Flange Connection
Flange Connection
(OP)
In a flange connection, how many threads must be vacated after the nuts.
Thanks.
Thanks.
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RE: Flange Connection
ASME B31.3 335.2.3 says that one thread short of full engagement is acceptable. From a practical point, I like to see at least one thread past the face of the nut. It's much easier for an inspector to see.
Regards,
donf
RE: Flange Connection
Petrotrim Services
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RE: Flange Connection
Thanks.
I don't find the code aplicable for this it.
The two threads is an rule of thumb but this don't have support in the code.
Thanks.
RE: Flange Connection
The more threads you leave past the face of the nut the more threads there are to rust/corrode and bind, possibly ruining the nut.
prognosis: Lead or Lag
RE: Flange Connection
donf gave you the B31.3 requirement.
AWWA C207 required that "minimum bolt length shall be the sum of the mating flange maximum thicknesses, the gasket, and the depth of the nut plus 1/2" before torquing."
RE: Flange Connection
http://www.portlandbolt.com/faqs/recommendation-on...
http://www.woodcousa.com/q_a-r_54.htm
Petrotrim Services
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RE: Flange Connection
RE: Flange Connection
RE: Flange Connection
RE: Flange Connection
There are however other standards, and many references further explain that from a strength of materials or mechanical perspective far lesser engagement can normally develop full bolting strength. On the other hand, you may well need more protruberance for good reasons, e.g. when bolt and nut material vary or when tensioners are used etc.
RE: Flange Connection
RE: Flange Connection
RE: Flange Connection
I have a project many years ago that bolts to be tightened by bolt tensioner on many high pressure (>1000 psig, Div 2)vessels. The field contratcor told us the length to have one diameter minimum so the tensioner can grip on it. It is not a guessing. And it makes sense because normally the high of the nut is less than the diameter, so one diamter extra length is enough to engage the bolt tensioner. You can check with bolt tensioner supplier to confirm.
RE: Flange Connection