N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 14-9.2

Current through Register Vol. 46, No. 53, December 31, 2024

Section 14-9.2 - Tube ends of water-tube boilers and superheaters

(a) The ends of all tubes, suspension tubes, and nipples shall be expanded and flared not less than one-eighth inch over the diameter of the tube hole on all water-tube boilers and superheaters, or they may be flared not less than one-eight inch, rolled and beaded, or flared, rolled and welded; or rolled and seal welded without flaring, provided the throat of the seal weld is not less than three-sixteenths inch, nor more than three-eighths inch, and the tubes are re-expanded after welding.

(b) Tube ends or weld necks may be fusion welded to the drums of water-tube boilers without expanding or flaring.

(c) Where pipe is used for tubes in water tube boilers, it may be screwed instead of rolled and flared. The ends of stub tubes may be closed by either forge or fusion welding.

(d) Tubes may be seal welded into fittings or headers for both boilers and superheaters after they have been expanded and flared, provided the material in the fittings or headers, does not contain carbon in excess of 0.35 percent.

(e) The ends of all tubes, suspension tubes, and nipples of water-tube boilers and superheaters shall project through the tube sheets or headers not less than one-quarter inch nor more than one- half inch before flaring. Where the tubes enter at an angle, the maximum limit of one-half inch shall apply only at the point of least projection.

N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 14-9.2