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panhandle_shovelheadrider · Novice Joined: 06 Jul 2010 Posts: 59

Assuming that the INNER DIAMETER of the PVC pipe is 4" (...likely not the case, so you'll need to recalculate for your pipe's dimensions):

The volume of the pipe would be calculated as follows:
4" diameter = 2" radius
volume_cylinder = Pi*r^2*L; where r = 2" and L = 12"
the cylinder therefore has a capacity of 150.8 cubic inches.

A gallon of water has the volume of 231 cubic inches.

Your pipe can hold 0.653 gallons of water.

You'll need about 18.38 inch lengths of 4" PVC to hold each gallon of water. Again, these calculations rely on the INNER DIAMETER of the pipe being measured at 4" - if this is an outer diameter measurement, the above calculation for the capacity is OVERstated; the 18.38" calculation is UNDERstated. .653x20'=13.08 gal - wall thickness?

Fredo · Posted: Sun Jul 18, 2010 11:00 am Post subject:

Why the hell do you put the same post on two different threads? Do you think we don't understand the first time we read it? You made your point the first time, so get off your soap box.........Fredo

panhandle_shovelheadrider · Novice Joined: 06 Jul 2010 Posts: 59

Culvan · Posted: Tue Jul 20, 2010 1:30 am Post subject:

4" schedule 40 PVC pipe has an inside diameter of 3.998". That changes your math by ~.15 cubic inches per linear foot or 0.1%.

I really like this site, but his notes on pipe are very handy for stuff like this.
http://www.gizmology.net/pipe.htm

I was looking into doing something similar with a 8" or 12" pipe that I could use as a degassing chamber. It could find a dual purpose as extra storage for the former.

Andy