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6.3.8 Metallic Pipe and Tube Bending
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Bending of Schedule 10 steel pipe, or any steel pipe of wall thickness equal to or greater than Schedule 10 and Types K and L copper tube, shall be permitted when bends are made with no kinks, ripples, distortions, or reductions in diameter or any noticeable deviations from round.
For Schedule 40 and copper tubing, the minimum radius of a bend shall be six pipe diameters for pipe sizes 2 in. (50 mm) and smaller and five pipe diameters for pipe sizes 21/2 in. (65 mm) and larger.
For all other steel pipe, the minimum radius of a bend shall be 12 pipe diameters for all sizes.
Bending of listed pipe and tubing shall be permitted as allowed by the listing.
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