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OSTP Pressure Distribution UNIVERSITY
<br /> iwinnesata Pdlution Design Worksheet OF MINNESOTA
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<br /> 1. Select Number of Perforated Loterals in system/zone: 3 �� Mio�m�
<br /> `! perioratwns spaaed 3�aVert' 2'of rcdc
<br /> (2 feet is minimum nnd 3 feet is maximum spvcing) _ �
<br /> 2.5 ft '?�- -
<br /> 2. Setect Perforotion Spacing: 9•;f�«k
<br /> 3. Select Perforotion Diameter Size 1/4 inch perfaation sizing:'/:to v.•
<br /> Periaration :2'to 3'
<br /> 4. Length of Laterals =Media Bed Length-2 Feet. Perforation cnn not be closer then 1 foot from edge. v 11.05.31
<br /> 38 _ 2ft = 36 ft
<br /> 5. Determine the Number of Perforation Spaces. Divide the Length of Laternls (Line 4) by the Perforation Spacing (Line 2)and
<br /> round down to the nearest whole number.
<br /> Number of Perforntion Spoces = 36 ft - 2.5 ft = 14 Spaces
<br /> 6. Number of Perforations per Loteral is equal to 1.0 plus the Number of Perfnration Spoces (Line 5).
<br /> Perforotions Per Laterol = 14 5paces + 1 = 15 Perfs. Per Lateral
<br /> Check tob(e below to verify the number of perforations per latera!guarontees less than a 10%discharge variQtion. The value is
<br /> double�f the a center mamfold is used. _
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<br /> 3l46 4+�Perforatiora
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<br /> 7. Total Number of Perforations equats the Number af Perforations per Lateral (Line 6)multiplied by the Number of
<br /> Perforated Loterals (Line 1).
<br /> 15 Perf. Per Lateral X ��Number of Perf. Laterals = 45 Total Number of Perf
<br /> 8. Calculate the Square Feet per Perforotion. Recommended vaiue is 4-10 ft 2 per perforation. "_`""��E�,,.�:���
<br /> ��«,���
<br /> Does not apply to At-Grades ""d�R� ,,, 'f,. °.,, '.,
<br /> Bed Area = Bed Width(ft)X Bed Length(ft) � �-�� �4`'� ��- -
<br /> ,s o.0 ns, o.sv o.A
<br /> 10 ft X 38 t� = 380 ftZ � �' � "
<br /> zs o� o�s o� t��
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<br /> Squnre Foot per Perforation =Bed Areo divided by the Totol Number of Perforations (Line 7). ..o o.�. o m 1 19 1:67
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<br /> �� a.em�wtm 3n6 a,�n w�u+r�n
<br /> 380 ftZ S 45 perforations - 8.4 ft2lperforations '�°°` ���n
<br /> owelun�wRh:1 ra inch p�tor�ciois
<br /> 2 feet Other etallhhma�a aid�t.15T5�w{[h'3f16-
<br /> 9. Select Minimum Average tlead: 1.0 ft '"�''°°,"'""''°`""�"°"'
<br /> 5 feac Other ataDttrM�a�4 and�:N6i5�wIN-11.8�Itrh
<br /> plA4�itbM
<br /> 10. Select Perforation Discharge (GPM)based on Table 111: 0.74 GPM per Perforation
<br /> 11. Determine required F(ow Rate by muttiplying the Total Number of Perforations (Line 7)by the Perforation Discharge (Line 10).
<br /> 45 Perforations X 0.74 GPM per Perforation = 34 GPM
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