MINIMUM NOZZLE SIZE
MINIMUM NOZZLE SIZE
(OP)
What is the minimum size of nozzle that can be
welded to any pressure vessel? As part of good
engineering practice, we usually take 2 inch as the
minimum size for any pressure vessel. Is there any
clause in ASME Code that refers to this matter?
welded to any pressure vessel? As part of good
engineering practice, we usually take 2 inch as the
minimum size for any pressure vessel. Is there any
clause in ASME Code that refers to this matter?





RE: MINIMUM NOZZLE SIZE
Some problems with small nozzles are the attachment welds and the actual physical strength of the nozzle under external loads. We try to use a Flanged Pipet or Weld-O-Let if possible.
I would suspect that the limit to 2" nozzle is based on a strength requirement to prevent damage.
RE: MINIMUM NOZZLE SIZE
RE: MINIMUM NOZZLE SIZE
unclesyd- I can't think of any nozzles (of any size) which I've seen which are made of CS or low alloy pipe and Sch 40: With any CA it would be hard to meet UG-45(b)(4), though you could argue that the 12.5% tolerance provides some CA...
jt
RE: MINIMUM NOZZLE SIZE
Where smaller nozzles get a little tricky is like in one of our processes where the process material will freeze or plate out on the walls if the velocity isn't kept up. So sometimes small is good.
RE: MINIMUM NOZZLE SIZE