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PLUMBING PIPING SYSTEMS Section 15400 15-1207 3.04 INSTALLATION OF NATURAL GAS PIPING: A. Run piping generally level, free of unnecessary bends, arranged to conform to the building requirements, and to suit clearance for other mechanical work such as ducts, flues, conduits, and other work B. Use sealants on metal gas piping threads which are chemically resistant to natural gas. Use sealants sparingly, and apply to only male threads of metal joints. C. Connect gas piping to each gas-fired equipment item, with drip leg and shutoff gas cock. Comply with equipment manufacturer's instructions. 1. Appliance fuel connectors, as indicated in 1202 of the California Plumbing Code, are not acceptable for connection of equipment, except where specifically indicated on the Contract Documents. D. Install Polyethylene Pipe, where defined, in accordance with ASTM D2774 "Standard Recommended Practice for Underground Installation of Thermoplastic Pressure Piping", and as required by Manufacturer's Installation Instructions. 1. Polyethylene Pipe fittings shall be joined in accordance with pipe manufacturers instructions. 2. Connection of plastic pipe with metal pipe shall be only outside underground with ASTM D2513 category I transition fittings. 3. Gas pipe risers to above grade, shall be metallic and shall be wrapped or coated to a point at least six inches above grade. 4. When riser connects underground to plastic pipe, the underground horizontal metallic portion of the riser shall extend at least 30 inches before connecting to the plastic pipe. 5. Heat -fusion joints shall be made in accordance with qualified procedures that have been established and proven by test to produce gas tight joints at least as strong as the pipe or tubing being joined. Joints shall be made with the joining method recommended by the pipe manufacturer. 6. Plastic pipe shall be buried with an electrically continuous copper tracer wire (Min. size #10) and tape to facilitate locating. One end shall be brought above ground at a riser. E. Install exposed polished or enameled connections from fixtures or equipment with special care, showing no tool marks or threads at fittings. F. Cap or plug openings in pipe and fittings immediately to exclude all dirt until fixtures are installed or final connections made. G. Use reducing fittings where any change in pipe size occurs. Bushings shall not be used. H. Couplings shall not be used except where required pipe runs between fittings are longer than a standard length of the type of pipe being used and except where their use is specifically reviewed by the Architect. Conceal piping in finished portions of building, above the floor line, except where otherwise shown or noted. Cutting of walls and floors shall be held to the minimum possible to secure the proper installation. 9