HDPE pipe can use a rubber ring, if the rubber ring is properly sealed with a steel gasket. The rubber ring must be placed in a groove in the pipe and then the steel gasket is placed on top of it.
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It depends on how long the pipe is. 4" diameter is just the 2 dimensional measurement, therefore you would not be able to determine the volume of that pipe.
it will vary by Tool Joint OD and ID. FYI 7"OD x ID 4" HT55 is 52,600 Ft lbs
measure the radius of the pipe. (half the diameter - the width of the pipe) then measure the length of the pipe. then use the formula pi (3.14) x radius2 x length. the answer is the volume in the pipe
You have to determine how long the crack is and then cut out the bad section allowing for that which you can not see (hairline cracks). You will probably need the correct size pipe and connectors (couplings S x S) and PVC cement and PVC primer, a fine saw for cutting the pipe. Dry fit everything making sure the new section of pipe is of the correct length. There is a small situation in which you need the flexibility in the old plumbing to be able to attach the new section. You just have to think it thru. Ken
A piece of pipe is 303/4 inches long. If five pieces, each 41/3 inches long, are cut from the pipe, how many inches of pipe remain?