Relaxation Rewind! Bad Drains and How to Test Them, Part 1
Boring Books for Bedtime Readings to Help You Sleep
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Testing Drains by Compression of Gas
The method of testing drains and fittings by compression of gas is as follows. This instrument or a gas pressure gauge when attached to the drain will denote by the rising of the liquid the amount of compression in the drain. It is cheaper and more convenient than the pressure gauge and registers any pressure during the testing of drains. Also, the amount of water thrown into a trap to produce the necessary pressure of gas to lift the liquid 1 inch in the detector or pressure gauge. The quantity being as near as possible, 3 and 1 third ounces of water to 1 cubic foot of gas space.
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