2013-00159 - septic - Laserfiche WebLink

Home Browse Search

'1 _ OSTP Non-Level Pressure Distribution Minnesota Pollution UNIVERSITY - `''i Control Agency Design Worksheet OF MINNESOTA ,Z�� 7. Calculate Flow in Gallons Per Minute for Lateral 1 Perforation Discharge(onto) A.Select Perforation Spacing: 2.0 feet = 24.0 irlches Perforation Diameter B. Length of Laterals=Length of STA(Line 1)-2 Feet Head(ft) '/e '/r. '/u '/, 32 -2 ft= 30 1.0' 0.18 0.41 0.56 0.74 1.5 0.22 0.51 0.69 0.9 C.Number of Perforation Spaces =Divide the Length of Lateral 1(7.B)by the 20° 0.26 0.59 0.80 1.04 2.5 0.29 0.65 0.89 1.17 Perforation Spacing(Line 7.A)and round down to the nearest whole number. 3.0 0.32 0.72 0.98 1.28 Check Table II to ensure the maximum number of perforations is not exceeded. 4.0 0.37 0.83 1.13 1.47 30 ft/ 2.0 ft= 15 Spaces 5.0` 0.41 0.93 1.26 1.65 1 foot Dwellings with 3/16 inch to 1/4 inch D. Select Type of Manifold Connection (End or Center): Q End 0 Centerperforations Dwellings with 1/8 inch perforations E.Number of Perforations=Number of Perforation Spaces(Line 11)+1. 2 feet Other establishments and MSTS with 3/16 inch to 1/4 inch perforations 15 Spaces+1= 16 Other establishments and MSTS with 1/8 inch 5 feet perforations F. Flow Rate for Lateral 1 =Number of Perforations X Flow Rate Per Hole for Lateral I 16 x 0.56 = 9.0 GPM for Lateral 1 8. Calculate the Gallons Per Minute Per Foot for Lateral 1. This value will then be used to make sure that the gallons per minute per foot is equivalent in each lateral Gallons Per Length= Flow Rate for Lateral 1 divided by Length of Lateral 1 9.0 + 30 = 0.30 GPM/Foot Maximum Number of Perforations Per Lateral to Guarantee<10%Discharge Variation '/,Inch Perforations 7/32 Inch Perforations Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(Inches) Perforation Spacing(Feet)I 1 114 114 2 3 (Feet) 1 116 114 2 3 2 10 13 18 30 60 2 11 16 21 34 68 2/ 8 12 16 28 54 214 10 14 20 32 64 3 8 12 16 25 52 3 9 14 19 30 60 3/16 Inch Perforations 1/8 Inch Perforations Pipe Diameter(Inches) Perforation Spacing Pipe Diameter(Inches) Perforation Spacing(Feet) 1 114 114 2 3 (Feet) 1 114 115 2 3 2 12 18 26 46 87 2 21 33 44 74 149 214 12 17 24 40 80 24 20 30 41 69 135 3 12 16 22 37 75 3 20 29 38 64 128 _ 9. Balance flows for other lateral lengths,spacing,and size. If you end up with large perforation spacing(3'is max)lower the initial spacing for Lateral 1(Line 7.A)or the perforation size(Line 6) Lateral 2 GPM=Length of Lateral X Gallons Per Minute Per Foot(Line 8) 30 ft X 0.30 GPM/ft= 9.0 GPM Number of Perforations=GPM/Flow Rate for Lateral 2(Line 6.2) Check Table to ensure the maximum number of perforations is not exceeded. 9.0 + 0.56 = 16 Perforations Select Type of Manifold Connection(End or Center): ID End ❑Cep Spacing=(Length of Lateral)/(Number of Perforations-1) ( 30 ) + ( 16 Perforations-1) = 2.0 ft = 24.00 inches Lateral 3 GPM=Length of Lateral X Gallons Per Minute Per Foot(Line 8) 30 ft x 0.30 GPM/Ft= 9.0 GPM Number of Perforations=GPM/Flow Rate for Lateral 3(Line 6.3) Check Table to ensure the maximum number of perforations is not exceeded. 9.0 0.56 = 16 Perforations Select Type of Manifold Connection(End or Center): 06x ❑Center Spacing=(Length of Lateral)/(Number of Perforations-1) ( 30 ) + ( 16 Perforations-1) = 2.0 ft = 24.00 ink