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3. Install traps and double risers where indicated,and where required to entrain oil in vertical runs. <br /> 4. Liquid lines may be installed level. <br /> J. Use fittings for all changes in direction and all branch connections. <br /> K. Install exposed piping at right angles or parallel to building walls. Diagonal runs are not permitted,unless expressly <br /> indicated. <br /> L. Install piping free of sags or bends and with ample space between piping to permit proper insulation applications. <br /> ' M. Conceal all pipe installations in walls, pipe chases, utility spaces, above ceilings, below grade or floors, unless <br /> indicated to be exposed to view. <br /> N. Install piping tight to slabs,beams,joists, columns,walls, and other permanent elements of the building. Provide <br /> space to permit insulation applications,with 1 inch clearance outside the insulation. Allow sufficient space above <br /> removable ceiling panels to allow for panel removal. <br /> O. Locate groups of pipe parallel to each other,spaced to permit applying insulation and servicing of valves. <br /> P. Exterior Wall Penetrations: Seal pipe penetrations through exterior walls using sleeves and mechanical sleeve seals. <br /> Pipe sleeves smaller than 6 inch shall be steel;pipe sleeves 6 inch and larger shall be sheet metal. <br /> Q. Interior Miscellaneous Penetration: Where pipes pass through interior walls, partitions, ceilings, or floors, the <br /> ' acoustic and airflow resisting characteristics shall be maintained. Seal pipe penetrations using sleeves and special <br /> sealers and material as prescribed in Division 7. <br /> R. Fire Barrier Penetrations: Where pipes pass through fire rated walls,partitions, ceilings, and floors, maintain the <br /> fire rated integrity. Refer to Division 7 for special sealers and materials. <br /> S. Make reductions in pipe sizes using eccentric reducer fittings installed with the level side down. <br /> T. Install strainers immediately ahead of each expansion valve, solenoid valve, hot gas bypass valve, compressor <br /> suction valve,and as required to protect refrigerant piping system components. <br /> U. Install moisture/liquid indicators in liquid lines between filter/driers and thermostatic expansion valves and in liquid <br /> line to receiver. <br /> ' 1. Install moisture/liquid indicators in lines larger than 2-1/8 inch OD,using a bypass line. <br /> V. Install unions to allow removal of solenoid valves,pressure regulating valves,expansion valves,and at connections <br /> to compressors and evaporators. <br /> ' W. Install flexible connectors at the inlet and discharge connection of compressors. <br /> ' 3.04 BANGERS AND SUPPORTS <br /> A. General: Hanger, supports, and anchors are specified in Division 15 Section "SUPPORTS AND ANCHORS." <br /> Conform to the table below for maximum spacing of supports. <br /> B. Install the following pipe attachments: <br /> 1. Adjustable steel clevis hangers for individual horizontal runs less than 20 feet in length. <br /> 2. Roller hangers and spring hangers for individual horizontal runs 20 feet or longer. <br /> 3. Pipe rollers complete supports for multiple horizontal runs,20 feet or longer supported by a trapeze. <br /> 15530-5 No.99132-CP2 <br />