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OSTP Pressure Distribution <br /> UNIVERSITY ,s-k, ,..,-,-,,,,t,r <br /> Minnesota Pollution a "4---4a` <br /> Control Agency Design Worksheet OF MINNESOTA ., ,.„.....%, -- <br /> 12. Calculate the Square Feet per Perforation. Recommended value is 4-11 ft 2 per perforation. 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(ft) <br /> 10 ft X 63 ft = 630 ft2 <br /> 1 'fie '/ib 7/': '6 <br /> i.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 2.0° 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 /> 15. Determine required Flow Rate bymultiplyingthe Total Number ofPerforations bythe I foot <br /> q f perforations <br /> Perforation Discharge. Dwellings with 1/8 inch perforations <br /> 63 Perfs X 0.56 GPM per Perforation= 36 GPM Z feet Other establishments and MSTS with 3116 <br /> inch to 1/4 inch perforations <br /> 16. Volume of Liquid Per Foot of Distribution Piping(Table II): 0.170 Gallons/ft 5 feet Other establishments and MSTS with 1/8 inch <br /> perforations <br /> 17. Volume of Distribution Piping = <br /> Table II <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 /> 1 0.045 <br /> 31.1 gals X 4 = 124.4 Gallons 1.25 0.078 <br /> 1.5 0.110 <br /> manifold pipe\ 2 0.170 <br /> 1 3 0.380 <br /> 4 0.661 <br /> pipe from pump <br /> .000000000000000,00.00... N4,444,..0 <br /> Cleanouts _ <br /> clean outs s <br /> Manifold pipe <br /> V alternate location � J <br /> of pipe from pump ' • <br /> `,".%' Alternate location <br /> ISh.... ` of pipe from pump <br /> \/ Pi a from ump <br /> Comments/Special Design Considerations: <br />