How is Hydrostatic Test Achieved?
A basic question from a non-ITM guy: is the hydrostatic 200 psi or 50 psi over working pressure test simply achieved by hooking up a mobile pump to the system and gauging for pressure loss and visual leakage?
I have not witnessed one of these myself, and wondered if a system design usually would incorporate an extra small outlet for this test or if it's just connected to a main end-cap or something similar.
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Yes, hydrostatic test pressure is achieved using a high pressure mobile test pump. Normally an extra outlet is not provided; usually they'll just remove a sprinkler and screw in a 1/2" pipe nipple with a 1/2" ball valve, which can then be easily connected to the test pump. After test pressure is achieved, the ball valve is closed, and the test pump connection is removed. Test pressure is normally read at the pressure gauge above the riser, or downstream of a zone control valve, but it can be read at any system "low point". I usually ask the contractor to switch out the standard riser trim pressure gauge with a calibrated liquid filled gauge, or I just bring my own calibrated gauge as many contractors won't have a calibrated gauge on hand. Record the pressure at the start of the test, and walk the system during the test looking for drops of water on the floor.....looking up at the pipe can be helpful, but I've found it much easier to spot leaks by looking for drops on the floor as opposed to seeing a drop on a pipe fitting. No leaks and no pressure drop = successful test. Be aware that pressure can fluctuate due to temperature changes too.
4/17/2019 12:42:39 pm
When it comes to an outlet, we will use a tapped cap with a pipe down at the riser location if the riser is not built or any aux drain location. If the riser is built, we will use a port on the riser check or the Test-n-Drain has the 1/2" outlet for the PRV that isn't installed for the hydro static testing portion.
4/17/2019 03:08:38 pm
Technically every portion of the system subject to FDC pressure so it should go through the FDC if it is riser mounted.
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