flanges fixed with screw clamps

[Jéferson Gustavo]

Dear all, good afternoon!

Does anyone know of a method for calculating flanges fixed with screw clamps?

Any suggestions are welcome.

Thank you in advance.

 

[r6155]

See ASM VIII Div. 1 Appendix 24.

Regards

 

[Jéferson Gustavo]

Hello, r6155!

Thank you for your reply. The type of clamp I am referring to is the same as the one in the image below, different from the clamp mentioned in Appendix 24.

 

[r6155]

You must follow appendix 24 properly.

 

[Trestala]

Another incorrect and misleading response by @r6155.

@Jéferson Gustavo, I suggest rather than design the clamp yourself, try to reach out to the fabricator/suppliers of such clamps and get a calculation, rating, or proof testing records from them.

 

[Jéferson Gustavo]

Thank you all for your answers.

Trestala, the clamps will be manufactured by us. We will use FEA for verification.

Best regards

 

[Trestala]

@r6155 I am not sure why you are still engaging in this forum if most of your responses have not been relevant to the discussion and not helpful. The sketch is shown which is clearly out of scope of Appendix 24.

 

[r6155]

@Trestala
You are those engineers (engineers?) who look for a sketch in the CODE and if you don't find it, you have nothing to do. You have to read the text.

 

[IdanPV]

I think that EN 13445-5, C.5 will be a good place to start.
However, it does not provide specific design guidance.
Under ASME VIII-1, this kind of closure will fall under U-2(g).

 

[Trestala]

Agree with @IdanPV that this falls under U-2(g).

I also suggest looking into ASME VIII-1, Nonmandatory Appendix S and ASME PCC-1 as well regarding considerations when you design such part. You'll need to establish tightening requirements considering relaxation, safety factor, and various load cases. Or consider proof testing as well.

But not sure what really is the advantage of that clamp compared to Appendix 24 clamps or Grayloc.

 

[Jéferson Gustavo]

Thank you very much for all the answers.

 

[Cobra17]

A little late, but I've done lots of vessels with this type of bolting, typically called J-bolts. If you have a pull test on the J-bolt then you can do an appendix 2 calculation and the bolt circle is where the J-bolt makes contact with the flange lip. The pull force can then be converted to a psi to be used for the bolts.

Most commercial software doesn't allow you to do this so you will need spreadsheets or hand calcs.

These are used all the time for glass lined vessels.