Civil Engineering - Waste Water Engineering - Discussion

The laid pipes are usually tested to ascertain the water-tightness of the pipes and joints. There are three tests that are commonly performed to test leakage of the pipes and are as follows:.

(i) Air Test - Generally used to test underground and vertical pipes. The escape of air from the leaky joint form bubbles that can be seen visually.

(ii) Water Test - Most commonly used for underground house sewer pipes. The drain is plugged at the lower end and the water is filled in the pipe through the upper manhole to maintain a pressure of 1 to 1.5 m depth of water. If there is no drop in water level in 10 minutes, then there is no leakage from the pipe.

(iii) Smoke Test - Generally used to detect leakage of existing vertical sullage pipes or rainwater pipes. In this test, smoke is forced into the pipe with the help of a blower to test the leakage.

No, the answer is correct as for pipe network in a building we need to check only the leakage. So only smoke test is conducted.

The Correct answer should be D.

Here they have asked for a building so, the smoke test is used.

Answer is correct because other two options are used for large work.

In the drainage methane gas then check the content of the methane gas that's why this test is conducted.

Why option D is correct?

Describe please.

Option D is correct.

Yes, it's D.

D should be the correct option.