GB4962-2008
Technical safety regulation for gaseous hydrogen use
氢气使用安全技术规程
GB 4962-2008 is a current mandatory Chinese national standard for Technical safety regulation for gaseous hydrogen use. It appears in the Machinery compliance cluster with a product safety focus and has an implementation date of Oct 1, 2009.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
GB 4962-2008 applies to ground-based facilities involving the use, displacement, storage, compression, and filling of gaseous hydrogen. It covers safety technical requirements for fire protection, emergency handling, and safety protection. This standard is not applicable to liquid hydrogen, marine gaseous hydrogen, aviation hydrogen sites, or onboard vehicle hydrogen supply systems. Relevant stages of hydrogen production may refer to this standard.
Technical requirements
The standard specifies comprehensive safety requirements for hydrogen systems, focusing on building layout and fire separation distances between hydrogen stations and other facilities. It mandates that hydrogen stations must be independent single-story structures with a fire resistance rating of no less than Level II, and strictly prohibits setting up hydrogen stations in basements or semi-basements. Facilities must ensure proper ventilation to maintain hydrogen concentration in air below 1% (volume). For equipment and piping, the standard requires the use of seamless metal pipes, explicitly banning cast iron pipes. It specifies that piping connections should use welding or other leak-proof methods, and valves should preferably be ball or globe valves. All electrical equipment in explosion hazardous areas must be explosion-proof (Class II, Category C, T1 group), and systems must be equipped with overpressure relief valves and hydrogen leak alarms. The standard details purging and displacement procedures to safely remove hydrogen from systems before maintenance. It requires the use of inert gases with an oxygen volume fraction not exceeding 3%, and mandates that hydrogen content must be reduced to 0.4% or below before any hot work can commence. Hot work requires written approval from the safety department. Regarding storage and filling, it outlines requirements for hydrogen cylinders, tube trailers, and storage tanks. Cylinders must be color-coded light green with red lettering, and full/empty cylinders must be stored separately. The filling process must use anti-misconnection fittings to prevent mixing with oxidizing gases, and hydrogen and oxygen must not be filled on the same platform.
Testing methods
The standard mandates specific testing and verification procedures, including pressure and leak tightness tests for newly installed or overhauled hydrogen systems, and hydrostatic testing for storage tanks at 1.5 times the maximum working pressure. It requires continuous gas analysis during purging operations, specifying acceptable thresholds for oxygen and hydrogen fractions. Additionally, it outlines periodic inspection requirements for safety valves, pressure gauges, and lightning protection devices, along with specific protocols for leak detection using neutral soapy water or portable combustible gas detectors.
FAQs
What products and facilities are regulated under GB 4962-2008?
GB 4962-2008 applies to ground-based facilities involving the use, displacement, storage, compression, and filling of gaseous hydrogen. It does not apply to liquid hydrogen, marine, aviation, or onboard vehicle hydrogen supply systems.
Are there any mandatory updates from the previous version of GB 4962-2008?
Yes, this version replaces GB 4962-1985. Key updates include modified fire separation distances for hydrogen filling stations, revised requirements for hydrogen supply settings and cylinder usage, and the addition of new chapters on displacement and emission management. Chapters 4 through 9 are designated as mandatory.
How does GB 4962-2008 address explosion prevention?
The standard mandates strict explosion prevention measures, including the use of explosion-proof electrical equipment (Class II, Category C, T1) in hazardous areas, strict control of ignition sources, and continuous monitoring of hydrogen concentrations. Facilities must ensure hydrogen content in the air does not exceed 1% by volume.
The summary above provides a high-level overview of GB 4962-2008. To ensure complete compliance for your products and facilities entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 4962-2008 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Safety
- CCS
- G86
- ICS
- 71.100.20
- Competent department
- Ministry of Emergency Management
- Technical committee
- National Technical Committee on Work Safety of Standardization Administration of China
Relationships
Replaces:GB 4962-1985