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BSI PAS 4444:2020

BSI PAS 4444:2020

$78.10

Hydrogen-fired gas appliances. Guide

Published By Publication Date Number of Pages
BSI 2020 32
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This PAS gives guidance on the development and construction of hydrogen-fired gas appliances, which are either purpose-built to use hydrogen or are designed to be converted to use hydrogen.

The PAS covers the functional specification of the appliance, including specific advice on the demonstration of safety, including reasonably foreseeable conditions to stress the appliance in excess of that which it is likely to experience in normal service. It also covers the setting of limit (upper and lower) hydrogen supply pressures and limit voltages. It discusses the possible arrangement of fittings and devices acknowledging the application to hydrogen-fired appliances.

The PAS also covers tests regarding both delayed ignition and unintended ignition of accumulated gas (which has leaked from the gas circuit) within the case of the appliance and/or its flue.

It also covers advice on manufacturer’s instructions regarding installation of such appliances (including fluing) and their servicing requirements.

The PAS is intended to be used as a supplement to existing standards and generally assumes that any default performance requirements (for example, noise or pressure rating) align with those of an equivalent 2nd family gas appliance unless specifically stated otherwise.

The PAS also provides guidance on aligning with the essential requirements at the time of publication of the PAS of the Gas Appliance Regulation (GAR) for appliances burning hydrogen [1]. Annex A provides a list of these essential requirements and indicates where they are addressed in the clauses of this PAS.

This PAS has been developed with reference to the product standards given as normative references but might be applicable to other similar products (see Annex B).

This PAS is not applicable to industrial or process equipment.

This PAS is for use by the manufacturers of hydrogen-fired gas appliances and manufacturers of gas appliances that are designed to be converted to use hydrogen.

The PAS may also be of interest to Notified Bodies, other appliance test houses and anyone who might be engaged in testing these appliances.

NOTE 1 This PAS is intended to prepare the UK gas industry for “hydrogen ready” appliances, including appliances designed to be converted to use hydrogen.

NOTE 2 This PAS has been developed on the basis that currently hydrogen limit test gases do not exist and are to be the subject of a wider discussion. Accordingly, other test means have been suggested so as to stress the appliance in excess of that which it is likely to experience in normal service.

PDF Catalog

PDF Pages PDF Title
3 Contents
4 Foreword
5 1 Scope
6 2 Normative references
7 3 Terms, definitions, symbols and abbreviations
10 4 Classification
13 5 Construction
15 6 Performance
24 7 Markings and instructions
26 Annex A (informative)
Essential requirements of EU Regulation 2016/426
(“Gas Appliance Regulation”/”GAR”) [1]
27 Annex B (informative)
European legislation
28 Bibliography

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BSI PAS 4444:2020
$78.10