What is the design pressure for piping class D2A valves?

Piping class D2A is rated for a design pressure of 99.3 bar (1440 psi) at 38°C (100°F) at a design temperature of -46°C to +425°C (-51°F to +797°F). Fluid service: Sour / H₂S Service - NACE MR0175 Compliant Carbon Steel, Class 600. Corrosion allowance: 3mm.

What valve types are specified in piping class D2A?

Piping class D2A includes: Gate Valve, Globe Valve, Ball Valve, Check Valve. All valves are to ASME Class 600 rating with Carbon Steel ASTM A352 LCC (Low Temperature CS) with NACE MR0175/ISO 15156 Compliance body material.

What body material is required for piping class D2A?

The body material for piping class D2A is Carbon Steel ASTM A352 LCC (Low Temperature CS) with NACE MR0175/ISO 15156 Compliance. This is selected for Sour / H₂S Service - NACE MR0175 Compliant Carbon Steel, Class 600 service at 99.3 bar (1440 psi) at 38°C (100°F) and -46°C to +425°C (-51°F to +797°F).

Which industries use piping class D2A?

Piping class D2A is typically used in: Sour Gas Processing Plants, H₂S-containing Upstream Oil & Gas, Sour Water Strippers in Refineries, Amine Treating Units (Lean/Rich Amine), Acid Gas Removal Units. Vajra Industrial Solutions supplies all valve types to D2A specification with full EN 10204 3.1 material certificates, hydrostatic test certificates, and dimensional inspection reports.

Home Piping ClassesD2A

Piping Class Reference

Piping Class D2A Valve Specification

Piping Class D2A covers Class 600 sour service (H₂S) at moderate temperatures, typically in gas processing, upstream oil & gas, and sour water strippers where H₂S partial pressure exceeds NACE MR0175 threshold. A352 LCC is used to combine low-temperature toughness (-46°C) with NACE compliance (22 HRC max hardness). All trim must be NACE-compliant. Stem packing must be graphite or PTFE; metallic components below the packing must meet hardness limits. NACE MR0103 compliance required for refinery environments. Vajra Industrial Solutions supplies complete D2A piping class valve packages with NACE MR0175/ISO 15156 compliance certificates, HIC test reports for plate components, and H₂S service declarations. All items supplied with EN 10204 3.1 MTCs with certified hardness data.

ASME Class

ASME Class 600

Design Pressure

99.3 bar (1440 psi) at 38°C (100°F)

Design Temperature

-46°C to +425°C (-51°F to +797°F)

Body Material

Carbon Steel ASTM

Design Parameters - D2A

Fluid Service

Sour / H₂S Service - NACE MR0175 Compliant Carbon Steel, Class 600

Design Pressure

99.3 bar (1440 psi) at 38°C (100°F)

Design Temperature

-46°C to +425°C (-51°F to +797°F)

Corrosion Allowance

3mm

Body Material

Carbon Steel ASTM A352 LCC (Low Temperature CS) with NACE MR0175/ISO 15156 Compliance

Industries

Sour Gas Processing Plants, H₂S-containing Upstream Oil & Gas

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 D2A

Valve Type	Rating	End Connection	Body Material	Trim	Seat/Sealing	Notes
Gate Valve	Class 600	RTJ Flanged (ASME B16.5)	A352 LCC (NACE)	SS316 / 13Cr (Trim 12)	SS316 HF (22 HRC max per wetted parts)	API 600, NACE MR0175 compliant; H2S service declaration
Globe Valve	Class 600	RTJ Flanged	A352 LCC (NACE)	SS316 HF (controlled hardness)	SS316 HF	BS 1873 / API 603; graphite packing; NACE trim materials
Ball Valve	Class 600	RTJ Flanged or BW	A352 LCC Forged / A182 F60 Duplex if Cl- present	SS316 + ENP, NACE compliant	NACE PEEK / Metal seat	API 6D, DBB; NACE MR0175 body + trim; hardness certificate
Check Valve	Class 600	RTJ Flanged or BW	A352 LCC (NACE)	SS316 NACE compliant	SS316 HF (NACE)	API 594; swing or dual plate; NACE compliant springs and internals

Typical Industries - D2A

Sour Gas Processing PlantsH₂S-containing Upstream Oil & GasSour Water Strippers in RefineriesAmine Treating Units (Lean/Rich Amine)Acid Gas Removal Units

Standard Certifications for D2A Valves

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

Shop Valves for Piping Class D2A

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Check Valves

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Related Piping Classes

A3A

ASME Class 600

High Pressure - Refinery, HP Steam, Oil & Gas to 100 bar

D1A

ASME Class 150

Sour Service - H₂S Containing Hydrocarbons, NACE MR0175

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 D1A - ASME Class 150 E1A - ASME Class 150 (Cryogenic)A4A - ASME Class 900 A5A - ASME Class 1500 A6A - ASME Class 2500 B3A - ASME Class 600 E2A - ASME Class 300 F1A - ASME Class 150

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