PD CEN TR 17924-2025 PDF

Full title and description

STB PD CEN TR 17924:2025 — Safety and control devices for burners and appliances burning gaseous and/or liquid fuels — Guidance on hydrogen specific aspects. This CEN Technical Report provides guidance for adapting safety, design, construction, performance requirements and test procedures of safety and control devices when used with hydrogen-containing fuels (from low-percentage H2 blends to 100 % H2).

Abstract

This Technical Report (CEN/TR 17924:2025) summarises hydrogen-specific considerations for safety and control devices used on burners and appliances that burn gaseous and/or liquid fuels. It addresses how existing requirements and test methods may be applied or need modification for hydrogen and hydrogen–natural gas blends, including practical guidance for manufacturers, test laboratories, notified bodies and national standards organizations. The document was prepared by CEN/TC 58 with the aim of supporting normative revisions and national adoptions.

General information

• Status: Current / Definitive text made available (DAV).
• Publication date: Early 2025 (CEN finalisation Feb 2025; national adoptions reported March–June 2025 — e.g. UNE endorsement in March 2025, TNI/STB listing May 2025, DIN publication notices June 2025).
• Publisher: CEN (European Committee for Standardization) — prepared by CEN/TC 58; national standards bodies publish/adopt national versions (examples: UNE, DIN, TNI/SK).
• ICS / categories: 23.060.40 (Pressure regulators / safety & control devices for burners and fuel-burning appliances).
• Edition / version: 2025 (CEN Technical Report — TR).
• Number of pages: 89 pages (typical published PDF / national adoption documents report 89 pages).

Scope

CEN/TR 17924:2025 gives guidance on hydrogen-specific aspects relevant to safety and control devices for burners and appliances burning gaseous and/or liquid fuels. It considers application ranges from low-percentage hydrogen blends (e.g., H2–NG mixtures) up to 100 % hydrogen, and addresses devices with declared inlet pressures up to ~500 kPa and nominal sizes up to DN 250 where relevant. The report is intended to support the review and, where necessary, revision of existing normative standards within the CEN/TC 58 work program.

Key topics and requirements

• Hydrogen-related combustion and safety hazards relevant to control and safety devices (ignition, flame stability, leakage, materials compatibility).
• Assessment of existing test methods and where adaptation is needed for hydrogen and H2–NG blends.
• Design and construction considerations (materials, seals, lubricants, and component selection for H2 exposure).
• Performance criteria and functional testing for safety/regulating devices when exposed to hydrogen-containing fuels.
• Recommendations for declarations of suitability (e.g., “H2-ready” ratings), marking and documentation for devices intended for hydrogen or hydrogen blends.
• Guidance for national adoption and for the future revision of normative standards in the CEN/TC 58 portfolio.

Typical use and users

Manufacturers of safety and control devices (pressure regulators, valves, safety shut-offs, control systems), test and certification laboratories, notified bodies, appliance and burner manufacturers, installers and service organizations, gas network operators, and national standards committees will use this TR to evaluate and demonstrate suitability of devices for hydrogen service and to inform product design, testing and national regulation updates.

Related standards

Relevant normative references and related standards include other CEN/TC 58 documents and EN standards covering burners and gas appliances (examples frequently referenced in the sector: EN 126, EN 88, EN 161, EN 298) as well as national adoptions (UNE, DIN, UNI, STN/SRPS). CEN/TR 17924 is intended to inform revisions to these and related documents where hydrogen-specific changes are needed.

Keywords

Hydrogen, H2, hydrogen blends, burners, gas appliances, safety devices, control devices, pressure regulators, H2‑ready, CEN/TR 17924, CEN/TC 58.

FAQ

Q: What is this standard?

A: CEN/TR 17924:2025 is a CEN Technical Report providing guidance on hydrogen-specific aspects for safety and control devices used with burners and appliances that burn gaseous and/or liquid fuels. It is a non‑normative guidance document produced by CEN/TC 58.

Q: What does it cover?

A: It covers assessment and adaptation of design, materials, performance requirements and tests for devices (e.g., regulators, safety shut-off valves, controls) when used with hydrogen or hydrogen–natural gas blends, up to application ranges noted in the report (including guidance for high H2 concentrations and typical declared inlet pressures).

Q: Who typically uses it?

A: Device and appliance manufacturers, test houses and certification bodies, notified bodies, installers, gas network operators, and national standards committees — essentially stakeholders involved in product design, conformity assessment and national implementation.

Q: Is it current or superseded?

A: CEN/TR 17924:2025 is the current Technical Report edition (2025). Some national adoptions list the 2025 TR as the definitive text; national bodies may note earlier iterations (e.g., 2023 draft or previous TR editions) as superseded by the 2025 TR. Check the national standards body for the exact adoption/supersession statement in your country.

Q: Is it part of a series?

A: It sits within the CEN/TC 58 family of documents addressing safety and control devices for burners and appliances; it is a Technical Report (guidance) intended to support and inform normative standards in the same domain rather than being a standalone mandatory product standard.

Q: What are the key keywords?

A: Hydrogen, H2 blends, H2-ready, safety devices, control devices, burners, gas appliances, pressure regulators, CEN/TR 17924:2025.