A Guide To Water Well Casing and Screen Selection   -   36

9.5  TABLE A

Head Losses Through Pipe

Lay a straightedge on scales at the points for any two known quantities, and the unknown quantities will lie at intersection of the straight edge with the other scales.

Example: To discharge 500 gallons per minute through 6-inch pipe, following dotted line would show loss of head in a thousand feet of approximately 25 feet and velocity of 5.7 feet per second.

Note: Loss of head in cast iron pipe = loss of head in steel pipe multiplied by 1.5. Loss of head in concrete pip = loss of head in steel pipe multiplied by 2. When pipe is somewhat rough add 10 percent to loss of head; when very rough add 25 percent.

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