Check Valves for Marine & Offshore Service
Trunnion ball valves, butterfly valves and gate valves in Super Duplex (F53) and Duplex (F51) for FPSO, offshore topsides, subsea wellheads, and marine seawater service.
Which check valves are used for marine & offshore service?
Offshore oil and gas platforms, FPSOs, subsea wellheads, and marine vessels present the most aggressive corrosion environment in industry: high-chloride seawater, saline atmosphere, cyclic wave loading, and continuous hydrocarbon exposure. Valves in these applications demand Super Duplex (UNS S32750/F53) or Duplex (UNS S31803/F51) stainless steel, compliance with NORSOK M-710 qualification testing, DNV-OS-D101 marine system requirements, and full NACE MR0175 sour service documentation.
Swing / Tilting Disc Check Valve (Marine Grade)
Non-return valve on seawater lift pumps, ballast systems, and produced water injection
Critical Requirements
- Super Duplex (UNS S32750/S32760) or Duplex (UNS S31803) for all seawater-wetted surfaces - PREN ≥40 for super duplex
- NORSOK M-710 elastomer qualification testing for FPSO and North Sea applications
- NACE MR0175 / ISO 15156 compliance for sour (H₂S-containing) produced fluids
- DNV-OS-D101 or Lloyd's Register certification for marine system valves
- API 607 fire-safe design for hydrocarbon-carrying valves on offshore topsides
- Cathodic protection compatibility - valves on submerged structures require galvanic compatibility
Service Challenges
- Seawater (high chloride, microbiologically influenced corrosion) - standard SS 316 is insufficient; duplex or super duplex required
- Produced water (oil + water + H₂S + CO₂ + chlorides) - combined NACE and duplex material requirement
- Sour crude with H₂S - sulphide stress cracking; hardness-controlled NACE materials mandatory
- Seawater injection for EOR - high-pressure, high-chloride; super duplex and NORSOK qualification
- Marine atmosphere (salt spray, humidity) - external coating system: zinc primer + epoxy + polyurethane topcoat (NORSOK M-501)
Vajra Check Valves
Non-return valves to prevent backflow and protect equipment in piping systems.
See the full Check Valves rangeOther valves for marine & offshore service
Check Valves for other applications
Connected Engineering
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