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Re: [OM] OT - Buoyancy of PVC pipe: was, Camouflage Paint ?

Subject: Re: [OM] OT - Buoyancy of PVC pipe: was, Camouflage Paint ?
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Tue, 11 Nov 2003 22:27:36 -0500
Regarding the buoyancy of 1-1/2" Schedule 40 PVC tubes used for tripod leg protection in water.

Weight per foot = 0.51 lbs.
Inside diameter = 1.61"
Weight of water per cubic inch = .0361 lbs.

Internal displacement per foot =
12 x pi x (1.61/2)*2 = 24.42 cubic inches

buoyancy per foot =
(24.42 cubic inches x 0.0361 lbs) - 0.51 lbs =
0.37 lbs

Three legs at three feet each gives a lifting force of
3 x 3 x 0.37 = 3.33 lbs

or thereabouts. Presumably the actual is much less since not all three feet of the pipes length will likely be under water. Also, I have not corrected for the difference in weight between fresh and seawater :-)

Anyhow, the tripod is not likely to go floating away.

Chuck Norcutt
Woburn, Massachusetts, USA


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