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Piping Class Reference

Piping Class F1A Valve Specification

Piping Class F1A covers Class 150 duplex 2205 stainless steel service for seawater injection, seawater cooling, brine, and chloride-containing process streams where carbon steel and 316 stainless steel both suffer accelerated corrosion. Duplex 2205 provides PREN (Pitting Resistance Equivalent Number) above 35, offering superior chloride pitting resistance compared to SS316 (PREN ~24). Used extensively in offshore platforms, FPSO seawater lift systems, desalination plants, and coastal refinery cooling water circuits. Vajra Industrial Solutions supplies Duplex 2205 (A890 4A cast / A182 F51 forged) ball, gate, butterfly, and globe valves to ASME Class 150 with full EN 10204 3.1 MTCs, ferrite content test, IGC (inter-granular corrosion) test, and NACE MR0175 compliance confirmation. Third-party inspection at manufacturer's works available.

ASME Class

ASME Class 150

Design Pressure

19.6 bar (284 psi) at 38°C (100°F)

Design Temperature

-29°C to +315°C (-20°F to +599°F)

Body Material

Duplex Stainless Steel

Design Parameters - F1A

Fluid Service

Seawater / Brine Service - Duplex 2205 Body, Class 150, PREN ≥35

Design Pressure

19.6 bar (284 psi) at 38°C (100°F)

Design Temperature

-29°C to +315°C (-20°F to +599°F)

Corrosion Allowance

0mm (duplex stainless, no corrosion allowance)

Body Material

Duplex Stainless Steel ASTM A890 Grade 4A / A182 F51 (Duplex 2205, UNS S31803/S32205)

Industries

Offshore Oil & Gas (seawater lift and injection), Desalination Plants (SWRO and MSF)

Reference Only - Project-Specific Verification RequiredThis piping class specification is a general industry reference. Actual piping class definitions vary by project and company standard (owner specifications). Always verify material, rating, and end-connection requirements against your project's official piping class datasheet or PMS (Piping Material Specification). Vajra Industrial Solutions accepts no liability for specification decisions based on this reference.

Valve Schedule - Piping Class F1A

Valve TypeRatingEnd ConnectionBody MaterialTrimSeat/SealingNotes
Ball ValveClass 150RF Flanged (ASME B16.5)A182 F51 Forged Duplex 2205Duplex 2205 / PTFE seatsPTFE or PEEK (NACE compliant)API 6D, fire-safe API 607; ferrite 40-60% per WPS; NACE MR0175
Gate ValveClass 150RF Flanged (ASME B16.5)A890 4A Cast Duplex 2205Duplex 2205 / Stellite 6 HF optionalDuplex 2205 HFAPI 600 / API 603; OS&Y; IGC test per ASTM A262 Pr A or E
Butterfly ValveClass 150Double Flanged (ASME B16.5 RF)A890 4A Cast Duplex 2205 / A182 F51 DiscDuplex 2205 disc + stemEPDM or PTFE (seawater rated)API 609 Category A/B; DNV Type Approval for offshore; AWWA C504
Globe ValveClass 150RF Flanged (ASME B16.5)A890 4A Cast Duplex 2205Duplex 2205 HFDuplex 2205 HFFlow throttling on seawater injection and de-oiling circuits

Typical Industries - F1A

Offshore Oil & Gas (seawater lift and injection)Desalination Plants (SWRO and MSF)FPSO / FLNG Seawater SystemsCoastal Refinery Cooling WaterMarine and Shipbuilding

Standard Certifications for F1A Valves

ASME B16.34API 6DAPI 607 (Fire Safe)API 608EN 10204 3.1ISO 9001:2015IBR (Indian Boiler)API 598 Testing

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Related Piping Classes

B1A

ASME Class 150

Stainless Steel - Chemical, Corrosive, Pharmaceutical Service

B3A

ASME Class 600

High-Pressure Stainless - Corrosive Process, Sour Hydrocarbons with SS316 Body

All Piping Classes

A1A - ASME Class 150A2A - ASME Class 300A3A - ASME Class 600B1A - ASME Class 150B2A - ASME Class 300C1A - ASME Class 150D1A - ASME Class 150E1A - ASME Class 150 (Cryogenic)A4A - ASME Class 900A5A - ASME Class 1500A6A - ASME Class 2500B3A - ASME Class 600D2A - ASME Class 600E2A - ASME Class 300

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