hey Knick;

To calculate the volume of a cylinder in gallons per foot......... square the I.D. (in inches) and divide by 24.5 then multiply by length in feet.

Example: 6" I.D. pipe x 10' length

6x6=36

36/24.5= 1.47 gal/ft

1.47x10'= 14.7 gallons

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