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3.5 PIPE APPLICATIONS A. General: Flanges,unions,transition and special fittings,and valves with pressure ratings same or higher than system pressure rating may be used in applications below,except where specified otherwise. B. Low-Pressure Natural Gas Systems,above Ground within Building: Use the following: 1. 2 Inches and Smaller: Steel pipe,malleable-iron,threaded fittings,and threaded joints. 2. 2-1t2 Inches and Larger: Steel pipe,butt-welding fittings,and welded joints. C. Natural Gas Systems,Buried within Building: Use steel pipe,butt-welding fittings,and welded joints. Encase gas carrier piping in containment conduits. D. Underground Containment Conduits: Use steel pipe,butt-welding fittings,and welded joints. 3.6 VALVE APPLICATIONS A. Use gas valves for shutoff to appliances. B. Use gas valves of sizes indicated for gas service piping,meters,mains,and where indicated. 3.7 JOINT CONSTRUCTION A. Use materials suitable for natural gas service. 1. Brazed Joints: Make joints with brazing alloy having melting point greater than 1000 deg F(538 deg C). Brazing alloys containing phosphorus are prohibited. 3.8 PIPING INSTALLATIONS A. Concealed Locations: Except as specified below,install concealed gas piping in an air-tight vented conduit constructed of Schedule 40 seamless black steel with welded joints. 1. Above-Ceiling Locations: Gas piping may be installed in accessible above-ceiling spaces (subject to approval of the authority having jurisdiction),when such spaces are not used as a plenum. Do not locate valves in such spaces. 2. In Partitions: Do not install concealed piping in solid partitions. Protect tubing against physical damage when it is installed inside partitions or hollow walls. This does not apply to tubing passing through partitions or walls. ADDENDUM#2 1607.001 -ORONO ICE ARENA(CP-2) Page 15488 -9