Hydro testing a pipe with a welded flat plate connection
Hydro testing a pipe with a welded flat plate connection
(OP)
I'm trying to design a plate connection for a hydrotest of an 8" schedule 80 carbon steel pipe. This pipe will see flows with a pressure up to 900psi coming from a hydraulic cake pump. I do not ever expect the pipe to see pressures higher than 300psi though. However, for some reason, the owner wants me to test the pipe at 1500psi. Extreme I know.
My thought is to fillet weld a flat plate onto the pipe for the one time test.
I was planning to use a 9" x 9" x 1" plate and fillet weld the plate to the pipe.
I have been looking at various equations, but i've been out of school a bit, so i'm having some trouble finding exactly what I want.
How can I be sure that the weld will support the force from the hydrotest?
any suggestions.
thank you.
My thought is to fillet weld a flat plate onto the pipe for the one time test.
I was planning to use a 9" x 9" x 1" plate and fillet weld the plate to the pipe.
I have been looking at various equations, but i've been out of school a bit, so i'm having some trouble finding exactly what I want.
How can I be sure that the weld will support the force from the hydrotest?
any suggestions.
thank you.





RE: Hydro testing a pipe with a welded flat plate connection
RE: Hydro testing a pipe with a welded flat plate connection
So for time, and cost, I think i'm going to have to go with the plate steel.
RE: Hydro testing a pipe with a welded flat plate connection
RE: Hydro testing a pipe with a welded flat plate connection
RE: Hydro testing a pipe with a welded flat plate connection
RE: Hydro testing a pipe with a welded flat plate connection
RE: Hydro testing a pipe with a welded flat plate connection
But... a weld cap can't be that expensive. I haven't bought one in a while but maybe on the order of $100? And safe to use without having to hire an engineer to provide backup just in case something goes wrong. Keep in mind my commentary on the suitability of a 1" plate is worth every penny you paid for it if this should land in a courtroom!
jt
RE: Hydro testing a pipe with a welded flat plate connection
However, I have a lead on one from Tenn. So maybe i'll get that. If not I think the plate and weld will work for sure. I've run the calcs a few times over.
thanks for the advice. this was the first time I have ever posted on this, I definitely did not expect to get so much feed back so fast.
RE: Hydro testing a pipe with a welded flat plate connection
Is this yet another another piping system being designed using the "whatdoyathink" methodology ?
Test blinds, the required materials, thicknesses etc.. etc are all clearly defined in both ASME B31.1 and B31.3.
If the design pressure is 300 psig then the system test pressure should be 1.5X300 or 450 psig.
Its always a good idea to establish and refer to a set of rules.
With regard to the client's requirement of 1500 psig test pressure....... well... I have always strongly advocated drug testing of all clients in the initial stages of a project.
My opinion only
-MJC
RE: Hydro testing a pipe with a welded flat plate connection
Don't weld on a piece of plate for that kind of test pressure!
RE: Hydro testing a pipe with a welded flat plate connection
According to the owner the original lines were tested at 1700psi... which I do not believe at all.
so we got them down to accepting a test at 1500psi.
I am working on getting a cap though, so there is a chance it may be simple yet.
the drug test is hilarious by the way.
RE: Hydro testing a pipe with a welded flat plate connection
RE: Hydro testing a pipe with a welded flat plate connection
Found a bull cap i'm going to use today.
Going to put a weldlet on the cap. then weld the cap to a pipe extention. double groove the other side of the extension pipe, then attach it all to the vic fitting with the test line.
So i'll be able to hydrotest the pipe today after all.
thanks again gor the help.
this forum is great.
RE: Hydro testing a pipe with a welded flat plate connection
RE: Hydro testing a pipe with a welded flat plate connection
RE: Hydro testing a pipe with a welded flat plate connection
update? Did your test get run? Did everything survive?
Patricia Lougheed
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RE: Hydro testing a pipe with a welded flat plate connection
I didn't even have to duck for cover while it was testing either.