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OSTP Basic Pump Selection Design Minnesota Pollution Worksheet UNIVERSITY Control Agency OF MINNESOTA 1. PUMP CAPACITY Project ID: Pumping to Gravity or Pressure Distribution: Q Gravity Q pressure Selection required 1. If pumping to gravity enter the gallon per minute of the pump: GPM (10-45 gpm) 2. If pumping to a pressurized distribution system: 38.0 GPM 3. Enter pump description: 2. HEAD REQUIREMENTS �r A. Elevation Difference 17 ft �„ga between pump and point of discharge: � W Ekvatq*%, B. Distribution Head Loss: �ft aiMnmcr C. Additional Head Loss: �ft Idue to special equipment,etc.) - --- -- ------------- Lir Table I.Friction Loss in Plastic Pipe per 1DisrA00ft ..___�._._.__._.T------- _. .. bulrion tread Voss Flow Rate Pi Diameter(inches) Gravity Distribution = Oft -- ----- - IGPM) 1 1.25 1.5 2 Pressure Distribution based on Minimum Average Head 10 I 9.1 3.1 1.3 0.3 Value on Pressure Distribution Worksheet: 12 12.8 4.3 1.8 0.4 rAnli num Avera a Head Distribution Head Loss 14 17.0 5.7 2.4 0.6 1 ft 5ft 16 1 21.8 7.3 I 3.0 0.7 2ft 6ft 18 9.1 j 3.8 0.9 Sft 10ft 20 11.1 4.6 1.1 25 16.8 6.9 1.7 D. 1.Supply Pipe Diameter: 2.0 in 30 i 23.5 9.7 2.4 35 12.9 3.2 2.Supply Pipe Length: 113 ft 40 1 i 16.5 4.1 E. Friction Loss in Plastic Pipe per 100ft from Table 1: 45 20.5 5.0 50 i 6.1 Friction Loss= 3.67 ft per 100ft of pipe 55 7.3 60 s ( 8.6 F. Determine Equivalent Pipe Length from pump discharge to soil dispersal area discharge 65 i 10.0 point. Estimate by adding 25%to supply pipe length for fitting toss. Supply Pipe Length 70 ( ? I 11.4 (D.2) X 1.25=Equivalent Pipe Length 75 j 13.0 85 16.4 113 ft X 1.25 = 14t.3 ft 95 i 20.1 G. Calculate Supply Friction Loss by multiplying Friction Loss Per 100ft (Line E)by the Equivalent Pipe Length (Line F)and divide by 100. Supply Friction Loss= 3.67 ft per 100ft X 147.3 it - 100 = 5.2 ft H. Total Head requirement is the sum of the Elevation Difference (Line A).the Distribution Head Loss(Line B).Additional Head Loss(Line C),and the Supply Friction Loss(Line G) 17.0 ft 5.0 ft + E==ft 5.2 ft = 27.2 ft 3. PUMP SELECTION A pump must be selected to deliver at least 38.0 GPM(Line 1 or Line 2)with at least 27.2 feet of total head. Comments: