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. OSTP Basic Pump Selection Design UNIVERSITY Minnesota Pollution ,,. M :;, Worksheet OF MINNESOTA - Control Agency 1. PUMP CAPACITY Project ID: v 06.12.13 Pumping to Gravity or Pressure Distribution: i 0 Gravity b 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: 29.0 GPM 3. Enter pump description: 2. HEAD REQUIREMENTS s treatment system• Q point or discharge A. Elevation Difference 17 ft t"---, o+eneK4" between pump and point of discharge: ;-, _ Net pipeElevation B. Distribution Head Loss: 5 ft a S difference C. Additional Head Loss: ft(due to special equipment,etc.) - 7 • Table(.Friction Loss in Plastic Pipe per 100ft Distribution Head Loss -- Flow Rate Pipe Diameter(inches) Gravity Distribution = Oft (GPM) 1 1.25 1.5 I 2 Pressure Distribution based on Minimum Average Head 10 9.1 3.1 1.3 0.3 Value on Pressure Distribution Worksheet: 12 12.8 4.3 1.8 0.4 Minimum Average Head Distribution Head Loss 14 17.0 5.7 2.4 i 0.6 1ft 5ft 16 21.8 7.3 3.0 0.7 2ft bft 18 I 9.1 3.8 0.9 5ft 10ft 20 I 11.1 4.6 1.1 25 I 16.8 6.9 1.7 D. 1.Supply Pipe Diameter: 2.0 in 30 23.5 9.7 1 2.4 35 12.9 3.2 2.Supply Pipe Length: 75 ft 40 16.5 4.1 E. Friction Loss in Plastic Pipe per 100ft from Table I: 45 20.5 5.0 50 6.1 Friction Loss= 2.23 ft per 100ft of pipe 55 7.3 60 8.6 F. Determine Equivalent Pipe Length from pump discharge to soil dispersal area discharge 65 10.0 point. Estimate by adding 25%to supply pipe length for fitting loss. Supply Pipe Length 70 11.4 (D.2) X 1.25=Equivalent Pipe Length 75 I 13.0 75 ft X 1.25 = 93.8 ft 85 16.4 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= 2.23 ft per 100ft X 93.8 ft + 100 2.1 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 + ft + 2.1 ft = 24.1 ft 3. PUMP SELECTION A pump must be selected to deliver at least 29.0 GPM(Line 1 or Line 2)with at least 24.1 feet of total head. Comments: