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1 <br /> ' N. All piping shall be firestopped when penetrating any fire or smoke rated wall. Firestopping shall be placed in steel <br /> sleeves which surround the pipe and are at least the length of the thickness of the wall. Firestopping materials may <br /> be any putty, tape, or pre-manufactured sleeve application,that meets prevailing codes. Refer to Division 7: <br /> Firestopping. <br /> ' O. Where exposed piping passes through walls or ceilings, provide chrome escutcheons which completely cover the <br /> penetration. <br /> ' 3.04 PIPE JOINT CONSTRUCTION <br /> ' A. Welded Joints: AWS D10.9,Level AR-3. <br /> B. Threaded Joints: conform to ANSI B1.20.1, tapered pipe threads for field cut threads. Join pipe, fittings, and <br /> valves as follows: <br /> 1. Note the internal length of threads in fittings or valve ends,and proximity of internal seat or wall,to determine <br /> how far pipe should be threaded into joint. <br /> ' 2. Align threads at point of assembly. <br /> 3. Apply appropriate tape or thread compound to the external pipe'threads. <br /> 4. Assemble joint to appropriate thread depth. When using a wrench on valves place the wrench on the valve end <br /> into which the pipe is being threaded. <br /> ' 5. Damaged Threads: Do not use pipe with threads which are corroded or damaged. If a weld opens during <br /> cutting or threading operations,that portion of pipe shall not be used. <br /> ' C. Flanged Joints: Align flanges surfaces parallel. Assemble joints by sequencing bolt tightening to make initial <br /> contact of flanges and gaskets as flat and parallel as possible. Use suitable lubricants on bolt threads. Tighten bolts <br /> gradually and uniformly to appropriate torque specified by the bolt manufacturer. <br /> tD. Mechanical Grooved Joints: cut or roll grooves on pipe ends dimensionally compatible with the couplings. <br /> E. End Treatment: After cutting pipe lengths,remove burrs and fins from pipe ends. <br /> 3.05 VALVE INSTALLATIONS <br /> ' A. General: Install fire protection specialty valves, fittings, and specialties in accordance with the manufacturer's <br /> written instructions,NFPA 13 and 14,and the authority having jurisdiction. <br /> B. Gate Valves: Install supervised-open gate valves so located to control all sources of water supply except fire <br /> department connections. Where there is more than one control valve, provide permanently marked identification <br /> signs indicating the portion of the system controlled by each valve. Refer to Division 15 Section 15190 <br /> "Mechanical Identification"and 3.09 below for valve tags and signs. <br /> C. Install check valves in each water supply connection. <br /> D. Double Detector Check Valves: Install in proper direction of flow in a location to detect system leakage and <br /> unauthorized use of water,and to prevent backflow into public water mains. Install bypass meter,with gate valves <br /> on each side of the meter to permit meter removal,and check valve downstream from the meter. <br /> ' 3.06 SPRINKLER HEAD INSTALLATIONS <br /> A. Use proper tools to prevent damage during installations. <br /> ' 15300-7 No.99132-CP2 <br />