Minimum nozzle projection to first weld from vessel?
Minimum nozzle projection to first weld from vessel?
(OP)
Working on an ASME vessel alteratation, adding a 10" sch 160 nozzle in the top of a 2:1 ellipitical head.
What would be considered a reasonable minimum distance between the weld on the shell to the next weld on the nozzle?
We are in a very tight space. Some on the project feel that having a nominal 2 to 3" long nozzle projection from the head is acceptable.
The head material is SA516-60 normalized and welding will be 100% radiographed, nozzle SA-106-B
What would be considered a reasonable minimum distance between the weld on the shell to the next weld on the nozzle?
We are in a very tight space. Some on the project feel that having a nominal 2 to 3" long nozzle projection from the head is acceptable.
The head material is SA516-60 normalized and welding will be 100% radiographed, nozzle SA-106-B





RE: Minimum nozzle projection to first weld from vessel?
For the minimum distance between weld toes you should be looking for a minimum of 2 x nozzle neck thickness, ie 2 x 28.6 mm = 57.2 mm, say 57 mm. If you add the head to nozzle weld thickness and the nozzle to flange weld thickness, plus the flange thickness and the 57 mm, you are looking for some 135 mm for a slip-on flange class 150#, more for any other arrangement or class.
Cheers,
gr2vessels
RE: Minimum nozzle projection to first weld from vessel?
RE: Minimum nozzle projection to first weld from vessel?
Daddy, just be aware that you have to remove sometimes the flange bolting!
Cheers,
gr2vessels
RE: Minimum nozzle projection to first weld from vessel?
RE: Minimum nozzle projection to first weld from vessel?
Joe Tank
RE: Minimum nozzle projection to first weld from vessel?
S. Bush
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