Waste Water Engineering
The asbestos cement sewers are

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

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Waste Water Engineering
The pressure exerted by

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

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