Waste Water Engineering
In case of sewer lines

Obstruction test is carried out with the help of smooth ball of diameter 13 mm
Water test is carried out to check water tightness of the joints
All listed here
Test for straightness is carried out with the help of a lamp and mirror

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Waste Water Engineering
The pressure exerted by

The internal pressure if any, causes tensile stress in the pipe material
The sewage when running full from inside, is called internal pressure
All listed here
Pressure sewers are designed to be safe in tension

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