Question 3.1: Diameter of a water supply pipe is 700 mm. It has to stand a...

Water head that the water supply pipe can withstand is 60 m. The pressure is given by

p = γh

where γ is the specific weight of water = 9810 N/m³. Therefore,

p = 9810 × 60 = 0.588 MPa

Now for the pipe, circumferential stress is

\sigma_1=\frac{p r}{t}

This is the maximum stress or significant stress, and hence we can find out the thickness of the pipe from this expression:

\sigma_1=\sigma_{\text {permissible }}=\frac{p r}{t}

or        20=\frac{0.588 \times(700 / 2)}{t}

Therefore, thickness is found to be 10.30 mm.