CCTV Drain & Commercial Drain Survey Mangravet

How to Test Drain

A drain pipe test ensures the pipe is sufficiently watertight. This prevents the pipe from leaking its contents into the surrounding soil and potentially overloading or contaminating the local water table. When laying new pipes, it is essential to test them before the trenches in which they are laid are back-filled with soil, as this saves you a lot of time and effort in digging them back up again should they fail.


- Clean the end of the pipe that will be tested to remove any dirt or other debris that could affect getting an air tight seal. Place the bung stopper in the end of the pipe. Turn the wing nut on the stopper until it cannot turn any more, to expand the stopper and create an air tight seal. Seal off any branches on the pipe with more bungs.


- Connect the hand pump to the hose via the T-piece connector. Connect one end of the hose to the manometer. Fix the hose nipple in place on the stopper in the pipe, to allow the hose to be attached. Connect the free end of the hose to the hose nipple.


- Squeeze the hand pump to increase the air pressure in the pipe until the level on the manometer reads between 5 and 6 inches. Close the control valve on the hand pump. Let the pipe stand for 10 minutes to level off temperature and pressure in the system.


- Open the control valve and allow the pressure to drop so the manometer reads 3.93 inches. Close the control valve again and leave the pipe for five minutes. If after this time the pressure in the pipe has not dropped below 2.95 inches, the pipe is sealed correctly. If the pipe fails this air test, run a water pressure test to check its seals again.


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