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Minnesota Pollution <br />Control Agency <br />OSTP Pressure Distribution <br />• UNIVERSITY Des1gn Worksheet oF MINNEsoTA <br />12. Calculate the Square Feet per Perforation. Recommended value is 4-11 ft 2 per perforation. <br />Does not apply to At-Grades <br />a. Bed Area = Bed Width (ft) X Bed Length (ft) <br />,_____1 _o ___.lft X .._I _63_1 ft = .___63_0_ ..... ltt2 <br />b. Square Foot per Perforation = Bed Area divided by the Total Number of Perforations. <br />....__6_3_o _ _,lft2 +j ,_ __ 6_3 _ __,I perforations = 10.0 ltt2 /perforations <br />13. Select Minimum Average Head: ... l __ 1_._o_ ..... ltt <br />14. Select Perforation Discharge (GPM) based on Table: 0.56 IGPM per Perforation <br />15. Determine required Flow Rate by multiplying the Total Number of Perfs. by the Perforation Discharge. <br />.___6_3 _ __,I Perfs X I 0.56 IGPM per Perforation= ...__3_6 _____.I GPM <br />16. Volume of Liquid Per Foot of Distribution Piping (Table II) : 0.170 !Gallons/ft <br />17. Volume of Distribution Piping = <br />= [Number of Perforated Laterals X Length of Laterals X (Volume of <br />Liquid Per Foot of Distribution Piping) <br />,___3 _ __.I xi,__ _6_1 _I ft xi 0.170 lgal/ft = 1 31.1 <br />18. Minimum Delivered Volume = Volume of Distribution Piping X 4 <br />.___3_1._1 _ _,jgals X 4 = 124.4 !Gallons <br />mani o pipe 1 <br />_ -Cleanouts -- <br />Comments/Special Design Considerations: <br />I Gallons <br />Table II <br />Volume of Liquid in <br />Pipe <br />Pipe Liquid <br />Diameter Per.Foot <br />.(inches) (Gallons) <br />1 0.045 <br />1.25 0.078 <br />1.5 0.110 <br />2 0.170 <br />3 0.380 <br />4 0.661 <br />-----