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<br /><'::> <br /> <br />....."""'\ <br />, . <br /> <br />i.<j <br />u <br />~:' <br />,.:J <br /> <br />Q is the flow at each tree <br />e <br />From the pressure (Pi + 1) the length of microtube can be <br />calculated from the following equation: <br />LOG TL = 22.3+ (1.06 LOG P) + (26.27 log d) + (7.66 (log d)2) - <br />(1.38 log F) ~ (.15 x log F)2. <br /> <br />TL is total length in inches of the microtube. <br />P is the pressure in the line in P.S.i. <br /> <br />D is the diameter of the line in inches. <br /> <br />F is the flow of- the microtube in gallons per minute, <br /> <br />'. <br /> <br />The program for the,~.P, 25 is: <br />Rec. 3; STO + 1; ,0667 STO - 2; Rec. 2; 1.8~; yx; Rec 4 x; STO - 1 <br /> <br />REC 1 R/S (The pressure is displayed) <br /> <br />x <br />FLOG; 1.06 x; REC 5+; g 10 <br /> <br />STO 3 is ,433 x Lt x SL change in pressure due to head. <br />STO' 1 is p. initial pressure. <br />~ <br />STO 2 is q initial flow number of trees x emitters (GPM) . <br />STO 4 .constants for lateral size diameter from EQN (2) <br /> <br />for 1" = .09481 <br /> J <br />for 3/4" = .030918 <br />for 5/8" = .059888 <br />for 1/2" = .144764 <br />for 3/8" = 1. 73018 <br /> <br />STO 5 constants for flow of microtube from EQN (3) <br /> <br />.04 microtube = .54557 <br /> <br />.036 microtube = .33952 <br /> <br />The same equation can be used for the flow in pipes and <br /> <br />sprinkler emitters are used. <br /> <br />-7- <br />