Valves for Hydrogen (H₂) Service
Hydrogen is the smallest molecule — extreme permeation tendency, wide flammability range (4–75%), and susceptibility to hydrogen embrittlement in high-strength steels. Valve selection must prioritise fire-safe design, metal-to-metal seating, and embrittlement-resistant materials.
Pressure Range
0.1–700 bar (process to HP storage)
Temperature
-253°C (liquid H₂) to 550°C (reformer)
Industries
Green hydrogen production, Hydrogen refuelling stations, Ammonia production
Key Properties — Hydrogen (H₂)
- Flammability range: 4–75% in air
- Auto-ignition: 500°C — but can ignite on sudden decompression
- Hydrogen embrittlement: affects high-strength steels, especially >690 MPa
- Permeation through polymers — PTFE and PEEK preferred for seals
- Colourless, odourless — requires specialised detection
Material Compatibility — Hydrogen (H₂)
Ratings are indicative. Actual compatibility depends on concentration, temperature, velocity, and presence of contaminants. Always consult corrosion tables or a materials engineer.
| Material | Rating | Notes |
|---|---|---|
| SS 316L | Good | Standard for hydrogen service. Austenitic SS has low susceptibility to HE. |
| Duplex 2205 | Fair | Risk of HE at high pressure. Verify per ISO 11114-4. |
| Inconel 625 / 718 | Excellent | Excellent HE resistance for high-pressure HP service. |
| Carbon Steel (low hardness) | Fair | Max 22 HRC per NACE MR0175 for sour/H₂ service. Not for HP hydrogen. |
| High-strength steel (>690 MPa) | Not Recommended | Severe HE risk — never use hardened steels in hydrogen service. |
| PTFE | Excellent | Preferred seal material — lowest permeation rate. |
| PEEK | Excellent | Superior to PTFE at elevated temperature hydrogen service. |
| Nitrile NBR | Poor | High permeation rate — not acceptable for high-pressure H₂. |
Recommended Valves
SS 316L metal-seated ball valve (fire-safe)
H₂ infrastructure — API 6D fire-safe design with PEEK seats
Inconel 625 gate valve
High-pressure HP (700 bar) hydrogen — refuelling stations
Bellows-sealed globe valve
Zero stem leakage — critical for high-purity H₂ process
Anti-static ball valve
Hydrogen is extremely flammable — antistatic device essential
Valves to Avoid
High-strength steel bodied valves (HRC > 22)
NBR or EPDM seated valves — high permeation
Non-fire-safe valves in any H₂ service
Valves with dead-leg pockets where H₂ can accumulate
Special Considerations
Applicable Standards
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