Piping Class Reference
Piping Class B3A Valve Specification
Piping Class B3A covers ASME Class 600 stainless steel service - the standard high-pressure stainless piping class used in refinery process units handling corrosive hydrocarbons, HCl traces, organic acids, and wet gas streams where carbon steel is unsuitable. Class 600 CF8M provides 99.3 bar allowable at ambient temperature, stepping down to ~63 bar at 400°C. Valve end connections are predominantly RTJ flanged or butt-weld in larger sizes. All trim is SS316 or better; graphite packing for high-temperature service. Vajra Industrial Solutions supplies A351 CF8M cast gate, globe, check, and ball valves to ASME Class 600 with API 6D and ASME B16.34 compliance. Full EN 10204 3.1 MTCs, hydrostatic test per API 598, dimensional inspection reports, and PMI standard.
ASME Class
ASME Class 600
Design Pressure
99.3 bar (1440 psi) at 38°C (100°F)
Design Temperature
-29°C to +540°C (-20°F to +1004°F)
Body Material
Stainless Steel ASTM
Design Parameters - B3A
Fluid Service
High-Pressure Stainless - Corrosive Process, Sour Hydrocarbons with SS316 Body
Design Pressure
99.3 bar (1440 psi) at 38°C (100°F)
Design Temperature
-29°C to +540°C (-20°F to +1004°F)
Corrosion Allowance
0mm (stainless, no corrosion allowance)
Body Material
Stainless Steel ASTM A351 CF8M (Cast SS316) / A182 F316 Forged
Industries
Petroleum Refining (corrosive crude fractions), Petrochemical Plants
Valve Schedule - Piping Class B3A
| Valve Type | Rating | End Connection | Body Material | Trim | Seat/Sealing | Notes |
|---|---|---|---|---|---|---|
| Gate Valve | Class 600 | RTJ Flanged (ASME B16.5) or BW (ASME B16.25) | A351 CF8M (SS316) | SS316 (Trim 12) | SS316 HF | API 603, OS&Y, flexible wedge; IBR Form III-C if steam |
| Globe Valve | Class 600 | RTJ Flanged or BW | A351 CF8M (SS316) | SS316 HF | SS316 HF | API 603 / BS 1873; T-pattern or Y-pattern; graphite packing |
| Ball Valve | Class 600 | RTJ Flanged (ASME B16.5) or BW | A351 CF8M / A182 F316 Forged | SS316 ENP + PEEK | PEEK / Metal seat (fire-safe) | API 6D, trunnion; API 607 fire-safe; NACE if H2S traces present |
| Check Valve | Class 600 | RTJ Flanged or BW | A351 CF8M (SS316) | SS316 | SS316 HF | API 594 dual plate or swing type; full bore |
| Butterfly Valve | Class 600 | Double Flanged (ASME B16.5 RTJ) | A351 CF8M / A182 F316 Disc | SS316 disc + stem | Metal seat (PEEK or SS316 HF) | Triple offset, API 609 Category B; fire-safe API 607 |
Typical Industries - B3A
Standard Certifications for B3A Valves
Shop Valves for Piping Class B3A
Related Piping Classes
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