N.Y. Comp. Codes R. & Regs. tit. 16 § 255.239

Current through Register Vol. 46, No. 41, October 9, 2024

Section 255.239 - Stress relieving

(a) Except as provided in subdivision (f) of this section, each weld on carbon steel that has a carbon content in excess of 0.32 percent (heat analysis) or a carbon equivalent (C + 1/4 Mn) in excess of 0.65 percent (heat analysis) must be stress relieved as prescribed in section VIII of the ASME Boiler and Pressure Vessel Code (as described in section 10.3 of this Title).

(b) Except as provided in subdivision (f) of this section, each weld on carbon steel that has a carbon content of less than 0.32 percent (heat analysis) or a carbon equivalent (C + 1/4 Mn) of less than 0.65 percent (heat analysis) must be thermally stress relieved when conditions exist that would cause the weld to cool at a rate detrimental to the quality of the weld.

(c) Except as provided in subdivision (f) of this section, each weld on carbon steel pipe with a wall thickness of more than 11/4 inches (32 millimeters) must be stress relieved.

(d) When a weld connects pipe or components that are of different thickness, the wall thickness to be used in determining whether stress relieving is required under this section is:

(1) in the case of pipe connections, the thicker of the two pipes joined; or

(2) in the case of branch connections, slip-on flanges, or socket weld fittings, the thickness of the pipe run or header.

(e) Each weld of different materials must be stress relieved, if either material requires stress relieving under this section.

(f) Notwithstanding subdivisions (a), (b) and (c) of this section, stress relieving is not required for the following:

(1) a fillet or groove weld one-half inch (13 millimeters), or less, in size (leg) that attaches a connection two inches (51 millimeters), or less, in diameter; or

(2) a fillet or groove weld three-eighths inch (9.5 millimeters), or less, in groove size that attaches a supporting member or other nonpressure attachment.

(g) Stress relieving required by this section must be performed at a temperature of at least 1,100° F (593° C) for carbon steels and at least 1,200° F (649° C) for ferritic alloy steels. When stress relieving a weld between steel materials with different stress relieving temperatures, the higher temperature must be used.

(h) When stress relieving, the temperature must be monitored to ensure that a uniform temperature is maintained and that the proper stress relieving cycle is accomplished.

N.Y. Comp. Codes R. & Regs. Tit. 16 § 255.239