Full Description

This document is written in preparation of future revision of standards dealing with the general safety,design, construction, and performance requirements and testing of safety, control or regulating devices(hereafter referred to as controls) for burners and appliances burning hydrogen (see 3.2) or hydrogenadmixtures (see 3.3).

This document refers to controls with declared maximum inlet pressure up to and including 500 kPa and of nominal connection sizes up to and including DN 250.

The purpose of this document is to provide guidance on hydrogen specific topics, which need to beconsidered in the future standardization of controls covered by CEN/TC 58 documents including:
— automatic shut-off valves;
— automatic burner control systems;
— flame supervision devices;
— gas/air ratio controls;
— pressure regulators;
— manual taps;
— mechanical thermostats;
— multifunctional controls;
— pressure sensing devices;
— valve proving systems;
— automatic vent valves.

Hydrogen will play a significant role in the future in several energy segments and requirements and test methods need to be verified and adapted, if necessary.

The main target of this document is to lay the ground for defining requirements and tests for controlsused for safety related functions (e. g., safety valves, automatic burner control systems, gas/air ratiocontrols) or regulating devices.

Summaries of subclauses to be addressed in the respective standards of each CEN/TC 58 WG are given in
— Annex A: Specific considerations to CEN/TC 58/WG 11 standards,
— Annex B: Specific considerations to CEN/TC 58/WG 12 standards,
— Annex C: Specific considerations to CEN/TC 58/WG 13 standards, and
— Annex D: Specific considerations to CEN/TC 58/WG 14 standards.

Aspects to be included for gas appliances (e. g., boilers, forced draught gas-burners, or industrialthermoprocessing equipment) covering e. g., risk assessment, standardization, certification, andoperation are listed in
— Annex E: Risk assessment, standardization, certification, and operation of gas appliances withadmixtures fluctuating up to 20 vol.-% hydrogen to natural gas, and
— Annex F: Risk assessment, standardization, certification, and operation of gas appliances usinghydrogen referring to ISO 14687:2019, Type I, Grade A.

Proposals for leakage rate requirements and tests for gas pipework including controls (e. g., valves,regulators, pressure switches) used in gas appliances (e. g., forced draught gas-burners or industrialthermoprocessing equipment) and the impact on the installation room size are shown in Annex G.

Considerations to be taken to stay below possible lower explosion limits in gas appliances (e. g., boilers, forced draught gas-burners, or industrial thermoprocessing equipment) and its installation rooms areshown in
— Annex H: Examples of mitigation measures in case of diaphragm fracture or fracture of non-metallicparts for different combustible gases to stay below 25 % of their LEL, based on measurements andcalculations, and
— Annex I: Examples of mitigation measures in case of leakages for different combustible gases to stay below 25 % of their LEL, based on measurements and calculations.

Product Details

Published:

02/28/2025

ISBN(s):

9780539281163

Number of Pages:

90

File Size:

1 file , 2.3 MB

Note:

This product is restricted and cannot be purchased in the following countries Ukraine, Russia, Belarus