. Bulletin. Agriculture; Agriculture -- Arizona. Tests 137 TABLE XIX. FRICTION TESTS ON CEMENT PIPE LINES AT CONTINENTAL' From To Dist. ^jg_ I Loss Diam. charKel °^ Time Value after ad-j of April 26, 1917 Lateral No. 2 Lateral No. 3 R. R. Crossing Ft. Uteral No. 3 897 [ 2063 R. R. Crossing I illOO Riser No. 4 ' 1120 In. 14 14 12 16 I Ft. I . Sept. 27, 1917 Lateral No. 2 Lateral No. 3 R. R. Crossing Lateral No. 3 897 14 [ 2063 14 R. R. Crossing i I illOO 12 Riser No. 4 ^ ^^^° ^^ Oct. 8, 1917 Lateral No. 2 Lateral No. 3 Lateral No. 3' 897 f 2063 R. R. Cros
. Bulletin. Agriculture; Agriculture -- Arizona. Tests 137 TABLE XIX. FRICTION TESTS ON CEMENT PIPE LINES AT CONTINENTAL' From To Dist. ^jg_ I Loss Diam. charKel °^ Time Value after ad-j of April 26, 1917 Lateral No. 2 Lateral No. 3 R. R. Crossing Ft. Uteral No. 3 897 [ 2063 R. R. Crossing I illOO Riser No. 4 ' 1120 In. 14 14 12 16 I Ft. I . Sept. 27, 1917 Lateral No. 2 Lateral No. 3 R. R. Crossing Lateral No. 3 897 14 [ 2063 14 R. R. Crossing i I illOO 12 Riser No. 4 ^ ^^^° ^^ Oct. 8, 1917 Lateral No. 2 Lateral No. 3 Lateral No. 3' 897 f 2063 R. R. Crossing' 1100 R. R. Crossing ' Riser No. 4^ Oct. 8, 1917 Lateral No. 2 1120 14 14 12 16. Lateral No. 3 R. R. Crossing Lateral No. 3* 897 14 [2063 14 R. R. Crossing* 1 \ [noo 12 Riser No. 4' . 1120 16 1 02 0133 1 24 0130 1 02 i .0130 3 20 0130 3 20 I 0117 3 20 ' .0135 1—3:00 P. M. 2—2:35 P. M. 3— P. M. 4—5:20 P. M. Tests were made on three different dates. Considerable diffi- culty was experienced in getting consistent results in these tests. For example, in the first set of tests the friction losses between Lateral No. 2 and the railroad crossing appeared to be inexplicably large. In the tests as repeated on September 27, the loss between Lateral No. 2 and Lateral No. 3 is too great. It was thought at first that the reason might be that considerable portions of the pipe were not running full, even though all pipe ends in the gate pits were well covered. This hypothesis was disproved when it was found that the friction losses were less in the second set of tests, although the water levels in the gate pits were lower than in the first set. A better explanation is that in the long line running north from the pump to the railroad on a descending grade, a great deal of air is trapped. This air cannot work back upstream against the water friction, and so it is slowly rolled along down- stream until it escapes at the gate pits. A
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