BS 6891:2005+A2:2008
Installation of low pressure gas pipework of up to 35 mm (R1 1/4)in domestic premises (2nd family gas) - Specification

Standard No.

BS 6891:2005+A2:2008

Release Date

2005

Published By

British Standards Institution (BSI)

Status

Be replaced 2015-11

Replace By

BS 6891:2015

Latest

BS 6891:2015+A1:2019

Replace

00/705472 DC-2000 01/714747 DC-2001 05/30116741 DC-2005 BS 6891:1998 BS 6891:2005

Scope

This British Standard specifies design parameters, materials and methods of installing pipe, in sizes not exceeding R1¼ (32 mm) for steel and DN 32 for corrugated stainless steel or DN 35 for copper, gas pipework, for the supply of 2nd family gas from the meter to appliances in domestic dwellings. The standard is also applicable to polyethylene pipe up to DN 32 that is exterior to a dwelling. This standard applies to gas installation pipework where the nominal operating pressure is 21 mbar1). COMMENTARY AND RECOMMENDATIONS ON CLAUSE 1 Annex A shows a typical domestic gas installation (figures from the Gas Safety (Installation and Use) Regulations 1998 [1]). Steel pipework to BS 1387 of nominal size DN 32 is that size which is threaded to R1¼ (32 mm) in accordance with BS 21. The provision of service pipes to the consumer’s gas meter is covered by the Institution of Gas Engineers and Managers publication IGE/TD/4 [6]. The installation of gas meters is covered by BS 6400. 3rd family gas (liquefied petroleum gas) installations in permanent dwellings are covered in BS 5482-1. Gas installation pipework in larger sizes or at higher gas pressures is detailed in the Institution of Gas Engineers and Managers publication IGE/UP/2 [7]. Gas, as classified in BS EN 437:2003, Table 1, is normally supplied to the public in accordance with statutory requirements. The provisions of this standard apply to installations supplied with 2nd family gases including natural gas and mixtures of liquefied petroleum gases (LPG) and air. NOTE 1 For the purposes of this standard, installation includes design, inspection and commissioning. It is recognized that each of these tasks can be performed by the same person. NOTE 2 As well as normally constructed dwellings, domestic premises include any permanently sited caravans, holiday homes, residential park homes and permanently moored boats. Additional requirements exist for these categories of premises and can be found in IGE/UP/8 [8]. Neither this standard nor IGE/UP/8 [8] applies to gas installations in towed or motorized caravans. NOTE 3 Additional information on gas installations in timber frame dwellings is given in IGE/UP/7 [9].

BS 6891:2005+A2:2008 history

• 2019 BS 6891:2015+A1:2019 Specification for the installation and maintenance of low pressure gas installation pipework of up to 35 mm (R1¹₄) on premises
• 2015 BS 6891:2015 Specification for the installation and maintenance of low pressure gas installation pipework of up to 35 mm (R1?) on premises
• 2005 BS 6891:2005+A2:2008 Installation of low pressure gas pipework of up to 35 mm (R1 1/4)in domestic premises (2nd family gas) - Specification
• 2005 BS 6891:2005 Installation of low pressure gas pipework of up to 35 mm (R11/4) in domestic premises (2nd family gas) - Specification
• 1998 BS 6891:1998 Specification for installation of low pressure gas pipework of up to 28 mm (R1) in domestic premises (2nd family gas)