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<br /> F-17
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<br /> i pL7MP SELECTION PROCEDURE
<br /> E!O PERFORATIdJ OF A PERFORATED LATER/L
<br /> a Determine pump capacity: �-�..�
<br /> Gravity Distribution T�_��
<br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of _ :,
<br /> a c»�nw cee.k t��v.
<br /> water use rate. � `""''s'"`"'` �"'°""..:.,""' "'`�."'°
<br /> %�..,.�. ,�:.,'
<br /> 2. Maximum sugges r delivery to a drop box of a home system is 2,700 ., . ^�*� ��a���� �«���^�^��,
<br /> Nti(Ii H�o� Too
<br /> gallons per ho 45 m o prevent build-up of pressure in drop box. . ,,•,,,„ ; _u �.,., ,2•„ �,,.
<br /> Id el Rxt I.urw
<br /> PY1pO11M�lO(<IM ol
<br /> Pressure Distibution ���� �""^" `"•"'
<br /> 3. a. Select number of perforated laterals
<br /> o.,..,.��.�� .,.d... �,��
<br /> b. Select perforadon spacing= feet �,,.,,,,,,,�5„d�,,.,,
<br /> c. Subtract 2 ft from the rock layer length.
<br /> ��re�ga
<br /> -2 ft. = feet�
<br /> d. Deterrrune the number of spaces bet�veen perforations.
<br /> Length pesf. spacing=_ft.� ft. = spaces Required Perforation Diuh e
<br /> e. _spaces+ 1 = perforations/lateral �gauo��r�,�ce�gp�
<br /> f. Multiply perforations per laterai by number of laterals to D��Se , , ,
<br /> get tocal number of perforations. W��,� x �� ��= perforations. H�d 'S2� ""' ` °�°��
<br /> g' -� X a��--gP m.
<br /> 1.Oa 0.56 0.74
<br /> SELEC'I'ED PUMP CAPACITY -�S gpm Yj')aI� 2.Ob �.8� 1.04
<br /> B.Determine head requirements: a. Use for single family homes
<br /> 1. ElevaHon difference between pump and point of discharge. b. Use for all other applicaeons
<br /> �_feet
<br /> � 2. If pumping to a pressure distribution system,five feet for pressure
<br /> required at manifold if gravity system,zero.
<br /> �' feet
<br /> 3. Friction loss
<br /> a. Enter friction loss table with gpm and pipe diameter. P�P�L«�g�h
<br /> Read friction loss in feet per 100 feet from table. � Poin�of Dischargc
<br /> F.�. = 3,at� ft./100 ft oE pipe 9so
<br /> b. Deternvne total pipe length from pump to discharge Flcvacion Differencc�
<br /> point Add 25 percent to pipe length for fitting p�p _�:�
<br /> loss,or use a fitting loss chart. Equivalent pipe
<br /> ]ength - 1.25 dmes pipe length= F-18b
<br /> �x1.25 = I � `� feet
<br /> c. Calculate total fricbon loss b multi 1 no 1.5 inch 2.0 inch 3.0 inch
<br /> y p � o �m Friaim lm pa 100 ft d pipc
<br /> friction loss in ft/100 h by equivalent pipe length.
<br /> Total friction loss= -3 .�`d x +100= feet 10 0.69 0.20
<br /> ) 1 � � 12 0.96 0.28
<br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38
<br /> special head requirements,and tota] friction loss. 16 1.63 0.48
<br /> 18 2.03 0.60
<br /> 20 2.47 0.73 0.11
<br /> a,� + - +�_ 25 3J3 1.11 0.16
<br /> (1) (2) (3c) 30 5.23 1.55 0.23
<br /> 35 7.90 2.06 0.30
<br /> 40 11.07 2.64 0.39
<br /> TOTAL HEAD a�feet 45 1a.73 3.28 0.48
<br /> 50 3.99 0.58
<br /> 55 4.76 0.70
<br /> C. Pump selection 5o s.bo o.s2
<br /> ; 1. A pump must be selected to deliver at least
<br /> ,_:�' ��gpm (Step A) with at least �,lo feet of total head (Step B).
<br /> YYl�1-
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