Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Maximum opening size on a blind flange; ASME BPV 1

Status
Not open for further replies.

jserpas

Mechanical
Nov 4, 2002
2
US
Where can I find out what is the maximum opening size I can make on a 'regular' blind flange (say, 3"-300#) and on a 'hubbed' blind flange?
 
Replies continue below

Recommended for you

If you go over the standard opening sizes - you will have to recalculate the flange in accordance with ASME VIII, because you will be out of the limits of B16.5

Regards,

Gerald


 
You should go to UG-36(c)(3): the upper limit for openings not requiring reinforcement is 2 3/8 in. for the finished (corroded) opening diameter.
Of course this will make a big hole in a 3" flange, but if you consider that the blind thickness is the same as the thickness of the flange... prex

Online tools for structural design
 
Check out Table 7 in ASME B16.5. This table is titled Reducing Threaded and Slip-On Flanges for Classes 150 to 2500. The table gives the smallest size of reducing outlet from the "blind" flange that requires a hub for each pipe size through 24" NPS. Threaded and slip-on connections are both covered. If you want to have some other kind of connection or have a flange larger than 24" NPS you will probably need to calculate per ASME VIII-1 (UG-39, Appendix 2, & Appendix 14).

 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top