Check Valves for Synthesis Gas (Syngas - CO + H₂) Service

Which check valves configuration suits Synthesis Gas (Syngas - CO + H₂) (CO + H₂), in which material, to which standard — from real service data, with the pitfalls flagged.

Which check valves for Synthesis Gas (Syngas - CO + H₂)?

Check Valve - Prevention of reverse syngas flow on compressor discharge Typical service window: 20–350 barg (SMR reformer to high-pressure synthesis loop), 200–900°C (reformer outlet) down to ambient in downstream sections.

Recommended Configurations

Check Valve

Prevention of reverse syngas flow on compressor discharge

Body Material for Synthesis Gas (Syngas - CO + H₂)

Rated from real compatibility data - click any material for the full decision page.

SS 316LExcellent for syngas at all conditions; austenitic SS not susceptible to HE.Excellent Carbon SteelAcceptable for lower partial pressure H₂ service per API 941 Nelson curves. PWHT mandatory.Good A217 WC6 / WC9Low-alloy Cr-Mo steel per Nelson curves for high-temperature syngas.Good Nickel alloys (Inconel 625)Avoid in high CO partial pressure - risk of nickel carbonyl formation above 150°C.Fair Duplex 2205Not recommended for high-H₂-partial-pressure above 50 barg without NACE review.Fair

Governing Standards for Synthesis Gas (Syngas - CO + H₂) Service

API 941 (Nelson curves for H₂ service)ASME B16.34 NACE MR0103 API 600PED 2014/68/EUISO 9001:2015

What to Avoid in Synthesis Gas (Syngas - CO + H₂) Service

High-strength steel valves (>90 ksi TS) not validated to NACE MR0103
Nickel-trim valves in high-CO partial pressure above 150°C

Service Considerations

API 941 Nelson curve compliance mandatory for all C-Mn and Cr-Mo steel valves in syngas H₂ service
PWHT (post-weld heat treatment) mandatory for all weld-end syngas valves
CO monitoring mandatory in control rooms - all valve maintenance on CO lines requires breathing apparatus
Fugitive emission control critical - CO is odourless and toxic at very low concentrations

Other valve types for Synthesis Gas (Syngas - CO + H₂)

Gate Valves for Synthesis Gas (Syngas - CO + H₂)Globe Valves for Synthesis Gas (Syngas - CO + H₂)Ball Valves for Synthesis Gas (Syngas - CO + H₂)Safety & Relief Valves for Synthesis Gas (Syngas - CO + H₂)

Check Valves for other services

Check Valves for High-Pressure Steam Check Valves for Carbon Dioxide (CO₂)Check Valves for Diesel Fuel / Fuel Oil Check Valves for Cooling Water Check Valves for Methanol (Methyl Alcohol)Check Valves for Hot Oil (Thermal Heat Transfer Fluid)Check Valves for MEG / Glycol (Monoethylene Glycol - Gas Dehydration)Check Valves for Demineralised Water (DM Water / Deionised Water)

Reviewed by Process Engineering, Vajra Industrial SolutionsDiscipline: Process & Fluid Service EngineeringLast reviewed: 20 June 2026

Connected Engineering

Standards

ASME B16.34 NACE MR0175

Products

Check Valves

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Relevant Products

Vajra Check Valves

Engineering references

Synthesis Gas (Syngas - CO + H₂) service guideFull compatibility, standards & considerations Vajra Check ValvesFull range, specs & standards Spec Check engineValidate this spec before the RFQ