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Nipoflanges, Flange olets, Long Weld Neck Flanges

Nipoflanges, Flange olets, Long Weld Neck Flanges

Nipoflanges, Flange olets, Long Weld Neck Flanges

A question has been raised if the below picture is considered a nipoflange or flange olet? It appears to be on long weld neck flange that has been beveled and installed on on 20" main header.
1. Is this a nipflange or flange olet
2. Besides the incompleted weld would this be exceptable per B31.3
A. If not acceptable why? The thickness of the pipe is the entire thickness of a weldolet and would appear to be stronger.
3. It could possibly be a bad manufacture that is calling it a nipoflange per the MTR, in which it is a long weld neck flange.

ANy feedback we would great.

RE: Nipoflanges, Flange olets, Long Weld Neck Flanges

Pressure Vessel or piping subforum is much better choice- better to repost it there.

Use translation assistance for Engineers forum

Note the rules include No Student posting

RE: Nipoflanges, Flange olets, Long Weld Neck Flanges

Looks like a nipolfange, 300#, Sch 160 body or Sch 40, hard to see. A Long Weld Neck would not have any Schedule. Acceptable in B31.3 within the Temp/Pressure Ratings for 300# SA-350-LF2 CL.1

RE: Nipoflanges, Flange olets, Long Weld Neck Flanges

Its hard to determine if all of this is correct.

First, the type of fitting needs to be known I think. Then, using the rules from para 304 in B31.3 for branches, you can determine if this weld is acceptable (one option is this is an intergally reinforced fitting (like per MSS SP-97), which could waive calcs for reinforcement zone). Keep in mind that the design conditions may play a role here to determine if the weld is acceptable (it may e.g. need a fillet).

Without knowing all this, I would suspect this weld is unacceptable.

And why is corner profile welded to it? This would make a nice tress riser

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