Waste Water Engineering
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of

Methane gas
Hydrogen sulphide gas
Petrol vapours
Carbondioxide gas

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Waste Water Engineering
The pressure exerted by

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

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