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Vacuum Flow Table

     
 
Vacuum Flow Through Orifices in SCFM
  
 
 
     
 
Orifice
Diameter (In)"		 Vacuum in inches of mercury
2" 4" 6" 8" 10" 12" 14" 18" 24"
1/64" .018 .026 .032 .037 .041 .045 .048 .055 .063
1/32" .074 .100 .128 .148 .165 .180 .195 .220 .250
1/16" .300 .420 .517 .595 .660 .725 .780 .880 1.00
1/8" 1.20 1.68 2.06 2.37 2.64 2.89 3.12 3.53 4.04
1/4" 4.78 6.74 8.25 9.52 10.6 11.6 12.4 14.0 16.2
3/8" 10.8 15.2 18.5 21.4 23.8 26.0 28.0 31.8 36.4
1/2" 19.1 27.0 33.0 38.5 42.3 46.3 50.0 65.5 64.6
5/8" 30.0 42.2 51.7 59.5 66.2 72.6 78.0 88.0 101
3/4" 43.0 60.6 74.0 85.3 95.2 104 112 127 145
7/8" 58.8 82.6 101 116 130 142 153 173 198
1" 76.5 108 131 152 169 185 200 225 258