Class 150 Forged Carbon Steel Weld Neck, Flat-Face Flange for Schedule 40 Pipe
Class 150 A105/SA-105 Weld Neck Flat-Face Flange for Schedule 40 Pipe
The Class 150 ASTM A105/ASME SA-105 Forged Carbon Steel Weld Neck Flat-Face Flange for Schedule 40 Pipe provides a strong, permanent connection for industrial pressure piping systems. Combining forged carbon steel construction, a tapered weld neck, Schedule 40 bore, and flat-face sealing surface, this flange delivers dependable strength and long-term performance in commercial and industrial piping applications.
ASTM A105 / ASME SA-105 Forged Carbon Steel
Manufactured from ASTM A105 / ASME SA-105 forged carbon steel, this Class 150 weld neck flange offers excellent mechanical strength, toughness, and durability. A105/SA-105 is commonly specified for pressure-containing components used in oil and gas, petrochemical processing, refineries, power generation, chemical processing, manufacturing, utilities, and industrial process piping systems.
The Class 150 designation represents an ASME pressure class rather than a maximum working pressure of 150 PSI. Actual allowable pressure depends on material, operating temperature, and the applicable pressure-temperature rating.
Weld Neck Design for Schedule 40 Pipe
A weld neck flange features a long tapered hub that creates a gradual transition between the flange body and connecting pipe. The flange is butt welded directly to Schedule 40 pipe, producing a strong permanent joint while helping distribute mechanical stresses through the tapered hub.
The flange bore can be machined to correspond with the Schedule 40 pipe wall thickness and inside diameter, providing proper internal alignment at the butt-weld connection.
Flat-Face Flange Construction
The flat-face (FF) flange has a gasket seating surface extending across the entire flange face without the elevated sealing area found on a raised-face flange. Proper gasket selection and a compatible mating flange are important for achieving a reliable connection.
Class 150 A105/SA-105 weld neck flanges are commonly manufactured to applicable ASME B16.5 requirements.
When ordering, verify nominal pipe size, Schedule 40 bore, Class 150 rating, flat-face configuration, A105/SA-105 material, dimensions, and service conditions for accurate fit and dependable industrial piping performance.