255.313 Bends and elbows.

(a)Each field bend in steel pipe must comply with the following criteria:#

(1)A bend must not impair the serviceability of the pipe.#

(2)Each bend must have a smooth contour and be free from buckling, cracks, or any other mechanical damage.#

(b)On pipe containing a longitudinal weld, the longitudinal weld must be as near as practicable to the neutral axis of the bend unless:#

(1)the bend is made with an internal bending mandrel; or#

(2)the pipe is 12 inches (305 millimeters) or less in outside diameter or has a diameter to wall thickness ratio less than 70.#

(c)Each circumferential weld of steel pipe which is located where the stress during bending causes a permanent deformation in the pipe must be nondestructively tested after the bending process.#

(d)An operator may not install plastic pipe with a bend radius that is less than the minimum bend radius specified by the manufacturer for the diameter of the pipe being installed.#

(e)An operator may not install plastic pipe with a bend radius that is less than the minimum bend radius specified by the manufacturer for the diameter of the pipe being installed.#