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ASME Sec. 1 - Alignment tolerance

ASME Sec. 1 - Alignment tolerance

ASME Sec. 1 - Alignment tolerance

(OP)
We are welding new bottle headers into the second pass of the secondary superheater. I wanted to confirm alignment tolerances according to the code. But I cannot find anything that specifically references "Headers". Part PW-33 is for shells and vessels (including pipe or tube used as a shell).

The joint design is a compound bevel starting out at 37.5 degrees for 3/4 of an inch and then tapering to a 10 degree bevel the rest of the way out. The headers are 1.750" thick. If the base metal thickness at the weld is 1.750" , according to that table - you're allowed 1/8t which is .21875 ( 7/32" ). That seems excessive to me for a GTAW root & SMAW fill and cap. Am I missing something ?

Even for tube or pipe as per PW-34.1 , It says alignment shall be such as to provide complete joint penetration. To me if you have a good enough welder , as long as you burn into the bevels you can be completely misaligned.



I attached a sketch of the joint design. Thank you for your time

RE: ASME Sec. 1 - Alignment tolerance

why 18 deg taper is provided upto id ?

RE: ASME Sec. 1 - Alignment tolerance

(OP)
this is a picture of the existing bottle header that we are welding our new one to. The existing one is 5" I.D and the new one is 5.125" I.D. They have to match them up by machining an 1/8" out of the existing.

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