Industry Standard Update 106

British Standard 1949:2021 Specification for the installation of LPG systems for habitation purposes in leisure accommodation vehicles and accommodation purposes in other vehicles Date issued: 17 January 2022

This Industry Standard Update (ISU) provides an overview of the key areas of change arising from the revised British Standard 1949:2011+A1:2013 Specification for the installation of LPG systems for habitation purposes in leisure accommodation vehicles and accommodation purposes in other vehicles(2)

Introduction

During December 2021, BSI published a revised version of British Standard 1949:2021 Specification for the installation of LPG systems for habitation purposes in leisure accommodation vehicles and accommodation purposes in other vehicles(1). This supersedes the previous edition, published in April 2013.

The revision to this standard comes into effect by June 2022 at the latest, and conflicting national standards will be withdrawn at the latest by June 2023. Gas Safe Register will inspect to the revised standard by 1 December 2022: however, this should not restrict businesses from applying the specifications sooner.

The following is a brief overview of the areas of significant change to the revised BS EN 1949.

General

Legislation, normative, references and current standards have been updated throughout where necessary.

Second LPG systems

Clause 4.4 details to the requirements for where there is a second LPG system installed. The new standard states that where there is a second LPG system, a second manufacturer’s declaration of conformity is mandatory. It also now states that it is not permitted to have a second LPG system in a caravan holiday home.

Cylinder housing

Some of the clauses in section 5 (LPG cylinder housing) have been separated to give clearer guidance on the requirements for cylinder housings. One of the main changes comes in clause 5.1.7, which now states that the maximum allowable cylinder size for a compartment with internal access has been reduced from two cylinders of 16kg each to two cylinders of 11kg each.

Tank compartments

Section 6 is a new section on LPG tank compartments. This states that LPG tank compartments shall be sealed against accommodation spaces with external access only, and be designed so that access to any connections, pressure regulation system and changeover devices is not obstructed.

Electrical equipment in LPG cylinder compartments

The requirements around electrical equipment in cylinder compartments have been extended. Electrical equipment which is proofed for at least category II 3 G Ex IIA T2 is permitted in the compartment.

Slide-outs on road vehicles

A new section regarding slide-outs has been added (Section 10.3). This states that one or more LPG appliances are allowed in a slide-out, and that each slide-out installation shall be connected to the vehicle LPG installation by only one flexible hose. There must be a readily accessible shut-off valve no more than 500mm upstream of the hose connection, an excess flow device fitted, and the length of the hose must be as short as possible and no longer than 750mm.

The hose assembly shall be protected from stress, mechanical damage and overheating, be readily accessible, and shall not pass through walls, ceilings or floors. Downstream of the hose assembly, the pipework feeding the appliances shall be rigid. Each appliance needs to have individual shut-off valves installed.

LPG tanks

The section on LPG tanks and tank installations has been extended, and now includes guidance on the tightness testing of the tank and the installation between the tank and the tank filling point.

Annex

New Annex A includes a table giving the maximum flow rate of pressure regulators for caravan holiday homes by nation.

The previous Annex A is now Annex B. The previous Annex B has been removed.

Annex C has been updated and now includes examples of manufacturers’ declarations for both road vehicles and caravan holiday homes.

Summary As previously stated, 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 that they are fully apprised of all the requirements of the whole published standard and its practical application.

Bibliography 1. British Standard 1949:2021

Specification for the installation of LPG systems for habitation purposes in leisure accommodation vehicles and accommodation purposes in other vehicles This supersedes the previous edition

2. British Standard 1949:2011

+A1:2013 Specification for the installation of LPG systems for habitation purposes in leisure accommodation vehicles and accommodation purposes in other vehicles.