Laserfiche WebLink
OSTP Pressure Distribution <br />Design Worksheet <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 />ft X ft =ft2 <br />b.Square Foot per Perforation = Bed Area divided by the Total Number of Perforations . <br />ft2 ÷ =ft2/perforations <br />13. Select Minimum Average Head :ft <br />14. Select Perforation Discharge (GPM) based on Table: GPM per Perforation <br />15. <br />Perfs X GPM per Perforation = GPM <br />16.Volume of Liquid Per Foot of Distribution Piping (Table II): Gallons/ft <br />17.Volume of Distribution Piping = <br />X ft X gal/ft = Gallons <br />18. Minimum Delivered Volume = Volume of Distribution Piping X 4 <br />Gallons <br />Comments/Special Design Considerations: <br />38 <br />0.110 <br />380 <br />39 <br />39 <br />0.74 <br />10 380 <br />29 <br />Determine required Flow Rate by multiplying the Total Number of Perfs. by the Perforation Discharge. <br />0.74 <br />1.0 <br />perforations 9.7 <br />gals X 4 = <br />= [Number of Perforated Laterals X Length of Laterals X (Volume of <br />Liquid Per Foot of Distribution Piping] <br />11.9 <br />3 <br />47.5 <br />36 0.110 11.9