Air Test Procedure
The air test is carried cut by measuring the loss of air pressure in the pipeline over a period of 5 minutes.

The following procedure should be adopted:
Fix mechanical or ball stopper at the ends of the pipelines.
Connect a (U) tube gauge (manometer to a vented sealing stopper at one end of the pipeline as shown.
Apply air pressure by pump till the water level at 100mm of the (U) tube gauge.
The set-up is then left for 5-10 minutes to allow for temperature stabilization within the pipe, then the pressure is reduced (via the control valve) to exactly 100mm on the manometer scale. The manometer is then monitored for a period of 5 minutes; the level of water in the manometer should not fall below the 75mm mark during this period. This is deemed to “pass” and the pipeline is declared satisfactory.

However, if the level in the manometer does fall below the 75mm mark, then the equipment should be checked and cleaned and the pipeline examined for leaks or defects. If any problems are identified, they should be rectified before re-testing. If the air test is re-applied and is failed for a second time, a water test should be administered.

An air test is considered more sensitive than a water test. Failure of an air test may even be caused by temperature fluctuation within the pipeline. For example, in an uncovered pipeline (occasionally shaded by passing clouds on a sunny day) a drop in temperature of just 1º C within the pipe may be enough to cause a drop in pressure large enough for the test to fail. Failure to pass the air test shall not preclude satisfactory testing, if a water test can subsequently be carried out successfully. It is not impossible for a pipeline that has failed an air test to pass a water test.
2nd Industrial City, New Saniya,
New Al – Kharj Highway,
P.O. Box 17952,
Ar – Riyadh 11494,
Kingdom Of Saudi Arabia.
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