Tri-Clamp fittings in an ASME vessel

[tbeek]

I have a similar issue as the following thread:
thread794-460032

How do I prove that "Tri-Clamp" ferrules meet ASME BPVC Section VIII Div1?
The first vessel will be used in USA, but we have a request for a future vessel to be used in Canada.

The ferrule neck meets code when calculated as a nozzle, but how do I justify the design of the sealing surface of the ferrule?
We are not supplying the clamps.

 

[EdStainless]

These are listed in ASME BPE, but I don't know if the there is a real spec for them.
You will have spec one brand for fittings, gaskets, and clamps. They are not all made the same.

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P.E. Metallurgy, consulting work welcomed

 

[cbPVme]

ASME BPE is not an adopted standard under ASME VIII-1. These ferrules are not covered by any code rules, therefore they either need to be burst test per UG-101 or you could analyze with FEA following Appendix 46.

 

[SnTMan]

tbeek, have you asked the manufacturer(s) whether or not they certify their fittings to Sec VIII, Div 1? See UG-11

Regards.

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[Cobra17]

I know that some companies have CRN's for ferrule connections. Try Holloway America, they have an CRN for Ontario.

 

[EdStainless]

There are some mfg that have gone to the 'trouble' of doing the analysis and testing needed. They will charge you for that but it is easier than trying to do it yourself.

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P.E. Metallurgy, consulting work welcomed

 

[tbeek]

I have found a few companies that have CRN for their ferrules and other parts (Steel & O'Brien has a comprehensive selection).
I presume these are fitting CRN's for piping systems. Can I weld a CRN fitting into a presure vessel as a nozzle and simply say it meets ASME because at some point in the past a Canada jurisdiction approved it and gave it a CRN? Seems unlikely.

And I have found several companies that list a pressure-temperature rating of the ferrule-gasket-clamp system, but after contacting them, no one (so far) can give me any background on how those ratings were determined. So I think that fails UG-11(d)(11)(-c).
Also it would be a rating of the clamp system, not the ferrule alone. My vessel stops at the face of the ferrule; the gasket, clamp, and other ferrule is not in my scope. The clamp (or the gasket) seem to be the weakest link.

It seems like a burst test may be the only option, but again the result will depend on the clamp and gasket too.

 

[Cobra17]

Because it has a CRN, and it's considered a fitting, you can just weld it on to the vessel as long as you do area replacement, internal pressure calcs and UG-45 calcs.

The CRN for the ferrule covers the ferrules and clamp. Because they are BPE (assuming) the ferrules will be dimensionally the same (within tolerances) so you don't need to worry about the piping side buying a different manufactures fitting. The Canadian Jurisdiction will want the Ferrule and Clamp CRN of the ferrule you are using, doesn't mean you have to use the clamp, just that it works with a clamp of BPE dimensions... which needs to be better defined within BPE itself.

BPE does have pressure/temp listings in it, but they are not based on testing so the Jurisdictions don't like to accept them.