Revised Specifications - the Public Building Commission of Chicago

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PEL Standard Specification_Rev 6/8/2010 Project Rev A_07/02/10 4. Compressor. K. Install filter dryers in liquid line between compressor and thermostatic expansion valve, and in the suction line at the compressor. L. Install receivers sized to accommodate pump-down charge. M. Install flexible connectors at compressors. 3.4 PIPING INSTALLATION A. Drawing plans, schematics, and diagrams indicate general location and arrangement of piping systems; indicated locations and arrangements were used to size pipe and calculate friction loss, expansion, pump sizing, and other design considerations. Install piping as indicated unless deviations to layout are approved on Shop Drawings. B. Install refrigerant piping according to ASHRAE 15. C. Install piping in concealed locations unless otherwise indicated and except in equipment rooms and service areas. D. Install piping indicated to be exposed and piping in equipment rooms and service areas at right angles or parallel to building walls. Diagonal runs are prohibited unless specifically indicated otherwise. E. Install piping above accessible ceilings to allow sufficient space for ceiling panel removal. F. Install piping adjacent to machines to allow service and maintenance. G. Install piping free of sags and bends. H. Install fittings for changes in direction and branch connections. I. Select system components with pressure rating equal to or greater than system operating pressure. J. Refer to Divisions 15 and 17 for solenoid valve controllers, control wiring, and sequence of operation. K. Install piping as short and direct as possible, with a minimum number of joints, elbows, and fittings. L. Arrange piping to allow inspection and service of refrigeration equipment. Install valves and specialties in accessible locations to allow for service and inspection. Install access doors or panels as specified in Division 8 if valves or equipment requiring maintenance is concealed behind finished surfaces. M. Install refrigerant piping in protective conduit where installed belowground. CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 15183-8 REFRIGERANT PIPING PBC-PROJECT# 09070
PEL Standard Specification_Rev 6/8/2010 Project Rev A_07/02/10 N. Install refrigerant piping in rigid or flexible conduit in locations where exposed to mechanical injury. O. Slope refrigerant piping as follows: 1. Install horizontal hot-gas discharge piping with a uniform slope downward away from compressor. 2. Install horizontal suction lines with a uniform slope downward to compressor. 3. Install traps and double risers to entrain oil in vertical runs. 4. Liquid lines may be installed level. P. When brazing, remove solenoid-valve coils and sight glasses; also remove valve stems, seats, and packing, and accessible internal parts of refrigerant specialties. Do not apply heat near expansion-valve bulb. Q. Install pipe sleeves at penetrations in exterior walls and floor assemblies. R. Seal penetrations through fire and smoke barriers according to Division 7. S. Install piping with adequate clearance between pipe and adjacent walls and hangers or between pipes for insulation installation. T. Install sleeves through floors, walls, or ceilings, sized to permit installation of fullthickness insulation. U. Seal pipe penetrations through exterior walls according to Division 7 for materials and methods. V. Identify refrigerant piping and valves according to Division 15. 3.5 PIPE JOINT CONSTRUCTION A. Ream ends of pipes and tubes and remove burrs. Bevel plain ends of steel pipe. B. Remove scale, slag, dirt, and debris from inside and outside of pipe and fittings before assembly. C. Brazed Joints: Construct joints according to AWS's "Brazing Handbook," Chapter "Pipe and Tube." 1. Use Type BcuP, copper-phosphorus alloy for joining copper socket fittings with copper pipe. 2. Use Type BAg, cadmium-free silver alloy for joining copper with bronze or steel. 3.6 HANGERS AND SUPPORTS A. Hanger, support, and anchor products are specified in Division 15. B. Install the following pipe attachments: CHICAGO POLICE DEPARTMENT 12 TH DISTRICT POLICE STATION 15183-9 REFRIGERANT PIPING PBC-PROJECT# 09070
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Revised Specifications - the Public Building Commission of Chicago

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