Weld Neck Flange
The weld neck flange (WNF) comes in two types, regular and long. The hub of the weld neck is designed to reduce the stress at the base of the flange. Regular weld neck flanges are used with buttweld fittings and long weld neck flanges are usually used with equipment and vessel nozzles. A long weld neck flange is rarely used with pipe. Both types of flanges are bored to match the inside diameter of the pipe or fitting to which it will be welded to. They are suitable where high pressure, extreme temperatures, shear impact and vibratory stresses apply. This flange has a raised face.
This is the size differences between a 150 to 2500, 4″ weld neck flange (WNF).
- ASME B16.5 are flanges for sizes 1/2″ to 24″.
- ANSI/ASME B16.36 are orifice flanges for sizes 1/2″ to 24″.
- ASME B16.47 Series A and B are large diameter flanges for sizes 26″ to 60″.
- Series A / MSS SP-44
- For general use
- Bolt circle diameter is larger than Series B
- NOT interchangeable
- Series B / API Std 605 (cancelled)
- For compact use
- Bolt circle diameter is smaller than Series A
- NOT interchangeable
- Series A / MSS SP-44
- Flange – Weld Neck, ANSI Class 75, Industry Standard
- Flange – Weld Neck, ANSI Class 150, B16.47 Series A
- Flange – Weld Neck, ANSI Class 150, B16.5
- Flange – Weld Neck, ANSI Class 150, B16.5 RJF
- Flange – Weld Neck, ANSI Class 300, B16.36
- Flange – Weld Neck, ANSI Class 300, B16.47 Series A
- Flange – Weld Neck, ANSI Class 300, B16.5
- Flange – Weld Neck, ANSI Class 300, B16.5 RJF
- Flange – Weld Neck, ANSI Class 400, B16.36
- Flange – Weld Neck, ANSI Class 400, B16.47 Series A
- Flange – Weld Neck, ANSI Class 400, B16.5
- Flange – Weld Neck, ANSI Class 400, B16.5 RJF
- Flange – Weld Neck, ANSI Class 600, B16.36
- Flange – Weld Neck, ANSI Class 600, B16.47 Series A
- Flange – Weld Neck, ANSI Class 600, B16.5
- Flange – Weld Neck, ANSI Class 600, B16.5 RJF
- Flange – Weld Neck, ANSI Class 900, B16.36
- Flange – Weld Neck, ANSI Class 900, B16.5
- Flange – Weld Neck, ANSI Class 900, B16.5 RJF
- Flange – Weld Neck, ANSI Class 1500, B16.36
- Flange – Weld Neck, ANSI Class 1500, B16.5
- Flange – Weld Neck, ANSI Class 1500, B16.5 RJF
- Flange – Weld Neck, ANSI Class 2500, B16.36
- Flange – Weld Neck, ANSI Class 2500, B16.5
- Flange – Weld Neck, ANSI Class 2500, B16.5 RJF