nozzle thickness

[mdischarge]

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

 

[dtn6770]

Nope, ASME Sec. VIII wise.

 

[zjliang]

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

 

[jte]

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

 

[GenB]

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

 

[LSThill]

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!!!