Blind Flange
The blind flange (BF) does not have a bore. It is used to blind off a flange or even a valve. When used at the end of a pipe or fitting, it provides an easy to open access for further extension of the pipe. The blind flange and its bolts are stressed more than any other flange. This flange has a raised face.
- ASME B16.5 are 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
This is the size differences between a 150 to 2500, 4″ blind flange (BF).
- Series A / MSS SP-44
- Flange – Blind, ANSI Class 75, B16.47 Series B
- Flange – Blind, ANSI Class 75, Industry Standard (For SOF)
- Flange – Blind, ANSI Class 75, Industry Standard (For WNF)
- Flange – Blind, ANSI Class 150, B16.47 Series A
- Flange – Blind, ANSI Class 150, B16.47 Series B
- Flange – Blind, ANSI Class 150, B16.5
- Flange – Blind, ANSI Class 150, B16.5 RJF
- Flange – Blind, ANSI Class 250, Industry Standard
- Flange – Blind, ANSI Class 300, B16.47 Series A
- Flange – Blind, ANSI Class 300, B16.47 Series B
- Flange – Blind, ANSI Class 300, B16.5
- Flange – Blind, ANSI Class 300, B16.5 RJF
- Flange – Blind, ANSI Class 350, Industry Standard
- Flange – Blind, ANSI Class 400, B16.47 Series A
- Flange – Blind, ANSI Class 400, B16.5
- Flange – Blind, ANSI Class 400, B16.5 RJF
- Flange – Blind, ANSI Class 600, B16.47 Series A
- Flange – Blind, ANSI Class 600, B16.5
- Flange – Blind, ANSI Class 600, B16.5 RJF
- Flange – Blind, ANSI Class 900, B16.47 Series A
- Flange – Blind, ANSI Class 900, B16.5
- Flange – Blind, ANSI Class 900, B16.5 RJF
- Flange – Blind, ANSI Class 1500, B16.5
- Flange – Blind, ANSI Class 1500, B16.5 RJF
- Flange – Blind, ANSI Class 2500, B16.5
- Flange – Blind, ANSI Class 2500, B16.5 RJF