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B. Clean end of tube of depth of valve socket with steel wool,sand cloth,or a steel wire brush to a bright finish. Clean <br /> valve socket in same manner. <br /> C. Apply proper soldering flux in an even coat to inside of valve socket and outside of tube. <br /> D. Open gate and globe valves to full open position. <br /> ' E. Remove the cap and disc holder of swing check valves having composition discs. <br /> F. Insert tube into valve socket making sure the end rests against the shoulder inside valve. Rotate tube or valve <br /> ' slightly to ensure even distribution of the flux. <br /> G. Apply heat evenly to outside of valve around joint until solder will melt upon contact. Feed solder until it <br /> ' completely fills the joint around tube. Point torch away from valve seat and Avoid hot spots or overheating the <br /> valve. Once the solder starts cooling,remove excess amounts around the joint with a cloth or brush. <br /> 3.05 THREADED CONNECTIONS <br /> ' A. Note the internal length of threads in valve ends,and proximity of valve internal seat or wall,to determine how far <br /> pipe should be threaded into valve. <br /> ' B. Align threads at point of assembly. <br /> C. Apply appropriate tape or thread compound to the external pipe threads (except where dry seal threading is <br /> ' specified). <br /> D. Assemble joint,wrench tight. Wrench on valve shall be on the valve end into which the pipe is being threaded. <br /> 3.06 FLANGED CONNECTIONS <br /> A. Align flange surfaces parallel. <br /> B. Assemble joints by sequencing bolt tightening to make initial contact of flanges and gaskets as flat and parallel as <br /> possible. Use suitable lubricants on bolt threads. Tighten bolts gradually and uniformly using a torque wrench. <br /> C. For dead-end service, butterfly valves require flanges both upstream and downstream for proper shutoff and <br /> retention. <br /> 3.07 FIELD QUALITY CONTROL <br /> A. Tests: After piping systems have been tested and put into service,but before final adjusting and balancing,inspect <br /> each valve for leaks. Adjust or replace packing to stop leaks;replace valves if leak persists. <br /> 3.08 ADJUSTING AND CLEANING <br /> A. Cleaning: Clean mill scale, grease, and protective coatings from exterior of valves and prepare valves to receive <br /> finish painting or insulation. <br /> ' END OF SECTION 15100 <br /> 15100-7 No.99132-CP2 <br />