ASME B 16.47 Series B Blind Flange

Design and Purpose:

• • The Series B Blind Flange is a crucial component in piping systems.
  • It serves as a blind end cap, sealing off the end of a pipe or vessel.
  • Unlike other flanges, it has no opening or bore, making it ideal for closing off a pipeline or providing access for inspection and maintenance.
  • The blind flange is commonly used when a future connection point might be needed.

Dimensions:

• For Class 150 flanges (NPS 26-60), the dimensions of the ASME B16.47 Series B Blind Flange include:
  • • Outer Diameter (OD): Ranges from 660.4 mm (26 inches) to 1524 mm (60 inches).
    • Bolt Circle Diameter (K): Varies based on flange size.
    • Length through Hub (H): Varies based on flange size.
    • Number of Bolts: Ranges from 24 to 52.
    • Stud Bolt Diameter x Length: Typically 1.1/4 inches or 1.3/4 inches.
  • Raised Face Height: Depends on the pressure class of the flange.
  • These flanges are essential for maintaining the integrity of piping systems by securely sealing the endpoints.

Comparison with Series A:

• • Series B flanges require more but smaller fasteners, such as bolts and nuts.
  • They usually have a smaller bolt circle diameter than Series A flanges.
  • Generally, there is less flange movement after installation due to the smaller bolt circle diameter.
  • Both Series A and B define welding neck flanges and blind flanges in raised face type.