A cast iron pipe of 300 mm diameter and 8 mm thick is 1500 m long. The pipe is to convey 200 litre/s of water. (i) Estimate the maximum time of closure of a valve at the downstream end that would be...

A cast iron pipe of 300 mm diameter and 8 mm thick is 1500 m long. The pipe is to convey 200 litre/s of water.

(i) Estimate the maximum time of closure of a valve at the downstream end that would be recognised as a rapid closure.

(ii) What is the peak water hammer pressure produced by rapid closure?

 (iii) What is the length of the pipe subjected to peak water hammer pressure if the time of closure is 2.0s?

[For water E = 2200 MPa; for cast iron E = 80 ×10⁹
Pa]