What determines where a nozzle of a PV stops and the piping begins?
What determines where a nozzle of a PV stops and the piping begins?
(OP)
I know a nozzle is a component of a pressure vessel, what I am not clear on is where it stops being a nozzle and becomes piping.
Is it to the first joint regardless of the following connections?
Example; if the fist joint after the Cat "D" shell attachment weld is another weld and the following joint is a breakable conection such as a flange or threaded joint where does the piping start? Is it at the first welded joint or the breakable joint?
Can the nozzle include as many as three welded joints before a breakable joint and still be considered a nozzle?
Is it to the first joint regardless of the following connections?
Example; if the fist joint after the Cat "D" shell attachment weld is another weld and the following joint is a breakable conection such as a flange or threaded joint where does the piping start? Is it at the first welded joint or the breakable joint?
Can the nozzle include as many as three welded joints before a breakable joint and still be considered a nozzle?





RE: What determines where a nozzle of a PV stops and the piping begins?
From what I remember, there is some overlap to give the engineer/designer some room for buffer, i.e. at the connection/joint of piping to vessel (let's say at the PV"s nozzle for example), you may e.g. interpret the vessel's nozzle as both piping and PV. But, Im not 100% sure though.
RE: What determines where a nozzle of a PV stops and the piping begins?
RE: What determines where a nozzle of a PV stops and the piping begins?
RE: What determines where a nozzle of a PV stops and the piping begins?
RE: What determines where a nozzle of a PV stops and the piping begins?
Not sure what your talking about chicopee I'm not refering to boilers. If you meant pressure vessels how is it obvious to the in-service inspector who is not present or made aware of the instalation conditions of the pressure vessel?
RE: What determines where a nozzle of a PV stops and the piping begins?
RE: What determines where a nozzle of a PV stops and the piping begins?
I dont think that should be the case, but acc to the requirements of B31.3 for hydrostatic leak testing of piping, vessel nozzles and even complete vessels, for the scope of piping leak testing, may be regarded in the piping scope. So there are some 'exceptions'.
RE: What determines where a nozzle of a PV stops and the piping begins?
ZCP
www.phoenix-engineer.com
RE: What determines where a nozzle of a PV stops and the piping begins?
Generally, if a flange or nozzle is welded to a component(s) governed by VIII, Division I, then the flange or nozzle should also by governmened by VIII, Division I. If a pipe spool, or other removable component is in question, then the governing code should be determined by mutual agreement between all concerned parties.
-TJ Orlowski
RE: What determines where a nozzle of a PV stops and the piping begins?
RE: What determines where a nozzle of a PV stops and the piping begins?
For example I inspect many separators, scrubbers and contactors with this configuration so if the vessel is ever moved to a new location obviously the three component part of the nozzle goes with the vessel and new piping will be connected at the first flange or threaded joint.