damage.

Note 2: For services within flats and other multi dwelling buildings, further procedures for NG are given in IGEM/G/5. Many of the principles therein will equally apply for LPG.

Note 3: For services within framed buildings, further procedures for NG are given in IGE/UP/7. Many of the principles therein will equally apply for LPG.

Note 4: For services to emergency control valves (ECVs) for permanently moored boats, caravans, holiday homes and residential park homes, further procedures are given in IGEM/G/6.

For NG, this Standard covers services of MOP not exceeding 7 bar and LPG not exceeding 2 bar in the vapour phase with operating temperatures of:

• Polyethylene (PE100) between 0ºC and 40ºC

• Polyethylene (PE80) between -20ºC and 40ºC

• steel between -25ºC and 40ºC.

Note 1: Consistent with European Standards, IGEM defines pressure regimes by specific pressure limits, rather than using such terms as "high, intermediate, medium and low pressure". In general, it also strives to avoid using the terms "main" and "service" but, in the United Kingdom (UK), these are terms still in common use.

In most cases, this will mean IGEM/TD/4 will apply between the ''distribution main'' (NG) or "bulk storage tank" (LPG) as covered by IGEM/TD/3, and the ECV denoting the end of the gas Network (see IGEM/G/1).

Note 2: This Standard does not specifically cover the construction of services of other materials. Engineers may consider alternatives brought about by advances in technology and proven concepts (see clause 1.8).

Note 3: NG pressure regulating installations (PRIs) for Networks are covered in IGEM/TD/13 and for meter installations in BS 6400-1, BS 6400-2, IGEM/GM/6 and IGEM/GM/8 respectively. Domestic LPG meter installations are covered in BS 6400-3.

This standard covers service pipes of diameters up to and including 2"/63 mm. Service pipes larger than 2"/63 mm diameter are to be laid in accordance with IGEM/TD/3.

Where service pipes are laid in excess of 2" / 63 mm diameter, this standard does cover building entries.

Note: IGEM/TD/3 does not address entry into buildings. Where a service pipe entering a building is designed and constructed in accordance with IGEM/TD/3, IGEM/TD/4 is considered to contain the appropriate requirements for the entry of that service pipe into that building. For entry into flats and other multi dwelling buildings, IGEM/G/5 additionally applies for NG (see also Note 2 to clause 2.2).

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 "shall" or "should".

Document History

TD/4
December 1, 2022
PE and steel gas services and service pipework
This Standard addresses Natural Gas (NG) services and Liquefied Petroleum Gas (LPG) service pipework. For the purposes of this Standard, the term “service” is used throughout and any requirements...
November 1, 2013
PE and steel gas services and service pipework
This Standard contains details of basic pipeline construction, installation and maintenance for gas services. These Recommendations address Natural Gas services and LPG service pipework. They cover...

References

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