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  1. David19

    Missing / broken stud in 8"x600 # flange joint

    LittleInch - We can't replace it simply, since spare valve is not availalbe and threads that got ripped are in valve body. geesamand - Yes, the preload shall increase on all remaining studs and more specifically to adjacent nearbuy studs. This is 8"x600 # butterfly valve with four threaded...
  2. David19

    Missing / broken stud in 8"x600 # flange joint

    Hi; One of the cap screw's threads got ripped off during final torqueing of 8"x600# Butterfly valve between flange joints. Can this piping system be operated with remaining 11 studs. What is the gasket seat force required to maintain the flange joint integrity ? Thanks in advance,
  3. David19

    Need to drill a hole in blind flange to weld pipe

    Thank TGS4 and Moltenmetal for your suggestion. Unfortunately, reducing flange or hubbed flange is not an option. So, for solution per option through Section VIII, div 1; does it require a typical flange design to meet this specific custom requirement ? Any more details, clause, equation from...
  4. David19

    Need to drill a hole in blind flange to weld pipe

    Need to weld 2" SCH 80 A106-GrB pipe by drilling a hole on 3"x150# A105N blind flange. Per B16.5, table 6; allowable smallest size of hole for 3" blind flange is 1 1/4". Is there any way (in B31.3 or ASME VIII) than can support this modification ? Operating pressure/temp is 5 bar and 130 Deg C...

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