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I want to build a very cheap hydros

I want to build a very cheap hydros

I want to build a very cheap hydros

(OP)
I want to build a very cheap hydrostatic pressure testing aparatus for testing a simple 5" IPS vessel that is about 48" long with npt connection on top and bottom for inlet and outlet ports.

I am thinking that I can do this by using a 6" OD x .5" wall tubing by about 6" high, pipe with a 1/4" NPT fitting near the bottom for this "cylinder".  I would also weld a plug in the bottom (ID of the tubing) to hold water and allow me to pressurize this "cylinder".  I would run braided SS hose with 1/4" npt fittings to connect the "cylinder" to the vessel.

This I plan to preform in a "standard" 20 ton shop press that most any machine shop or factory would have a few of.

I plan to fill the above described "cylinder" with 3" of water (I don't want to deal with any type of oil) so as to leave enough room for a "piston" to pressurize the vessel by using the bottle jack to press down on the top of the "piston" at the top of the 20 tom shop press.

The piston would have 2 orings on it per standard oring spec's for hydraulic fittings (i.e. out of the Hercules Oring catalog) and I hope to read the resulting pressure on a gauge on the vessel.  This is assuming the vessel I am testing is full of water before and below the piston and cylinder on the shop press.

Shouldn't this work if I use a bottle jack to "rachet" the piston down through the cylinder bore in a slow fashion?
I would like to get up to ~ 1,000 psi and hold it there for 5 minutes or so to test the welds on the vessel.

Thank you,

Steve

RE: I want to build a very cheap hydros

scarg,

I guess that you could do this.... but why ? A company called McMaster-Carr offers this type of hydraulic test pump for sale very inexpensively. Two types are available, electric and "hand" powered. (see page 1345 in the 1999 catalog)

The type of pump you are talking about..... for tank testing, would cost about $225, brand new....... and would come with a calibrated gauge and hose. You could even probably find a used one somewhere...... that is if you are really, really really cheap....

Are you the type of person who buys a car and then decides to redesign the jack that he finds in the trunk ?? I don't understand.... Also, why are so many words in "quotes"....????

MJC

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