Bolting for Hydrotest
Bolting for Hydrotest
(OP)
Hi,
I understand that the design stress for bolting during a hydrotest can be multiplied by 1.5
Does this mean that I can use bolts that have 2/3 the root area of the service bolting for a one off hydrotest?
Would there be any problems or risks with this ?
I understand that the design stress for bolting during a hydrotest can be multiplied by 1.5
Does this mean that I can use bolts that have 2/3 the root area of the service bolting for a one off hydrotest?
Would there be any problems or risks with this ?





RE: Bolting for Hydrotest
RE: Bolting for Hydrotest
The cost is considerable for something that will not be used again.
RE: Bolting for Hydrotest
In the event that there was leakage, someone else in your team or an independent will never concur with the smaller size bolts. They will always go with the minimum specified by the code of design. Then you will have a lot of explaining to do.
But if you do your sums and the numbers work out and you feel confident, then for sure go with the most economical alternative.
RE: Bolting for Hydrotest
If this vessel cannot have ALL the air vented out, don't hydro anywhere near people. Flange may just leak, but there have been catastrophic failures due to undersize bolting.
Hope for the best, plan for 'What If' the flange goes ballistic.
RE: Bolting for Hydrotest
What steps to take next ? .... Big ones.
RE: Bolting for Hydrotest
We have decied to downsize to 2 3/4" bolts, it saves some money (which keeps the Project happy) and stops us worrying too much.
Cheers