A. Pressure sewers are designed to be safe in tension
B. The sewage when running full from inside, is called internal pressure
C. The internal pressure if any, causes tensile stress in the pipe material
D. All the above
A. Pressure sewers are designed to be safe in tension
B. The sewage when running full from inside, is called internal pressure
C. The internal pressure if any, causes tensile stress in the pipe material
D. All the above