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Section 1210 High-Pressure Steam Piping Systems
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For purposes of this section, the replacement of existing steam piping systems, the installation of a new system in existing buildings, as well as installations in buildings hereafter constructed, shall be considered to be new high-pressure steam piping systems. The following requirements are applicable:
The design of new steam piping systems shall be conducted as follows:
1. The system shall be designed by an engineer. An application and plans shall be filed and the approval of the department obtained. The plans and application shall contain, but not be limited to, the following information:
1.1. Size and location of all steam piping.
1.2 The operating pressures and temperatures.
1.3 The location, type, specifications and details of all expansion joints.
1.4 The design, size, material and location of all anchors, guides and auxiliary steel, and the stresses thereon.
2. Systems using utility street steam shall be designed for a pressure of 200 psig (1379 kPa) and 413°F (212°C) up to and including the steam pressure reducing valve or valves which reduce the pressure of 90 psig (621 kPa) or below. For steam pressures between 90 psig (621 kPa) and 16 psig (110 kPa), the system shall be designed for 125 psig (108 kPa).
The installation of new steam piping systems shall be conducted as follows:
1. Installations, including any welding, shall be by special inspection by the engineer responsible for the design, or by an engineer acceptable to him or her.
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 three years or sooner if the commissioner has a specific reason to doubt a welder's ability to make sound welds.
3. Welder qualification testing shall be performed by an agency listed with the department, and if the testing is by radiography, the inspection shall have a minimum radiography qualification of Level II in accordance with the ASNT, Document No. SNT-TC-1A.
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 (51 mm) shall be butt-welded. Piping 2 inches (76 mm) and under may be socket-welded or threaded.
6.2 Threaded piping may continue to be used for existing construction in sizes of 6 inches (152 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 pressure and shall be as follows:
|90 psig (621 kPa) or below||Not Required|
|91 psig (627 kPa) to
150 psig (1034 kPa)
|10 at Random|
|Over 150 psig (1034 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 (621 kPa) and 150 psig (1034 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.
The commissioner, where deemed necessary, shall require the replacement or relocation of any joints, guides or anchors. The commissioner shall cause the joints in potentially hazardous locations, such as those that are located adjacent to tenant occupied spaces, to be relocated, unless means exist or are provided for eliminating the hazard.
Existing steam piping systems shall be in accordance with Sections 1210.3.1 through 1210.3.3. Upon the completion of a new high-pressure steam piping system and department approval of same, the rules relating to maintenance requirements and the keeping of records for existing high-pressure steam piping systems shall apply.
Expansion joints, anchorage and guides shall be inspected as follows:
1. Expansion joints shall be inspected weekly.
2. The anchorage and guides shall be inspected annually. Exposure of the structural attachments to the buildings of the anchorages or guides shall not be required..
No joint, anchorage or guides shall be repaired, replaced or relocated without a work permit issued by the department. The application for the permit shall contain all pertinent information and shall be filed by an engineer knowledgeable as to high-pressure steam piping systems. The engineer shall be responsible for the special inspection of the proposed work in accordance with the approved application. This provision shall not apply to the repacking of a slip or ball joint; however, records of such repacking shall be kept in the inspection records as provided in Section 1210.3.1, Item 3. When, in the opinion of the engineer, the requirement for prior department approval would create an imminent health or safety hazard, the engineer may permit the work to proceed without prior approval. In such cases, the engineer shall, prior to the repair, replacement or relocation, notify by telephone the borough commissioner of the borough in which the building is located; and, if the emergency occurs at other than normal working hours, he or she shall notify the department in a manner prescribed by the commissioner. This shall be followed by the filing of the application for department approval as specified in Section 28-105.4.1 of the Administrative Code.
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