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3. In Walls: Gas piping with welded joints and protective wrapping specified in <br /> "Protective Coating" Article in Part 2 may be installed in masonry walls(subject to <br /> approval of authority having jurisdiction). <br /> 4. Prohibited Locations: Do not install gas piping in or through circulating air ducts, <br /> clothes or trash chutes,chimneys or gas vents(flues),ventilating ducts,or <br /> dumbwaiter or elevator shafts. This does not apply to accessible above-ceiling space <br /> specified above. <br /> B. Drips and Sediment Traps: Install drips at points where condensate may collect. Include <br /> outlets of gas meters. Locate where readily accessible to permit cleaning and emptying. <br /> Do not install where condensate would be subject to freezing. <br /> 1. . Construct drips and sediment traps using tee fitting with bottom outlet plugged or <br /> capped. Use minimum-length nipple of 3 pipe diameters,but not less than 3 inches <br /> long,and same size as connected pipe. Install with space between bottom of drip and <br /> floor for removal of plug or cap. <br /> C. Conceal pipe installations in walls,pipe spaces,utility spaces,above ceilings,below <br /> grade or floors,and in floor channels,except where indicated to be exposed to view. <br /> D. Install gas piping at a uniform grade of 1/4 inch in 15 feet,upward toward risers. Install <br /> piping upward from service risers to meters,service regulator when meter is not provided, <br /> and equipment. <br /> E. Make reductions in pipe sizes using eccentric reducer fittings installed with the level side <br /> down. <br /> F. Connect branch piping from top or side of horizontal piping. <br /> G. Install unions in pipes 2 inches and smaller,adjacent to each valve,at final connection to <br /> each piece of equipment,and elsewhere as indicated. Unions are not required on flanged <br /> • devices. <br /> H. Install dielectric fittings(unions and flanges)with 1 ferrous and 1 brass or bronze-end <br /> connections,separated by insulating material,where piping of dissimilar metals are <br /> joined. <br /> I. Install dielectric fittings(unions and flanges)with 2 ferrous end connections,separated by <br /> insulating material,at outlet from gas meter and,where indicated,for ferrous piping. <br /> J. Install flanges on valves,specialties,and equipment having 2-1/2-inch and larger <br /> connections. <br /> K. Install strainers on the supply side of each control valve,gas pressure regulator,solenoid <br /> valve,and elsewhere as indicated. <br /> ADDENDUM#2 <br /> 1607.001 - ORONO ICE ARENA(CP-2) Page 15488 - 10 <br />