Class 150 F304/L Stainless Steel Weld Neck, Raised-Face Flange used with Schedule 40S Pipe
Class 150 F304/L Stainless Steel Weld Neck Raised-Face Flange for Schedule 40S Pipe
The Class 150 F304/L Stainless Steel Weld Neck Raised-Face Flange used with Schedule 40S pipe provides a strong, corrosion-resistant connection for demanding industrial piping systems. Manufactured to ASME A/SA182 and ASME B16.5 requirements, this flange combines forged stainless steel construction with a long tapered hub for dependable performance in pressure piping applications.
ASME A/SA182 F304/L Stainless Steel
ASTM A182 / ASME SA-182 F304/F304L stainless steel provides excellent general corrosion resistance, strength, durability, and fabrication characteristics. The lower carbon content of F304L helps minimize carbide precipitation during welding, making it particularly suitable for welded stainless steel piping systems.
Common applications include chemical processing, food and beverage production, pharmaceutical manufacturing, water treatment, power generation, utilities, and industrial process piping.
Weld Neck Flange for Schedule 40S Pipe
A weld neck flange features a tapered hub designed to transition gradually from the flange into the pipe. The flange is butt welded to compatible Schedule 40S stainless steel pipe, creating a strong, permanent connection and helping distribute mechanical stresses through the hub.
The flange bore should be properly matched to the Schedule 40S pipe wall thickness and inside diameter to promote smooth internal alignment and reliable welding.
The Class 150 designation represents an ASME pressure class, not a maximum working pressure of exactly 150 PSI. Actual allowable pressure depends on material, size, operating temperature, and applicable pressure-temperature ratings.
Raised-Face Flange Construction
The raised-face (RF) design incorporates an elevated gasket seating area that concentrates bolting force over the gasket to help establish an effective seal between compatible flanged components.
ASME B16.5 establishes applicable dimensional, facing, bolting, tolerance, and pressure-temperature requirements.
Selecting an F304/L Weld Neck Flange
When ordering, verify nominal pipe size, Schedule 40S bore, F304/F304L material, Class 150 rating, RF facing, ASME A/SA182 material specification, ASME B16.5 requirements, gasket, bolting, welding procedure, temperature, and process media.