1211.2.2 Installation.
MC § 1211.2.2
The installation of new steam piping systems shall be conducted as follows: 1. Installations, including any welding, shall be subject to special inspection.
2.Welders shall be qualified for all required pipe sizes, wall thicknesses and positions in accordance with the ASME Boiler and Pressure Vessel Code, Section IX. Requalification is required every five years or sooner if the commissioner has a specific reason to doubt a welder's ability to make acceptable welds.
3.Welder qualification testing shall be performed by an approved agency listed with the department, and the inspector witnessing the test shall be an authorized AWS Certified Welding Inspector. If the testing is by radiography, the test specimen shall be evaluated by personnel having a minimum radiography qualification of Level II in accordance with the ASNT, Document No. SNT-TC-1A, Supplement A. A successful radiographic test of a production weld made within the 6 months prior to requalification may be considered as an acceptable requalification test.
4.Copies of the certified welder qualification reports shall be maintained by the responsible welding agency and the company performing the welding, and shall be made available upon request to the department.
5.No reports from any welding inspection agency shall be accepted unless such agency has first requested and obtained approval from the department in accordance with rules of the department.
6.Pipe welding shall conform to the following: 6.1. All piping over 2 inches (50.8 mm) shall be butt-welded. Piping 2 inches (50.8 mm) and under may be socket-welded or threaded, providing Schedule 80 piping is utilized. 6.2. Threaded piping may continue to be used for existing construction in sizes of 6 inches (152.4 mm) and under. 6.3. Where welding is not feasible, the commissioner may allow an acceptable alternative.
7.Radiographic examination, when required, shall be performed on butt-welds in accordance with ASME B31.1 based on the piping system design pressure and shall be as follows: Piping System Design PressurePercentage90 psig (620.5 kPa) or belowNot Required91 psig (627.4 kPa) to 150 psig (1034.2 kPa)10 at RandomOver 150 psig (1034.2 kPa)100 However, if, in the opinion of the engineer responsible for special inspection, radiographic examination is not required for piping at pressure between 90 psig (620.5 kPa) and 150 psig (1034.2 kPa), the engineer shall so specify in writing, and the final report on the installation may omit the foregoing, and be predicated on all of the other requirements noted in this section, and a hydrostatic test.
