Class 150 Forged Carbon Steel Weld Neck, Raised-Face Flange for Schedule XH Pipe
Class 150 A105/SA-105 Weld Neck Flange for Schedule XH Pipe
The Class 150 ASTM A105/ASME SA-105 Forged Carbon Steel Weld Neck Raised-Face Flange for Schedule XH Pipe provides a strong, dependable connection for heavy-wall industrial pressure piping. Designed for Schedule XH (Extra Heavy) pipe, this forged carbon steel flange combines a tapered weld neck, schedule-matched bore, and raised-face sealing surface for reliable industrial piping performance.
ASTM A105 / ASME SA-105 Forged Carbon Steel
Manufactured from ASTM A105 / ASME SA-105 forged carbon steel, this Class 150 weld neck flange delivers excellent mechanical strength, toughness, and durability. A105/SA-105 is widely specified for pressure-containing piping components used in oil and gas, petrochemical processing, refineries, power generation, manufacturing, utilities, and industrial process systems.
The Class 150 designation identifies an ASME pressure class, not a maximum operating pressure of 150 PSI. Allowable pressure depends on material, operating temperature, and applicable pressure-temperature ratings.
Weld Neck Flange for Extra Heavy Pipe
A weld neck flange incorporates a tapered hub that provides a gradual transition from the flange body to the connecting pipe. The flange is butt welded directly to the Schedule XH pipe, creating a permanent connection and helping distribute mechanical stresses through the hub.
The Schedule XH bore is designed to correspond with applicable Extra Heavy pipe dimensions. XH dimensions correspond with Schedule 80 in many common pipe sizes, but exact dimensions should always be verified.
Raised-Face Flange Design
The raised-face (RF) flange features an elevated gasket seating surface that concentrates bolting load over the gasket area, helping create an effective seal between compatible mating flanges.
When ordering a Class 150 A105/SA-105 weld neck raised-face flange for Schedule XH pipe, verify nominal pipe size, XH wall thickness, flange bore, facing, material specification, and applicable dimensional standard. Proper selection helps ensure accurate bore alignment, reliable sealing, and dependable long-term performance in heavy-wall carbon steel piping systems.