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close this book A training manual in conducting a workshop in the design, construction, operation, maintenance and repair of hydrams
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Attachment 5-B

Answers to Review Exercise #1

Session 5, Handout 5B

1. The hydram is located below the source of water and is used to pump the water to a storage tank which is higher than the source. The water accelerates as it flows down hill through the drive pipe and out the impulse valve until it reaches such a velocity as to slam the impulse valve shut. This causes a water hammer effect, forcing water and a few air bubbles sucked in through the snifter from the previous cycle, through the check valve and into the accumulator filled with air. This movement of water into the accumulator causes the air to compress until the forward momentum is stopped. At this point the water in the accumulator bounces back because of the spring effect of the air in the accumulator. This rebound in the opposite direction causes the check valve to suddenly close, causing negative pressure in the hydram before the check valve. Because of this negative pressure, air is sucked in through the snifter and the impulse valve is caused to open again at which point water starts exiting through the impulse valve and the cycle starts again.

2.

H - 20

h = 100 + 20 = 120

Q = 10

n = .50

q = Q x H/h x n

q = 10 x 20/120 x .50 = 0.8333 gpm

0.8333 gpm x 1440 min / day = 1200 gpd



3. 5 3/8" on the weir table is 37.25 gpm.

This times four equals 149 gpm.

4. Any answer within reason is OK.

5. Any answer within reason is OK.