UG-45 minimum nozzle thickness
UG-45 minimum nozzle thickness
(OP)
For what stand-out length of nozzle does this requirement apply? For what outer length a nozzle is still been defined as a nozzle?
Does this length limited to the UG-37 Limit of Reinforcement (2.5t or 2.5 tn+te)?
How about threaded or Victaulic connections? Are these types permitted when remained thickness at connection's area does not comply with UG-45?
Thank you for your help!
Does this length limited to the UG-37 Limit of Reinforcement (2.5t or 2.5 tn+te)?
How about threaded or Victaulic connections? Are these types permitted when remained thickness at connection's area does not comply with UG-45?
Thank you for your help!





RE: UG-45 minimum nozzle thickness
As for UG-45 minimum thickness, this would apply to the entire nozzle length. Essentially where it changes from vessels scope as a nozzle to piping scope.
If I remember correctly these requirements are based upon the fact that small nozzles are typically used for climbing on or around the vessels.
RE: UG-45 minimum nozzle thickness
I believe that the par. limits calculated nozz. reinforcing,
beyond 2.5tn
RE: UG-45 minimum nozzle thickness
jt
RE: UG-45 minimum nozzle thickness
RE: UG-45 minimum nozzle thickness
Regards,
Mike
RE: UG-45 minimum nozzle thickness
How would you consider a nozzle made of a pipe with external threaded end? What is the minimum wall thickness required under thread? Is it acc. to UG-27 or acc. to UG-45?
Does the following requirement apply also for nozzles?
"UG-31 (2): Where ends are threaded, additional wall thickness is to be provided in the amount of 0.8 /n in. (20/n mm)"
What is the meaning of "additional wall thickness"? What is the basic min. thickness it added to?
RE: UG-45 minimum nozzle thickness
If the end of the nozzle is threaded, the thickness available for either calculation is the minor diameter after the threads are cut. I don't see any other way to calculate the minimum required thickness.
Also, be sure that you keep UG-16 in mind. Although it is unlikely to impack a nozzle it is an area that seems to be missed all too often.
EJL
RE: UG-45 minimum nozzle thickness
Regards,
Mike
RE: UG-45 minimum nozzle thickness
I have not seen this done in years, but then again, most plants don't allow it anyway.
anyway, the minimum wall thickness...std wt plus ca or shell min thick plus ca....is anywhere in the nozzle.
code does not say that it stops anywhere.
on couplings, I use only 6000# threaded couplings, when client uses couplings, because the wall thickness under the threads is large enough to meet the minimum wall thickness and there is les distortion when welding into shell. And we use many extended length weld in couplings to get the threads outside of insulation and away from shell attachment welds
sometimes it is the little things that make a quality vessel.