Over Pressure Allowance on Hydrotests???
Over Pressure Allowance on Hydrotests???
(OP)
My construction testing crew inadvertantly let a test creep up over my stated test pressure due to an increase in temp on the line during the test and didn't bleed it down as they were supposed to. When my QC found the gauge it was @ 3500 kPa. Test limit supplied by Client was to be 2950 kPa. Piping materials are for a 150# flange rating with A333-6 pipe and A350-LF2 fittings (flanges). How do I assure the client that every part contained within the test will be okay? Client would like a detailed explanation and I am having trouble finding something within the B31.3 and B16.5 codes. What would you suggest I do in this situation? Any help would be appreciated?
Previous history at this site has had one other test go awry with the overpressure of a stainless line being effectively doubled and it was let go because of some engineers approval. I am not an engineer so I am not sure.
I hope this is enough info.
Previous history at this site has had one other test go awry with the overpressure of a stainless line being effectively doubled and it was let go because of some engineers approval. I am not an engineer so I am not sure.
I hope this is enough info.





RE: Over Pressure Allowance on Hydrotests???
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
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RE: Over Pressure Allowance on Hydrotests???
Did you test through any valves? Pretty tough to calculate a hoop stress in a cast or forged valve body. In that case, to do this rigorously you would have to run a FEM model of the valve body to see how close to Smys you got. This is Not a trivial task.
RE: Over Pressure Allowance on Hydrotests???
Any suggestions??
RE: Over Pressure Allowance on Hydrotests???