Question

_______ causes hoop tension in pipe shell.

(a) Internal water pressure

(b) External water pressure

(c) Water hammer

(d) Longitudinal stress

This question was posed to me during an interview for a job.

My enquiry is from Layout of Distribution System in chapter Conveyance and Distribution of Water of Environmental Engineering

Answer 1

Correct choice is (a) Internal water pressure

To explain: Internal water pressure causes hoop tension in pipe shell and its magnitude is given by f = pd/2t where p is the internal pressure of water, d is the diameter of the pipe and t is the thickness of pipe shell.