Russ says concrete is 150 lbs per cu ft. You want 25 lbs so that is 1/6 of a cu ft.
Now we need to figure the volume of your pipe per inch. Radius x radius x height x pie 1.5 x 1.5 x 1 x 3.14 = 7.065 So you have 7.065 cu in per inch of pipe.
1728 cu inches in a cubic foot and you need 1/6 1728 / 6 = 288 cu inches
So you need 288 cu inches to make 25 lbs and your pipe holds 7.065 cu inches per inch. 288 / 7.065 = 40.764 So your pipe needs to be 40.764 inches long or just over 40 3/4 inches.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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