Studded opening fabricated from bar (UG-14)
Studded opening fabricated from bar (UG-14)
(OP)
Hello,
It seems as though every time I try and make sense of a specific paragraph in ASME VIII-1 I am left wanting for clearer writing...
Here's my newest question regarding UG-14:
Scenario: due to lead times, I've been asked by the fabrication shop if we can fabricate a studded opening from bar material rather than plate. The studded opening is per Fig. UG-40(a-2) with the following dimensions: 5.25"OD x 1.7"ID c/w drilled/tapped holes and facing to match a 1.5" 150# flange.
UG-14(b) states that bar stock can be used for hollow cylindrically shaped parts up to and including NPS4 (DN100) provided some conditions on metal flow lines are met. So, considering the studded opening design above, would you consider this a 1.5 NPS part, or would you compare the 5.25" OD to the OD of a 4 NPS pipe (4.5")?
Follow-up questions:
a) If we are comparing OD's, why doesn't the code just say the parts must be 4.5" OD or less... this would be must clearer?
Thank you!
Marty
It seems as though every time I try and make sense of a specific paragraph in ASME VIII-1 I am left wanting for clearer writing...
Here's my newest question regarding UG-14:
Scenario: due to lead times, I've been asked by the fabrication shop if we can fabricate a studded opening from bar material rather than plate. The studded opening is per Fig. UG-40(a-2) with the following dimensions: 5.25"OD x 1.7"ID c/w drilled/tapped holes and facing to match a 1.5" 150# flange.
UG-14(b) states that bar stock can be used for hollow cylindrically shaped parts up to and including NPS4 (DN100) provided some conditions on metal flow lines are met. So, considering the studded opening design above, would you consider this a 1.5 NPS part, or would you compare the 5.25" OD to the OD of a 4 NPS pipe (4.5")?
Follow-up questions:
a) If we are comparing OD's, why doesn't the code just say the parts must be 4.5" OD or less... this would be must clearer?
Thank you!
Marty





RE: Studded opening fabricated from bar (UG-14)
'So, considering the studded opening design above,..', your item remains a flange which is excluded from using rod or bar material.
Cheers,
gr2vessels
RE: Studded opening fabricated from bar (UG-14)
Is there a typo or are you two talking about two different sections?
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RE: Studded opening fabricated from bar (UG-14)
RE: Studded opening fabricated from bar (UG-14)
Regards,
Mike