Piping Class Reference

Piping Class A1A Valve Specification

Piping Class A1A is the most common general-purpose carbon steel piping class used in utility and process service. ASME Class 150 rating covers water, steam, air, gases, and hydrocarbon service at moderate pressures. Widely specified by IOCL, BPCL, and EPC contractors for non-corrosive general service.

ASME Class

ASME Class 150

Design Pressure

16 bar (232 psi)

Design Temperature

Up to 200°C (392°F)

Body Material

Carbon Steel ASTM

Design Parameters — A1A

Fluid Service

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

Design Pressure

16 bar (232 psi)

Design Temperature

Up to 200°C (392°F)

Corrosion Allowance

3mm

Body Material

Carbon Steel ASTM A216 WCB

Industries

Refinery utilities, Power plant auxiliary

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 A1A

Valve Type	Rating	End Connection	Body Material	Trim	Seat/Sealing	Notes
Gate Valve	Class 150	RF Flange (ASME B16.5)	A216 WCB	13Cr	13Cr hard-faced	OS&Y, rising stem, bolted bonnet
Globe Valve	Class 150	RF Flange (ASME B16.5)	A216 WCB	13Cr	13Cr	T-pattern, bolted bonnet, OS&Y
Check Valve	Class 150	RF Flange (ASME B16.5)	A216 WCB	13Cr	13Cr	Swing type, bolted cover
Ball Valve (2" and below)	Class 150	Screwed/SW ends	A105 Forged	SS 316	PTFE	Floating ball, full bore
Ball Valve (3" and above)	Class 150	RF Flange (ASME B16.5)	A216 WCB	SS 316	PTFE	Trunnion or floating, full bore
Butterfly Valve	Class 150	Lug/Wafer (ASME B16.5)	A216 WCB / Ductile Iron	SS 316 disc	EPDM	Resilient seat, concentric
Y-Strainer	Class 150	RF Flange (ASME B16.5)	A216 WCB	SS 316 screen	–	3mm mesh, blow-off connection

Typical Industries — A1A

Refinery utilitiesPower plant auxiliaryGeneral processWater treatmentHVAC

Standard Certifications for A1A 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

A2A

ASME Class 300

Medium Pressure — Process, Steam, Hydrocarbons to 50 bar

B1A

ASME Class 150

Stainless Steel — Chemical, Corrosive, Pharmaceutical Service

C1A

ASME Class 150

Alloy Steel — High Temperature Steam and HP Service

All Piping Classes

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)

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