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
What is piping class Piping Class D2A?
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.
- ASME Class:
- ASME Class 600
- Service:
- Sour / H₂S Service - NACE MR0175 Compliant Carbon Steel, Class 600
- Body Material:
- Carbon Steel ASTM A352 LCC (Low Temperature CS) with NACE MR0175/ISO 15156 Compliance
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
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
Standard Certifications for D2A Valves
Shop Valves for Piping Class D2A
Related Piping Classes
All Piping Classes
Engineering references
Connected Engineering
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