Example showing the application of the above table
Suppose the Weir to be 66 inches long, and the depth of water on it to be 11-5/8 inches. Follow down the left hand column of the figures in the table until you come to 11 inches. Then run across the table on a line with the 11 until under 5/8 on top line you will find 15.85. This multiplied by 66, the length of Weir, gives 1046.10, the number of cubic feet of water passing per minute.
FRICTION-LOSS IN POUNDS PRESSURE, FOR EACH 100 FEET OF LENGTH IN DIFFERENT SIZE CLEAN IRON PIPES DISCHARGING GIVEN QUANTITIES OF WATER PER MINUTE. ALSO VELOCITY OF FLOW IN PIPE, IN FEET PER SECOND.
----------+-----------------------------+----------------------------- Gallons | 1/2 Inch. | 3/4 Inch. discharged|--------------+--------------+--------------+-------------- per |Veloc. in Pipe| Friction Loss|Veloc. in Pipe| Friction Loss minute. | per second. | in pounds. | per second. | in pounds. ----------+--------------+--------------+--------------+-------------- 5 | 8.17 | 24.6 | 3.63 | 3.3 10 | 16.3 | 96.0 | 7.25 | 13.0 15 | .... | .... | 10.9 | 28.7 20 | .... | .... | 14.5 | 50.4 25 | .... | .... | 18.1 | 78.0 ----------+--------------+--------------+--------------+--------------
----------+-----------------------------+----------------------------- Gallons | 1 Inch. | 1-1/4 Inch. discharged|--------------+--------------+--------------+-------------- per |Veloc. in Pipe| Friction Loss|Veloc. in Pipe| Friction Loss minute. | per second. | in pounds. | per second. | in pounds. ----------+--------------+--------------+--------------+-------------- 5 | 2.04 | 0.84 | 1.31 | 0.31 10 | 4.08 | 3.16 | 2.61 | 1.05 15 | 6.13 | 6.98 | 3.92 | 2.38 20 | 8.17 | 12.3 | 5.22 | 4.07 25 | 10.2 | 19.0 | 6.53 | 6.40 30 | 12.3 | 27.5 | 7.84 | 9.15 35 | 14.3 | 37.0 | 9.14 | 12.04 40 | 16.3 | 48.0 | 10.4 | 16.1 45 | ... | ... | 11.7 | 20.2 50 | ... | ... | 13.1 | 24.9 75 | ... | ... | 19.6 | 56.1 ----------+--------------+--------------+--------------+--------------
----------+-----------------------------+----------------------------- Gallons | 1-1/2 Inch. | 2 Inch. discharged|--------------+--------------+--------------+-------------- per |Veloc. in Pipe| Friction Loss|Veloc. in Pipe| Friction Loss minute. | per second. | in pounds. | per second. | in pounds. ----------+--------------+--------------+--------------+-------------- 5 | 0.91 | 0.12 | ... | ... 10 | 1.82 | 0.47 | 1.02 | 0.12 15 | 2.73 | 0.97 | ... | ... 20 | 3.63 | 1.66 | 2.04 | 0.42 25 | 4.54 | 2.62 | ... | ... 30 | 5.45 | 3.75 | 3.06 | 0.91 35 | 6.36 | 5.05 | ... | ... 40 | 7.26 | 6.52 | 4.09 | 1.60 45 | 8.17 | 8.15 | ... | ... 50 | 9.08 | 10.0 | 5.11 | 2.44 75 | 13.6 | 22.4 | 7.66 | 5.32 100 | 18.2 | 39.0 | 10.2 | 9.46 125 | ... | ... | 12.8 | 14.9 150 | ... | ... | 15.3 | 21.2 175 | ... | ... | 17.1 | 28.1 200 | ... | ... | 20.4 | 37.5 ----------+--------------+--------------+--------------+--------------