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PLUMBING PIPING SYSTEMS <br />Section 15400 <br />15-1207 <br />1. Form couplings by first annealing area at end of tube where expansion will occur. <br />Insert tube expander to die size required and expand tube end to accept tubing <br />of same size. <br />2. Resulting joint is minimum of three times as long as thickness of tube and brazed <br />using B-CuP series filler metal. <br />Weld pipe joints in accordance with recognized industry practice and as follows: <br />1. Welding shall be done by qualified welders in a first-class, workmanlike manner, <br />conforming to the American Standard Code for Pressure Piping USA B-31-1 and <br />B-31-1 A. <br />2. Bevel pipe ends at a 37.5 degree angle where possible, smooth rough cuts, and <br />clean to remove slag, metal particles, and dirt. <br />3. Do not weld -out piping system imperfections by tack -welding procedures; <br />re -fabricate to comply with requirements. <br />At Contractor's option, install forged branch -connection fittings wherever branch pipe of <br />two pipe sizes smaller than main pipe is indicated; or install regular "T" fitting. <br />K. Flanged Joints: Match flanges within piping system and at connections with valves and <br />equipment. Clean flange faces and install gaskets. Tighten bolts to provide uniform <br />compression of gaskets. <br />L. Hubless Cast -Iron Joints: Comply with coupling manufacturer's installation instructions <br />and in accordance with CISPI Standard 310, latest edition. <br />M. Make joints between cast-iron and steel pipe same as above with special adapter as <br />required. <br />N. Make joints in PVC pipe with PVC -type couplings and rubber rings. <br />O. Check final location of rubber rings within the couplings with gage or as recommended <br />by the manufacturer. Make joints between PVC pipe and cast iron pipe or fittings using <br />cast iron adapter fittings, installed as recommended by the manufacturer. <br />15 <br />