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PUNIP SELECTION PIZOCE�►URE Perforation Discharges in gpm <br /> A. Determine pump capacity: perforation diameter <br /> �-� gravity distribution head inches <br /> �. Minimum required discharge is 10 gpm <br /> (feet) 1/8* 3/16 7/32 1/4 <br /> 1.Oa 0.18 0.42 0.56 0.74 <br /> 2. Maximum suggested discharge is 45 gpm <br /> pressure distribution 2.Ob 0,26 0.59 0,80 1.04 <br /> see pressure design worksheeet 5.0 0,41 0,94 1 .26 1 .65 <br /> Selected pump capacity' � J gpm ° Use 1.0 foot for single-famlly homes. <br /> b Use 2.0 feet for anything else. <br /> ' Potentlal for plugging <br /> B. Determine head requireme�nts: <br /> 1. Elevation difference between pump and point of discharge. <br /> _�_feet <br /> 2. Special head requirement: <br /> If pumping to a pressure distributicro system, five feet for pressure <br /> required at manifold. If gravity syst:em, zero. � feet so��treatment <br /> system ao aa•,a�:•�a. ) u 1 D�c� <br /> 3. Friction loss <br /> a. Enter friction loss table with gprr�and pipe diameter. totg p�pe <br /> len th <br /> Read friction loss in feet per 100 feet from table. e�evotion <br /> Inlet '' difference <br /> .: <br /> F.L. _�ft./100 ft of pipe pipe ;; �, <br /> ,, ------- -- -� <br /> -----�oc�� �� <br /> �, , <br /> b. Determine total pipe length from pump to discharge '��������������� <br /> �,� <br /> point. Estimate by adding 25 perce�lt to pipe length Eor fitting <br /> los�.�E�uivalent pipe length times ]..25 =total pipe length <br /> x 1.25 = a�s feet <br /> c. Calculate total friction loss by mizltiplying friction loss Friction Loss in Piastic Pipe <br /> Per 100 feet <br /> in ft/100 ft by equivalent pipe length. <br /> nominal <br /> Total friction loss =��X,a a J �100 = S feet pipe diameter <br /> flow rate 1.5" 2" 3" <br /> 4.Total head required is the sum of elevation difference, special head pm <br /> requirements, and total friction loss. 20 2.47 0.73 0.11 <br /> �+ _y_+ S _ (1) (2) (3c) 25.. _ : � �3;73 �>"_l, 11. .' '0,16 <br /> Total head: 2� feet 30 5.23 1.55 0.23 <br /> 35 6.96 ��6 � 0,30 <br /> 40 ;;8:91 . �.;:'2:64' ' 0.39 <br /> . .:...... ....._.. . .._._.__... . __. <br /> 45 1107 3.28 0.48 <br /> C. Pump selection 50 13 46 3.99 0,58 <br /> 55 _., ..., ;4 76,,. ::OJO : <br /> l 60 5.60 0.82 <br /> 1. A pump must be selected to deli.ver at least�._gpm <br /> (Step A) with at least ?.c7 feet of'total head (Step B). 65 6.48 0,95 <br /> 7p 7.44 1,09 <br />