how tight should pvc fittings be

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how tight should pvc fittings be插图

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  • Can you over tighten PVC pipe fittings?

  • Don’t over-tighten. Do use the same Schedule threaded fittings with the same Schedule pipe and fittings. On threaded male PVC fittings, each successive thread is slightly larger in diameter than the one before it. Female threads get successively smaller.

  • How tight do you have to tighten national pipe threads?

  • How tight do you have to tighten National Pipe Thread? They should be hand tightened and then another 1 or 2 turns, but no more. More turns will put to much pressure on the fitting and may crack it and cause a leak. The Tensile Stress created by tightening the fitting beyond hand tight and 1 or 2 more turns will crack the female fittings.

  • How many turns should you tighten plumbing fittings?

  • They should be hand tightened and then another 1 or 2 turns, but no more. More turns will put to much pressure on the fitting and may crack it and cause a leak. The Tensile Stress created by tightening the fitting beyond hand tight and 1 or 2 more turns will crack the female fittings.

  • What is the tensile strength of PVC pipe?

  • The resistance of PVC is 400,000 pounds per square inch (psi). The strain per turn past finger tight for one-inch PVC pipe is .00447, so the stress per turn is 1,788 psi. Thus, a one-inch threaded PVC joint that is tightened four turns past finger tight will develop a tensile stress of 7,152 psi.

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