Modification of pipe nipples

[GCross1985]

Hi guys,

I currently ran across a situation where a 6" TBE nipple was cut in half and used as two 3" TOE nipples. Is this acceptable to ASME B31.1 code? Or is this considered modification of a fitting?

Also I have noticed that a threaded end nipple was welded into a socket welded elbow. I know that ASME B31.1 allows for seal welding as long as the threads are completely covered. However, I am not sure if this is considered a threaded joint, with only one of the mating components being threaded.

Any comments appreciated.

Thanks

 

[pennpiper]

GCross1985,
You asked:
I currently ran across a situation where a 6" TBE nipple was cut in half and used as two 3" TOE nipples. Is this acceptable to ASME B31.1 code? Or is this considered modification of a fitting?
A pipe Nipple is NOT a pipe fitting. It is a piece of pipe. We cut pipe all the time. We do not have to ask permission to do it or seek allowance from some Code.

Also I have noticed that a threaded end nipple was welded into a socket welded elbow. I know that ASME B31.1 allows for seal welding as long as the threads are completely covered. However, I am not sure if this is considered a threaded joint, with only one of the mating components being threaded.
This is not normally done but, depending on the Commodity (Low risk), the Operating Pressure (Low), the Operating Temperature (Low) and consideration for the justification (Lack of alternate material) I might allow it. You need to talk to your Project AI (Authorized Inspector) and the Client who would have the last word.


Sometimes its possible to do all the right things and still get bad results

 

[GCross1985]

Thank you Pennpiper for your helpful advise.