Chapter 5 – Surge Protection
Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Chapter 5 – Problem 5.5
5.5 A thorough surge analysis study has indicated that high surge pressures on a transmission main can be brought within the allowable limits by using a pressure relief valve (PRV) with an outflow resistance of 20. The highest flowrate through the PRV during the unsteady flow conditions was 2.5 m3/s. The PRV was modeled as discharging water to atmosphere.
a. If a globe-type valve is proposed as the PRV, what should the minimum valve diameter assuming a minor loss coefficient of 3.5 for fully open generic globe valve?
b. What is the highest flow velocity through the globe valve?
c. How does this velocity compare with the maximum pipe velocities normally allowed in drinking water supply systems?
d. What is the approximate driving head across the PRV during peak discharge?
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