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nozzle thickness

nozzle thickness

nozzle thickness

(OP)
is there any ristriction to use a naozzle thicker than shell thickness?

RE: nozzle thickness

Nope, ASME Sec. VIII wise.

RE: nozzle thickness

In some cyclic services, higher grade LWNs have thicker wall than shell. So it is not supposed to be a problem.

RE: nozzle thickness

Not only no restrictions, it is commonly done. One extreme would be integrally reinforced heavy wall nozzles, in between are long weld neck nozzles, and then there's the VIII Div. 1 mandated Standard wall minimum (UG-45) which instantly becomes XS or Sch 40 or Sch 60 with any corrosion allowance. You may have a vessel with 0.0625" corrosion allowance shell fabricated of 0.375" plate but if you attach a 12" nozzle the minimum allowable thickness for the nozzle would be 0.4375" which kicks you into a XS nozzle which is 0.500" thick. So just to meet code you shall have a nozzle thicker than the shell.

jt

RE: nozzle thickness

in fact the nozzles are most always thicker than the shell, or not!

RE: nozzle thickness

TECHNICAL NOTE:

Additional Load: Piping treat the vessel nozzle as an anchor. Piping Stress: Fx,Fy,Fz,Mx,My,Mz WRC 107, WRC 297 WRC 368, WRC 497. RE: API/ASME 597. and FSF!!!

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