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OSTP Pump Selection Design UNIVERSITY Minnesota Pollution Worksheet OF MINNESOTA Atismisp, Control Agency 10. Equivalent length of pipe fittings. Equivalent Length Factors(ft.)for PVC Pipe Fittings Section 10 is for Collection Systems ONLY and does NOT need to be Pipe Diameter(in.) completed for individual subsurface sewage treatment systems. Fitting Type 114 2 3 Quantity X Equivalent Length Factor=Equivalent Length Gate Valve 1.07 1.38 2.04 90 Deg Elbow 4.03 5.17 7.67 Fitting Type Quantity Equivalent Equivalent 45 Deg Elbow 2.15 2.76 4.09 Length Factor Length(ft) Tee-Flow Thru 2.68 3.45 5.11 Tee-Branch Flow 8.05 10.30 15.30 Gate Valve X - Swing Check Valve 13.40 17.20 25.50 90 Deg Elbow X = f Angle Valve 20.10 25.80 38.40 Globe Valve 45.60 58.60 86.90 45 Deg Elbow X = I Butterfly Valve - 7.75 11.50 Tee-Flow Thru X Tee-Branch Flow X = NOTE:Equivalent length values for PVC pipe fittings are based on calculations using the Hazen- Swing Check Valve X Williams Equation. See Advanced Designs for SSTS Angle Valve X = for equation. Other pipe material may require X different equivalent length factors. Verify other Globe Valve equivalent length factors with pipe material Butterfly Valve X - manufacturer. Valve 10 X NOTE:System installer should contact system designer if the number of fittings varies from the Valve 11 X = design to the actual installation. A. Sum of Equivalent Length due to pipe fittings: ft Hazen-Williams Equation for h B. Total Pipe Length =Supply Pipe Length(5.8) +Equivalent Pipe Length(9.A.) 10) 5 11 -- * (0--c ")t. * I ft + ft - ft .1 D-1 S7 C. Hazen-Williams friction loss due to pipe fittings and supply pipe(ht): Q in gpm L in feet D in inches C= 130 (10.5 .• Pipe Diameter"7) X ( Flow Rate = Constant)" X Total Pipe Length(10.6) (10.5 : 1n4.81) X ( gpm 4-130),.85 X ft = ft 11. Total Head requirement is the sum of the Elevation Difference (Line 3),the Distribution Head Loss(Line 4),Additional Head Loss(Line 5), and either Supply Friction Loss(Line 9),or Friction Loss from the Supply Pipe and Pipe Fittings for collection systems(Line 10.C) NOTE:Supply Friction Loss(Line 8)need ONLY be used if NOT a collection system. NOTE:Friction Loss from the Supply Pipe and Pipe Fittings(Line 9.C)need ONLY be used if system is a collection system. 11.0 ft5.0 ft + ft 1.9 ft - 17.9 ft 3. PUMP SELECTION A pump must be selected to deliver at least 36 GPM(Line 1 or Line 2)with at least 18 feet of total head. Comments: Pump type