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<br /> ` ' PUMP SEL$CTION PROCEDUR$
<br /> : {;
<br /> ,,at � j �- A. Determine pump capacity: '
<br /> i .
<br /> ; � i . , 1. .Minimum euggeated ia 600 gallone per hour (10 Rpm) -
<br /> ,,, �' _ ,,�.? , � to atay ahead of water uge rete
<br /> ; t. � ti 2. Maximum euggested for delivery to a drop bax o� g home
<br /> ; . , system ie 2700 gallone per hour (45 gpm) to preveht
<br /> � buildup of presaure in drop box
<br /> t ' � 3. Use value from design of preasure diatr�butiot► eqetem
<br /> ,.
<br /> ,< � .
<br /> #` i . SELECTED PUMP CAPACITY . . . . . . . . . . . . � . . � � Bpm
<br /> � �
<br /> .,�� .
<br /> :
<br /> �--'' ?` j B. Determine head requirementes '
<br /> ♦. ''� { , , • ` . ` .
<br /> tY�` " ' � • 1. , Elevation difference between pump and point of diecharae c.v feet
<br /> , , ,>�'� ,
<br /> '-� ? ' , 2. If pumping to a preseure dietribution ey�tem� add S feet �
<br /> � ; for pressure required at manifold . .� . . . . . . . . `� fe�t
<br /> '' '� ' 3. � Friction lose •
<br /> � .
<br /> " + : a. Enter friction loes table With gpm and pipe diemeter.
<br /> � # .+ � � �� • � Read friction loee in feet per l00 feet from pege F-18. •
<br /> xj ` _' ' /� �'� F. L. � �+ ftf100 ft �
<br /> >,: � ; � b. Determine total pipe length from pump to diecharge ,
<br /> �' ;'' ; � . . point. Add 25 percent to pipe length for f itting . ,
<br /> �' � ! lose, or uae a f itting loea chart. Lquivale�it pipe '
<br /> ' .' ; , ';- length � �.25 timee pipe l�ngth � 1.25 x �"� � �n�. � f�aet
<br /> , .-. � ,
<br /> ' � ' � � � �_ c. Calculate total friction loes by mulriplqing -'
<br /> , � � , � . � .
<br /> w � •';� � �� ;� friction loes in ft/100 ft by equivalent pipe
<br /> i � : ` length. . • 1L. �
<br /> ��` ! ' Total friction loes � �h�• 5 - x c�iv.. (��-�f,�/oO � � • �� feet
<br /> � � 4. Total head required is the sum of e evation d-- iff�rence,
<br /> � i i
<br /> ;, ,.,. s apecial head requiremente, and total.friction loe9. '
<br /> � ("� + t i + ,. .�j �
<br /> , f
<br /> ,� ;
<br /> -6..
<br /> j .: � TOTAL HF.AD . . . . . . . . . . . . . . . . . . . . . . I�� � J f ee t
<br /> ,�:'�"� i �
<br /> : , ? C. Pump selection
<br /> ,�w:�'l, . �
<br /> '� i : 1. A pump muat be selected to deliver at leaet �J gpm
<br /> +�< ��` - � With at leaet ��, � feet of total head.
<br /> �:,, �
<br /> �� , '
<br /> ��^�; �,i �
<br /> D. To maximize pump life select eump eize for 4 to 5 pump
<br /> _q;��� + . operatione per day.
<br /> _ , , . ,
<br /> �: .� �
<br /> ,-'
<br /> a� ; < : f E. Calculate drainback � , �
<br /> �,.. .t .f, �
<br /> � `�� ' 1. Determine total pipe length, feet.
<br /> .:.: � ;
<br /> ,`;;�,= 2. Determine liquid volume of pipe, gallone per
<br /> ,;�;:-�; � ' 100 feet. (See page E-18)
<br /> ', { i. 3. Multiply length by volumet Drainback quantity �
<br /> :'��� � ' feet x gallone/100 ft • gallons
<br /> �i � 4. Suggested drainback quantitq ie 10 percent of pumped quantity.
<br /> � ; -� � � A larger drainback percentaRe wi11 decrease pump etation
<br /> � "`�..-� efficiencq slightlq but pumping energq coets are usually a
<br /> ; relatively small part of the total houaehold energq coeta. �
<br /> 1 ,
<br /> ;:�
<br /> . `?:'...;�,;:„, i . -
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