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To perform a hydrostatic test on Plumbing/pipe you must pressurize the the pipe to the pressure that your local authority having jurisdiction has established. The system will be pressurized with water to various psi's depending on what king of pipe was used. I work in the fire sprinkler industry, and when we hydrostatic test a fire sprinkler system we "charge" it to 180 psi and then it must maintain that pressure for a period of 2 hours losing no less than 3 psi. The pump we use is comprised of an electric motor that is connected to compressor type valve body like the ones you see on a pressure washer. We connect a water hose to the intake side of the valve body and then pump water into the system through an orifice that is downstream from the main check valve. We leave an axillary drain open that is located at the farthest point from the water main that is supplying the system. We allow water run through the system until any and all air has been purged from the lines. Then we close the drain and as I stated earlier we pump it up to 180 psi. Obviously you will not pressurize pvc,cpv, or most other types of pipe that way. If I were you I would see if I could find a code book that was written for the jurisdiction you are in and go from there.
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