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. r-�.�- <br /> , � <br /> PII�SL•LECTION PRQC`�'U TR <br /> A. Detexatir�e paaip capadty: <br /> 1. Minimum suggested is 600 galIons per hour(10 gpm) to stay ahead of ' � <br /> water use rate. <br /> 2. Maximuat suggestied for deiivery to a drop box of a home system is 2,700 <br /> gaUons per hour(45 gpm)+to prevent buiId-up of pressure in drop box. <br /> 3. Use value from de3ign of pre3sure diatribution system. <br /> SELEZ'I'h'D PU11�C�PACTIY 3 I gpm � p�,p�I'Q'�' , <br /> � � <br /> B.Deterntine head requiremattx � Point of D'uch� <br /> •r r: <br /> 1. IIevation diEference betvveen�pumP�point oE discharge. n��Digaena <br /> ,; ., <br /> 2. If pumping to a pressure distribudon syst�n,add five feei for pressure <br /> required at manifoid , <br /> ���f� F-18b <br /> 3. Frfctiotlloss . � i��2v0 m�d�o incti <br /> a. Enter frictioa Ioss table with gp�m and pipe diameter. �� <br /> Read friction loss in feet per 100 feet from page�18. 10 0.69 0.20- <br /> F.L= fL/100 ft of �'�,� 12 �.96 0.28 <br /> /• S piPe <br /> : b. Determine total pipe length from pump to discharg�e • � i6 i.63 o a8 <br /> point, Add ZS parent to pipe length for fitting is zo3 0.60 <br /> loss,or use a fittin loas chart. valent i 20 Za7 0.73 0.11 <br /> g � p� 25 3.73 1.11 0.16 <br /> length-1.?5 �mes pipe length= � 30 5.23 1.55 a.23 <br /> ��_x 1..25�; '��_feei � 7•� 206' 0.30 <br /> C. Calculate total friction loss multi 1 �n � I1.07 264 0.39 <br /> � P� g 4S 14.73 3.2$ 0.48 <br /> frictfon loss in ft/100 ft by equivalent pipe length. 50 3.99 oS8 <br /> Total friction�oss= /. � x � ,S� _+Zpp= / , ! feet SS • a.76 0.70 <br /> 4. Total head required is the sum of elevation diEfer+ence, � � � 5.60 0.82 '. <br /> special head requirements,and total friction loss. � <br /> I_� + � +�_ . <br /> � (1) (?J (3v <br /> TOTAL HEAD ,�„_feet . � <br /> C. Pump selection <br /> 1. A m must be selected to deliver at least D-� <br /> pu p �,.L gpm (Step A)with at least <br /> �?�1 feet Of tOtal head(St�ep B). �*+�*m scrv.aa r�ows iN c�o►,s �c�e oor <br /> r+uwnot rYrt or R�1p[NCS`� <br /> , actipooe.s t n rs rs <br /> D. Total Pumpout Volume 2 ,00 m ��o sQx <br /> 1. To maximize pump life select sump size for 4 to 5 pump operations per day. , ' •'° � 2te �� <br /> 4 600 373 236 vmuN <br /> U �+4: // � �O]'LR pC!dOSe � r�o ,eo z�. r,�:r. <br /> 2. Caiculate drainbacic ; ,� �• � ;;o �'. <br /> 1. Determine total pipe ler�gth, (.r feet- " �Zoo sT� ,oe c:w„r,. <br /> 2. Determine liquid volume oF pipe, � 4/ gailons per 100 feei. (see page F 18) a�'���.. F-18a <br /> 3. Multiply length by volume: Drainback quantity= �;,,,r,,� ;�� c�uoR:e��oo r� <br /> �:v feet x 1 4� gallans/100 ft._�j_ga,llons. 1:• 4.4 <br /> 'Suggeseed drainback quantity is 10 percern of pumped quanrity. A larger drainback 1.25 7.•��, <br /> percentage will decrrase pump starion efficiency slightly but pumping en�rgy costs are <br /> usually a relatively small part of the total household enagy msa. 1.5 1�.58 <br /> 2 :17.43 <br /> 3. Totat pump out wlume equals dose volume+drainback 2,5 24,$7 ( <br /> t l�llons per dose+�gallons= I �_:� Total Gallons 3 3 8.4 <br /> 4 66.1 • <br />