Chapter 1 – Wave Plan Method
Surge Analysis and the Wave Plan Method
Supplementary Material: Example Problems and Solutions
Chapter 1 – Problem 1.16
1.16. Resistance to flow across any open valve is defined as K = ΔH/Q2 where ΔH is (minor) loss across the valve and Q is flowrate, both in standard units. Compute K values for the following valves and associated flow conditions.
a. A fully open 200 mm butterfly valve with a minor loss coefficient of 0.5 [Answer: K = 25.82]
b. A partially open 200 mm butterfly valve with a minor loss coefficient of 5 [Answer: K = 258.2]
c. A fully open 200 mm globe valve with a minor loss coefficient of 5.
d. A partially open 200 mm gate valve with a minor loss coefficient of 2.
e. A fully open 200 mm ball valve of with a measured pressure drop of 0.1m at a flow rate of 0.1 m3/s.
f. A fully open 1000 mm swing check valve with a minor loss coefficient of 1.2.
g. A 300 mm globe type pressure relief valve with a minor loss coefficient of 5 which is discharging at its maximum capacity.
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