Tri-clamp unit

[LukaV]

Hi all,

Does anyone of you have Tri-clamp unit calculation?

We are designing pressure vessel with Tri clamp DN300 - 12˝ cover on the top.
We are woriking with AD2000 (Europe) and i can't find anything simillar. I also checked inside ASME standard, but all i found was clamping union but the geometry of the flange is different and the connection flange to flange is metal to metal.
When i asked clamp manufactures selling clamps with specified pressure, lets say the are selling clamp High Pressure Tri-Clamp (13MHP) than the pressure is up to 150 PSI @70°F / 100 @250°F, they all reply with asnwer: Yes this clamp is designed to work under that pressure but we can not provide any certifacates for union parts (ferrule, blind, clamp).

All help welcome. Thank you in advance.

Luka

 

[LittleInch]

What sort of calculation are you after?

Looking at what you have ( any links you can share), look like vendor certified equipment tbh.

Vector techlok are the only type I see for high pressure stuff.

You're at the top end for size and pressure for these types of clamps.

Personally I think they are too easy to over tighten and repeated use or pressure cycles of the lid risks fatigue at the inner face of the clamp which no one ever looks at and they you can easily get catastrophic failure of the lid.

A rather extreme example maybe, but this https://www.eng-tips.com/threads/la...-seventeen-people-injured.484866/page-4#posts used a similar mechanism - look at page 3 for the design - and I personally thought it was a poor non fail safe design which relied 100% on the clamping force from the clamps. If that clamp itself failed then there is no back up - the items fails and the lid flies off like a berserk disk and all the contents come flying out.

Ther eis also very little to tell you its failing. If it doesn't seal all anyone does is tighten it up further...

Are you really sure you want to clamp in 150psi of pressure on a 12" lid using this type of clamp???

Has it been risk assessed / tested to failure? how will it be inspected?
Why can't you use something much more robust?