Waste Water Engineering
The asbestos cement sewers are

Not structurally strong to bear large compressive stress
Susceptible to corrosion by sulphuric acid
Light in weight
All of these

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Waste Water Engineering
The pressure exerted by

Pressure sewers are designed to be safe in tension
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

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Waste Water Engineering
Skimming tanks are

Tanks provided with self- cleansing screens
Used to remove the grease and oil
Improved version of grit chambers
Those from which sludge is skimmed out

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