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1 �..� a .�� • . ; • �a. ft <br />A. Determine pump capacity-. <br />Gravity Distribution <br />1. Minimum suggested is 600 gallons per hour (10 gpm) to stay ahead of <br />water use rate. <br />2. Maximum suggested for delivery to a drop box of a home system is 2,700 <br />gallons per hour (45 gpm) to prevent build-up of pressure in drop box. <br />Pressure Dlstibution <br />3. a. Select number of perforated laterals -3 _ <br />b. Select perforation spacing a 3 feet. <br />c. Sublact 2 Et. from the`layer length. <br />NV - 2 ft. _ � feet. <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing• `!8 ft. +,� ft. - IC spaces <br />e. I spaces + 1-1Z perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />ttotal nurnberofperforations. x-L2�-imperforations. <br />S. x aawr 38 spin, <br />SELECTED PUMP CAPACITY 3 gpm <br />B. Determine head requirements - <br />1. Elevation difference betweerepurrip and point of discharge. <br />_9feet <br />2. U 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 i cr. <br />Read friction loss in feet per 100 Leet from table. <br />F.L. • 2 • Y/ ft -/100 f t of pipeAW <br />b. Determine total pipe length from dtsch�a g¢ <br />point. Add 25 percent to pipe length o tong <br />loss, or use a fitting loss chart. Equivalent pipe <br />length -1.25 times ipe length - <br />_xlM- /06 feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss - 2-W x i D 100= _ feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />6 + S + 3 <br />(1) W (3d <br />TOTAL HEAD feet <br />C Pump selection <br />1. A pump mu;t be selected to deliver at least <br />.3 P gpm (Step A) with at least ,, ZY feet of total head (Step B). <br />F-17 <br />bD MWDRATION OF A PERFORATED LATERAL <br />b� Cw« <br />= "i <br />'?'�'•' d wr.w IWr 1. iv <br />• 1+r7 w to" <br />�1 .wwM <br />w CO Orn w <br />+� « � u w• <br />• I tr- w u.. w� « L....« <br />Rpuired Perforation Diseharto <br />in 6aL'om per minute (gpm <br />Discharge <br />Hvd`�� <br />0.69 <br />r�rr <br />(foot) <br />12 <br />0.96 <br />1.0a <br />0.56 <br />0.74 <br />2.Ob <br />0.80 • <br />1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />1 Pipe Length <br />Point of Mcharge <br />0zP__E]"_"zD�iffC==1 <br />F -18b <br />. 13 inch 2.0 inch Minch <br />gm %lois to- P- loo n d t4" <br />10 <br />0.69 <br />0.20 <br />12 <br />0.96 <br />0.28 <br />14 <br />1.28 <br />0.38 <br />16 <br />1.63 <br />0.48 <br />18 <br />2.03 <br />0.60 <br />20 <br />2.47 <br />0.73 <br />0.11 <br />25 <br />3.73 <br />1.11 <br />0.16 <br />30 <br />5.23 <br />L0 <br />0.23 <br />35 <br />7.90 <br />(2.W <br />0.30 <br />40 <br />11.07 <br />0.39 <br />45 <br />14.73 <br />3.28 <br />0.48 <br />SO <br />3.99 <br />0.18 <br />SS <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />