Misalignment of nozzle-to-header joint : any tolerance ?

[aburafdi]

Dear all,
Refer to thread292-290132 (misalignment of tube to header weld). In this thread it was answered by Metengr that such misplace / misalignment of joint between tube and header is a non-conformance. I fully understand this. Now my question : is there any tolerance on how much the mis-alignment is still considered acceptable ?
For example : I have nozzle to header joint. The nozzle is NPS 4 Sch XXS - grade91, header NPS 8 Sch 160 - grade91. Is misalignment of 8 mm (0.31") still acceptable ?

 

[MJCronin]

abura...

Fabrication tolerances for piping and pressure vessels are not contained within the codes. They are a commercial matter to be resolved between the purchaser and the supplier

For pressure vessel fabrication tolerances, the pressure vessel handbook contains some good information:

http://www.inspection-for-industry.com/pressure-vessel-handbook.html

Engineering companies also develop thier own standards.... I have some older versions.

Also, reportedly, you can also refer the PD 5500 Annex L

http://65.57.255.42/ubbthreads/ubbthreads.php?ubb=showflat&Number=21838

Hope that this helps.....

Let us know about your final call on this matter....

 

[pennpiper]

Mr New MJCronin's statement is correct "Fabrication tolerances for piping and pressure vessels are not contained within the codes."
However there is a widely accepted "Standard"

The Pipe Fabrication Institute "PFI ES3" Covers Fabrication Tolerances.

Go here for a complete list of all PFI Standards

http://www.pfi-institute.org/products.php

prognosis: Lead or Lag

 

[aburafdi]

MJcronin and pennpiper,
I appreciate your advice. I think I need to learn more about this.
As for now, we decided to cut and replace the nozzle with a new one.

 

[XL83NL]

Ive always found the PFI standards a great resource for tools, so to say.
Does anyone know of a (PFI or other) standard for tolerances on VIII-1 vessels, other than whats listed in VIII-1 w/ respect to tolerances?