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3.03 PIPING INSTALLATION <br /> A. General Locations and Arrangements: Drawings(plans,schematics,and diagrams)indicate the general location and <br /> arrangement of the piping systems. Location and arrangement of piping layout take into consideration pipe sizing <br /> ' and friction loss, expansion, pump sizing, and other design considerations. So far as practical, install piping as <br /> indicated. <br /> B. Use fittings for all changes in direction and branch connections. <br /> C. Install exposed piping at right angles or parallel to building walls. Diagonal runs are not permitted unless expressly <br /> indicated. <br /> D. Install piping free of sags or bends and with ample space between piping to permit proper insulation applications. <br /> ' E. 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 /> F. 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 /> ' G. Locate groups of pipes parallel to each other,spaced to permit applying full insulation and servicing of valves. <br /> H. Install drains at low points in mains,risers,and branch lines consisting of a tee fitting,3/4-inch ball valve,and short <br /> ' 3/4-inch threaded nipple and cap. <br /> I. Exterior Wall Penetrations: Seal pipe penetrations through exterior walls with sleeves and mechanical sleeve seals. <br /> Pipe sleeves smaller than 6 inches shall be galvanized steel pipe; pipe sleeves 6 inches and larger shall be <br /> ' galvanized steel sheet metal. <br /> J. Interior Miscellaneous Penetration: Where pipes pass through interior walls, partitions, ceiling, 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 /> K. Fire Barrier Penetrations: Where pipes pass though fire-rated walls, partitions, ceilings, and floors, maintain the <br /> fire-rated integrity. Refer to Division 7 for special sealers and materials. <br /> L. Install piping with 1/32-inch-per-foot(1/4 percent)downward slope towards drain point. <br /> 3.04 HANGERS AND SUPPORTS <br /> ' A. General: Hanger, support, and anchor devices conforming to MSS SP-69 are specified in Division 15 Section <br /> 15140"Supports and Anchors." Conform to the table below for maximum spacing of supports: <br /> B. Pipe Attachments: Install the following: <br /> 1. Adjustable steel clevis hangers,MSS Type 1,for individual horizontal runs less than 20 feet in length. <br /> ' 2. Adjustable roller hangers, MSS Type 43, and spring hangers, MSS Type 41 with Type 49, for individual <br /> horizontal runs 20 feet and longer. <br /> 3. Pipe roll,complete MSS Type 44 for multiple horizontal runs,20 feet or longer,support on a trapeze. <br /> 4. Spring hangers to support vertical runs. <br /> 15411-7 No.99132-CP2 <br />