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Maximum opening size on a blind flange; ASME BPV

Maximum opening size on a blind flange; ASME BPV

Maximum opening size on a blind flange; ASME BPV

(OP)
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?

RE: Maximum opening size on a blind flange; ASME BPV

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
 

RE: Maximum opening size on a blind flange; ASME BPV

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

http://www.xcalcs.com
Online tools for structural design

RE: Maximum opening size on a blind flange; ASME BPV

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).  

RE: Maximum opening size on a blind flange; ASME BPV

This links to an article on the Hartford Inspection website, written by Tom Pastor. Although these aren't the official words of the Code Committee I think we can take Mr. Pastor's words to the bank.

   http://www.hsbct.com/PressPtsNewsletrs/ppjune99.pdf

Tom

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