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6.5.2.4 Welding Requirements
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Welds between pipe and welding outlet fittings shall be permitted to be attached by full penetration welds, partial penetration groove welds, or fillet welds.
The minimum throat thickness shall be not less than the thickness of the pipe, the thickness of the welding fitting, or 3/16 in. (5 mm), whichever is least.
Circumferential butt joints shall be cut, beveled, and fit so that full penetration is achievable.
Full penetration welding shall not be required.
Where slip-on flanges are welded to pipe with a single fillet weld, the weld shall be on the hub side of the flange and the minimum throat weld thickness shall not be less than 1.25 times the pipe wall thickness or the hub thickness, whichever is less.
Face welds on the internal face of the flange shall be permitted as a water seal in addition to the hub weld required in 6.5.2.4.5.
Tabs for longitudinal earthquake bracing shall have minimum throat weld thickness not less than 1.25 times the pipe wall thickness and welded on both sides of the longest dimension.
When welding is performed, the following shall apply:
- Holes in piping for outlets shall be cut to the full inside diameter of fittings prior to welding in place of the fittings.
- Discs shall be retrieved.
- Openings cut into piping shall be smooth bore, and all internal slag and welding residue shall be removed.
- Fittings shall not penetrate the internal diameter of the piping.
- Steel plates shall not be welded to the ends of piping or fittings.
- Fittings shall not be modified.
- Nuts, clips, eye rods, angle brackets, or other fasteners shall not be welded to pipe or fittings, except as permitted in 6.5.2.2.3 and 6.5.2.4.7.
- Completed welds shall be free from cracks, incomplete fusion, surface porosity greater than 1/16 in. (1.6 mm) diameter, and undercut deeper than 25 percent of the wall thickness or 1/32 in. (0.8 mm), whichever is less.
- Completed circumferential butt weld reinforcement shall not exceed 3/32 in. (2.4 mm).
Related Code Sections
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Standard for the Installation of Sprinkler Systems 2013 of New York State > 6 System Components and Hardware > 6.5 Joining of Pipe and Fittings > 6.5.2 Welded Pipe and Fittings > 6.5.2.4 Welding Requirements > 6.5.2.4.5
6.5.2.4.5 System Components and Hardware,
Where slip-on flanges are welded to pipe with a single fillet weld, the weld shall be on the hub side of the flange and the minimum throat weld ...
Standard for the Installation of Sprinkler Systems 2016 of New York State > 6 System Components and Hardware > 6.5 Joining of Pipe and Fittings > 6.5.2 Welded Pipe and Fittings > 6.5.2.4 Welding Requirements > 6.5.2.4.5