Industry Standard Update 124

IGEM/G/6 Edition 2 Gas supplies to mobile dwellings
Date issued: 3 September 2024

This Industry Standard Update provides an overview of the key areas of change arising from the revision of IGEM/G/6 Gas supplies to mobile dwellings.

Introduction
In July 2024, IGEM/G/6 Edition 2⁽¹⁾ Gas supplies to mobile dwellings (Communication 1862) was released. The revised procedure supersedes IGEM/G/6⁽²⁾ Gas supplies to mobile dwellings (Communication 1728), which has been withdrawn. The revision to this standard comes into effect immediately. The following is a brief overview of the amendments made in the update to IGEM/G/6.

Scope
It is now clarified that the nominal operation pressure for LPG installations downstream of any emergency control valve (ECV) is to be 37mbar.

Legislation
The powers devolved to Scotland, Wales and Northern Ireland means that there may be variations to the legislation described in the document, and consideration of their requirements may be necessary.

Main document
Table 2 relating to the required competence for welding of steel pipes has been removed and replaced with guidance to refer to IGEM/UP/2⁽³⁾ Installation Pipework in Industrial and Commercial Premises for acceptance criteria.

The Note in Section 4.2.2 has added the consideration for possible flooding of the area around storage vessels.

Section 4.6.3 states that all cylinder installations with fixed pipework downstream of the cylinder hoses shall incorporate an OPSO device to prevent excess pressure from entering the property.

Temperature-compensated meters should be considered for all LPG installations, as now stated in Section 5.1.3.

The minimum distance from a regulator relief vent tip to any electrical equipment shall be as follows:
• Natural gas meter box with a supply pressure greater than 75 mbar shall be at least 1550mm
• LPG meter box with a supply pressure greater than 75 mbar shall be at least 850mm.

Section 6.1.5 states that where movement is greater than 2m and a flotation device is fitted to a dwelling, longer hoses may be permitted, subject to adequate documented design and risk assessment, and only a single hose shall be used.

The option of a stainless-steel hose manufactured to BS EN ISO 10380 has been added to the list of suitable hoses in the Note in Section 6.1.6 for flexible connection.

IGEM/G/6 Ed 2 is available here.

Note: This Industry Standard Update is only a brief overview of the information contained in the amended standard. Registered businesses should be aware that they have a responsibility to ensure they are fully apprised of all the requirements of the whole published standard and their practical application.

Bibliography
(1)       IGEM/G/6 Ed 2 Gas supplies to mobile dwellings (Communication 1862)
(2)       IGEM/G/6 Gas supplies to mobile dwellings (Communication 1728)
(3)       IGEM/UP/2 Ed 3 Installation Pipework in Industrial and Commercial Premises (Communication 1771)