2003-P06324 - new septic - Laserfiche WebLink

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PUMP SELECTION PROCEDURE perforation Discharges in gpm A. Determine pump capacity: perforation diameter gravity distribution head inches) :1.Minimum required discharge is 10 gpm (feet) 1/8* 3/16 7/32 1 114 2. Maximum suggested discharge is 45 gpm 1.00 0.18 0.42 0.56 0.74 pressure distribution 2.0b 0.26 0.59 0.80 1.04 see pressure design worksheeet 5.0 0.41 0.94 1.26 1.65 Selected pump capacity: /q 3 gpm °Use 1.0 toot for single-family homes. b Use 2.0 feet for anything else. ' Potential for plugging B. Determine head requirements: 1. Elevation difference between pump and point of discharge. /b feet 2.Special head requirement: If pumping to a pressure distribution system, five feet for pressure required at manifold. if gravity systern, zero. S` feet Boit treatment 3. Friction loss system a. Enter friction loss table with gpm and pipe diameter. total 9 Read friction loss in feet per 100 feet from table. inlei -= dielevation fference F.L. _ 3 ft./100 ft of pipe pipe '` b. Determine total pipe length from pump to discharge - ---------------------------- ------ point. Estimate by adding 25 percent to pipe length for fitting ' -- loss. Equivalent pipe length times 1.25 = total pipe length x 1.25 = G 2.r feet c. Calculate total friction loss by multiplying friction loss Friction Loss in Plastic Pipe in ft/100 ft by equivalent pipe length. Per 100 feet Total friction loss = G 2-.,r x . 73 100 = . YG _ feetnominal pipe diameter 4.Total head required is the sum of elevation difference,special head flow rate 1.5" 2" 3" gpm requirements, and total friction loss. 20 2.47 0.73 0.11 6h + S + • YG (1) (2) (3c) 25 '3J3'. �1-1:1 0.16 Total head: /.: S- feet 30 5.23 1.55 0.23 35 6.96�: 2.06 0.30 is - 40 ? 8.91:.:r;`2'64 '.0:39:: 45 11.07 3.28 0.48 C. Pump selection 50 13.46 3.99 0.58 55 4.76 . ,0 70 1. A pump must be selected to deliver at least/ gpm 60 5.60 0.82 (Step A) with at least /S. feet of total head (Step B). 65 6.48 0.95 70 7.44 1.09