SUBJECT: How pipe friction, liquid capacity and pump head are affected by the amount of liquid flowing through a pipe. 11-8
You can use the following formulas to supplement the Affinity Laws
Please use these keys when you read the following ratios:
hf1 The friction loss in the piping, valves and fittings before the change in flow.
hf2 The friction loss in the piping, valves and fittings after the change in flow.
Q1 The pump capacity before the change in flow.
Q2 The pump capacity after the change in flow.
H1 The pump head before the change.
H2 The pump head before the change.
D1 The impeller diameter before the change.
D2 The impeller diameter after the change.
If you are not familiar with raising a number to some power, please look at the following examples :
35 means 3 x 3 x 3 x 3 x 3 = 243
32.5 is the same as 3 5/2 means 3 x 3 x 3 x 3 x 3 = 243, then take the square root of 243 = 15.6. Another way is to do it is to multiply the square of 3 (9) by the square root of 3 (1.732) = 15.6. The second way is easier.
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