Flange with EN1092-1 Dimension and ASTM Material in ASME VIII BPVC 4

[patchlam]

Dear all engineers,

I am designing a pressure vessel (header) by using ASME VIII Div 1. The challenge here is the end user wants us to use the flanges with the dimension specified in EN1092-1 but we can maintain the ASTM material (such as A105). May I know is it allowed to use such kind of flange in our ASME-designed pressure vessel?

Thanks!

 

[TGS4]

You will have to qualify the design pressure at the design temperature using Appendix 2. Some standard flanges may fail that calculation (some ASME B16.5 flanges do). if you are not using the flanges to their fully-rated pressure, then you are likely fine.

 

[patchlam]

Hi TGS4,

Thanks for your reply. So my understanding is, as long my flange (SA 105 with EN 1092-1 dimension) can pass the calculation in Appendix 2, ASME VIII Div 1, it is qualified from ASME VIII perspective?

 

[TGS4]

Yup

 

[TomBarsh]

ASME VIII Division 1 lists the accepted Standards from which produced parts can be accepted as "standard" pressure parts and assigned a pressure-temperature rating. Typically these include only ASME Standards. Pressure parts produced to other standards (such as the EN, DIN, etc Standards) have to be analyzed per ASME rules to obtain a pressure rating. This even holds true for other Standards based in the USA, such as for API, AWWA, etc, including "standard" flanges per these documents.

 

[europipe]

You have to look in the tables of EN1092 for the max. allowable temp./press. of the PN flange.
Look in table 5a/5b for the group, compare with table 15 to 20 , maybe table F.1 too.