Piping Class Reference

Piping Class D1A Valve Specification

Piping Class D1A is the sour service carbon steel piping class for H₂S-containing hydrocarbon streams. All wetted metal hardness is controlled to ≤22 HRC per NACE MR0175/ISO 15156 to prevent Sulphide Stress Cracking (SSC). Mandatory for oil production, sour gas, and refinery SRU service.

ASME Class

ASME Class 150

Design Pressure

16 bar (232 psi)

Design Temperature

Up to 200°C (392°F)

Body Material

Carbon Steel WCB

Design Parameters — D1A

Fluid Service

Sour Service — H₂S Containing Hydrocarbons, NACE MR0175

Design Pressure

16 bar (232 psi)

Design Temperature

Up to 200°C (392°F)

Corrosion Allowance

3mm + NACE hardness limit

Body Material

Carbon Steel WCB / ASTM A216 with NACE MR0175 hardness control

Industries

Sour oil and gas production, Oil well completion

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 D1A

Valve Type	Rating	End Connection	Body Material	Trim	Seat/Sealing	Notes
Gate Valve	Class 150	RF Flange	A216 WCB (NACE)	13Cr (NACE limited hardness)	13Cr HF (≤22 HRC)	NACE MR0175 compliant; hardness certs required
Ball Valve	Class 150	RF Flange	A216 WCB (NACE)	SS 316 (NACE)	PTFE / RPTFE	API 6D, fire-safe, antistatic, NACE MR0175
Check Valve	Class 150	RF Flange	A216 WCB (NACE)	13Cr (NACE)	13Cr HF	NACE hardness cert mandatory
Plug Valve	Class 150	RF Flange	A216 WCB (NACE)	NACE-compliant	Teflon/Fluoropolymer	Non-lubricated plug valve for sour gas service

Typical Industries — D1A

Sour oil and gas productionOil well completionGas gathering (sour)SRU (Sulphur Recovery)Sour water stripper

Standard Certifications for D1A 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

A1A

ASME Class 150

General Service — Water, Air, Steam up to 16 bar

A2A

ASME Class 300

Medium Pressure — Process, Steam, Hydrocarbons to 50 bar

All Piping Classes

A1A — ASME Class 150 A2A — ASME Class 300 A3A — ASME Class 600 B1A — ASME Class 150 B2A — ASME Class 300 C1A — ASME Class 150 E1A — ASME Class 150 (Cryogenic)

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