Use of Non-ASME Standard Flanges in Pressure Vessels

[Mani]

Dear Experts,

Can we use EN 1092-1 flanges in an ASME U-Stamp vessel?
Is there any provision in ASME Div. 1 to use these flanges and how to set temp-pressure rating?
Thank you.

 

[pdiculous963]

Assuming the material is allowed per VIII-1, then run calculations in accordance with Appendix 2 to establish a pressure temperature rating.

 

[Jano6924]

Take a look into Table U-3 and UG-44 in ASME VIII-1 for accepted standards.

Regards.

 

[Mani]

/Dear pdiculous963,

Material is SA 105, We will set pressure temperature rating as per appendix 2.. Does ASME VIII Div. 1 permit use of dimensional standard other than ASME?

Dear Jano6924,

EN 1092-1 is not referred in Table U-3 and UG-44.

Is there any other solution?

Regards.

 

[XL83NL]

manidubai: your last question is answered by the first reply you got. IMO, thats the only solution if you need to construct vessels to ASME (stamp).
ASME VIII-1 doesnt allow other materials than those listed in II-D, unless you apply for a code case.

just to be sure, you have SA105 flanges that conform to the requirements of the EN 1092-1 standard? sounds weird ...

 

[Jano6924]

As XL83NL correctly states, if you need to use EN 1092-1 flanges and vessel shall be stamped, then the only solution is to design flanges per Appendix 2 of ASME VIII-1. SA-105 is listed in table UCS-23.

I agree on that using EN 1092-1 flanges on an ASME stamped vessel sounds weird.

However, you can choose to use ASME B16.5 or B16.47 flanges IF permitted by vessel specification and local regulations. In such case you can use pressure-temperature ratings listed in these standards.

Hope this helps.

 

[Mani]

XL83NL and Jano6924,
Thanks for your reply.
Let me elaborate more to make easy.
We have a vessel and all mating flanges are PN 16, Now Owner is asking to have a U-stamp vessel with PN 16 rating flanges.

Flanges material will be SA 105 and dimensions as per PN-16 rating (See attached pic for dimensions of PN 16 Flanges).

SA 105 is listed material so no worry about that, but how about the dimensional standard?
Can we accept PN 16 flanges and dimensions as per EN 1092-1 instead of B 16.5?
if yes then on what basis as per ASME VIII Div. 1?

Regards

 

[XL83NL]

Yes you can. The basis for doing so, ie dimensional verification, is as per appendix 2 of VIII-1, as mentioned before. Still, SA105 flanges to EN1092-1 sounds odd, but not impossible. By the way, IID also lists multiple EN materials.