Name Plate(s) for Vessel

[22west]

Gents,

I have a vessel made of three sections, an end cap (head, cylinder and flange) , a spool (cylinder and two flanges) and another end cap.

The three sections are assembled with two bolted connections.

All three sections see the same pressure, however, due to the nature of the internal process, each section is exposed to a different temperature and are rated as such.

With the different rated temperature, how does one best label this vessel?

1) One label for each section (three labels).
2) One label for the complete assembly.
3) Other method.

 

[CodeRef]

22West,
If ASME Section VIII-1, comply with UG-116(i), (j), (k), and (l) and additionally utilize the Remarks section of the Manufacturer's Data Report. Within the above paragraphs, a mention of UG-19(a)(2) is also referenced. I think you will find your answers there.
Also consider using the optional U-DR forms now available in ASME Section VIII-1 2008 Edition, Nonmandatory Appendix KK.
If ASME, What does your AI or AIA say?

 

[doct9960]

22west,

When you say "rated temperature", do you mean design temperature? What are the design temperatures of the vessel and what are the materials?

 

[gr2vessels]

22west,
The vessel as presented by you appears to be interconnected, hence the highest temperature can be seen by all three sections (obviously depending on the vessel specification you forget to mention). You have mentioned the operating conditions, but not mentioned the design conditions.
1. If you have three design conditions, that means you have three independent pressure vessels, disregarding of their connection;- that means you have to provide three different name plates for each section with their own design conditions.
2. If you have an interconnecting pressure vessel which will see different operating conditions in various sections, you will have to decide the design conditions for the interconnecting items, like the flanges you mentioned;- I doubt it very much that you can convince anyone that your interconnected girth flanges will operate at different temperature conditions and as such you can use different design conditions (please ask yourself what design temperature will you use for the sizing of the bolts???). However, it is You the only judge of the correctness of design conditions you establish.
3. In my view, based on the limited and somehow confusing data you presented, I believe that you should design all the sections for the highest / most onerous conditions and present the vessel with the most conservative MAWP and the corresponding nameplate.
Cheers,
gr2vessels

 

[LilianB]

We have experience on this, what we did is one label for one whole assembly.