Hydrotest
Hydrotest
(OP)
Dear All
We are in the process of hydrotesting piping system. Piping is already installed with pump in it.
Do we absolutely need to isolate the pump ?
Can you not leave the pump inside the piping loop ? Under what conditions, this can be done ?
what are the pros and cons of each ?
Thanks
We are in the process of hydrotesting piping system. Piping is already installed with pump in it.
Do we absolutely need to isolate the pump ?
Can you not leave the pump inside the piping loop ? Under what conditions, this can be done ?
what are the pros and cons of each ?
Thanks





RE: Hydrotest
RE: Hydrotest
If you have gland packing then you may blow the packing gland or you cannot obtain static pressure because it will be the weakest link. If you take the pump out flush the pipe work then put the pump in line if you want to include in the system
trust this helps
RE: Hydrotest
"The top of the organisation doesn't listen sufficiently to what the bottom is saying." Tony Hayward X-CEO BP
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: Hydrotest
David
RE: Hydrotest
Also, because of the wording of the question, I'm picturing a pump in a closed loop. However, if the pump is not part of a closed loop, then there's always the chance that equipment and piping somewhere upstream of the pump might be vulnerable to the test pressures required to test the discharge side of the pump.
I just prefer to blank pipe sections off between equipment attachment points and test those. After all, I'm just interested in the pipe, not the equipment at either end, which should have already gone through its testing at the shop if it's pressure retaining equipment.
RE: Hydrotest
RE: Hydrotest
"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: Hydrotest
I'm not a seal expert but I believe seals are actually intended to "leak". We provide a flush (such as a API Plan 11) to reverse that leakage back into the stuffing box or we allow it to "leak" back to the suction side of the pump (such as a API Plan 13). Without fluid circulation and flush the faces will open up and you will most likely damage the spring(s).
It won't take long to install some "pancake" blinds in the pump flanges. Just be sure you don't move the pump when you install the blind plates. Verify alignment prior to startup. If you have spectacle blinds (which is the preferred way to install spools going to a pump) be sure you swing them to keep the stress off the pump.