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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Waste Water Engineering
Stone ware pipes are

Hydraulically efficient because of their smooth interior surface
Especially suited to pressure pipes
Highly resistant to sulphide corrosion
Highly impervious

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