Use of DIN 933 bolts under the scope of ASME B31.3 &/or ASME VIII div 1

[Rspain]

Dear All,

Help please.

Trying to use DIN 933 ASTM A193 B7 grade bolts for ASME B16.5 #300 WN-RF A105 flanges, under the scope of ASME B31.3 (joining pieces of pipes and valves) and ASME VIII div 1 (connecting flanges, valves etc. to vessels designed under ASME VIII div 1), for an installation in the US.

Don't know if this is possible, acceptable, etc. and if any calculus or justification is required to do so.

Thanks and best regards,
RTo

 

[GD2]

Rspain,

Material wise there is no issue. A193 B7 is acceptable to both B31.3 and BPV Sec VIII Div 1.

Bolt dimension wise there is an issue. Acceptable bolting standards to B31.3 and Sec VIII Div 1 are B1.1, B18.2.1 and B18.2.2. It is also acceptable to use in B16.5 flanges.

While DIN 993 is equivalent to B18.2.1, there will be some dimensional and tolerance difference between the two as DIN 993 is a Metric and B18.2.1 and B18.2.2 are Inch Series. It will be in your best interest to check the dimensional difference between the two. At the end, it is the load per bolt that is most important.

Check with your local code the acceptable bolting standard and also the vessel connecting flange design. If it's a 'Off the Shelve' B16.5 flange, you don't have to do the bolt analysis but if the vessel tie-in flange is a custom one, a further analysis will be required to pass the bolting even if it is ASME bolting.


Ganga D. Deka, P. Eng
Canada

 

[XL83NL]

B16.5 table 1C is not a requirement but a recommendation. That may provide some slack to using DIN 933

 

[Rspain]

Thank you GD2 & XL83NL.

One doubt (GD2). Not sure what you mean with:

"If it's a 'Off the Shelve' B16.5 flange, you don't have to do the bolt analysis but if the vessel tie-in flange is a custom one, a further analysis will be required to pass the bolting even if it is ASME bolting."

In both cases (the flanges in the piping and the flanges in the vessel), flanges are standard commercial ASME B16.5 #300 WN-RF A105 flange. Does that imply something or does it help?

Thanks for your kind help,
With best regards,
Rto

 

[GD2]

Rspain,
Just make sure of the vessel flange. Many times it can be a custom flange design, in which case bolting analysis is required.

Ganga D. Deka, P. Eng
Canada