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OSTP Pressure Distribution <br /> UNIVERSITY ' ' <br /> Minnesota Pollution °, <br /> Control Agency Design Worksheet OF MINNESOTA t <br /> 12. Calculate the Square Feet per Perforation. Recommended value is 4-11 ft 2 per perforation. <br /> Perforation Discharge(GPM) <br /> Does not apply to At-Grades <br /> a. Bed Area = Bed Width(ft)X Bed Length(ft) Perforation Diameter <br /> Head( <br /> ft) <br /> 10 ft X 63 ft = 630 <br /> ft2 i '/a 3/76 r/R /4 <br /> 1.0' 0.18 0.41 0.56 0.74 <br /> b. Square Foot per Perforation =Bed Area divided by the Total Number of Perforations (Line 9). 1.5 0.22 0.51 0.69 0.9 <br /> 630 ft2 - 63 perforations = 10.0 ft2/perforations 2,0b 0.26 0.59 0.80 1.04 <br /> 2.5 0.29 0.65 0.89 1.17 <br /> 13. Select Minimum Average Head: 1.0 ft 3.0 0.32 0.72 0.98 1.28 <br /> 4.0 0.37 0.83 1.13 1.47 <br /> 14. Select Perforation Discharge (GPM)based on Table: 0.56 GPM per Perforation 5.0` 0.41 0.93 1.26 1.65 <br /> Dwellings with 3/16 inch to 1/4 inch <br /> 1 foot <br /> 15. Determine required Flow Rate by multiplying the Total Number of Perforations by the perforations <br /> Perforation Discharge. Dwellings with 1/8 inch perforations <br /> 63 Perfs X 0.56 GPM per Perforation= 36 GPM 2 feet Other establishments and MSTS with 3/16 <br /> inch to 1/4 inch perforations <br /> 16. Volume of Liquid Per Foot of Distribution Piping(Table II): 0.170 Gallons/ft 15feet Other establishments and MSTS with 1/8 inch <br /> perforations <br /> 17. Volume of Distribution Piping = <br /> Table!! <br /> =[Number of Perforated Laterals (Line 3)X Length of Laterals (Line 6)X Volume of Liquid in <br /> (Volume of Liquid Per Foot of Distribution Piping(Line 16)] Pipe <br /> 3 X 61 ft X 0.170 gal/ft = 31.1 Gallons Pipe Liquid <br /> Diameter Per Foot <br /> 18. Minimum Dose=Volume of Distribution Piping(Line 17)X 4 (inches) (Gallons) <br /> 31.1 gals X 4 = 124.4 Gallons 1 0.045 <br /> 1.25 0.078 <br /> 1.5 0.110 <br /> manifold pipet 2 0.170 <br /> 1 3 0.380 <br /> i <br /> ... i 4 0.661 <br /> pipe from pump ,_ _ <br /> V ,,-Cleanouts ' - <br /> clean outs i <br /> Iwo /' Manifold pipe. J <br /> 1i- 0 <br /> + <br /> ' alternate location ; '1�; J <br /> of pipe from pump <br /> `' ..%" Altemate location <br /> ` of pipe from pump <br /> Pi e from urn <br /> Comments/Special Design Considerations: <br />