(a) All tube bends must be reasonably smooth and free from injurious dinges, folds, or crimps, and the section outside the bend must be free from any injurious deformations of the tube due to the bending operation.

(b) No tube to show an out-of-roundness at any point of the bend in excess of ⁵/₃₂ inch as determined by calipering the outside of the tube, on a circumferential radial to the arc of the bend, and deducting the least diameter so found from the greater diameter,

out of roundness A and B measured at any point in the bend.

(c) At no point of the bend shall the diameter of the tube be more than one-eighth inch less than the minimum allowable diameter of the tube.

(d) Tolerance given apply to tubes with angle of bend less than 180 degrees and tubes bent in one plane.

(e) After coiling, the tubing in coil boilers shall be free from injurious dinges, folds, or crimps and the outside of the coils shall be free from any injurious deformation.