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ENVIRONMENTAL HEALTH <br />G�R;_.RTMENT <br />Note: For Dualoy pipe, two-piece concentric reducers are <br />available for terminating the containment in sizes 6" x 4" (150 <br />x 100 mm), 4" x 3" (100 x 75 mm), 3" x 2" (75 x 50 mm) and 3" <br />x 11/2" (75 x 38 mm) with or without NPT threaded outlet and <br />pre -assembled galvanized pipe nipple and coupling. The large <br />end of the concentric reducer is bonded to the scarfed end of <br />the containment pipe, the small end is bonded to the sanded <br />surface of the primary pipe. <br />JOINT PREP <br />Installation Preparation <br />Before bonding the two-piece containment fittings, the installa- <br />tion procedures should be reviewed with the installation crew <br />members. <br />Cleaning the Bonding Surfaces <br />It is required that all bonding surfaces are cleaned before <br />bonding. DO NOT TOUCH THE BONDING SURFACES OR <br />ALLOW THEM TO BECOME CONTAMINATED AFTER CLEAN- <br />ING. <br />Acceptable cleaning methods are as follows: <br />• Sand all bonding surfaces until restored to factory -fresh <br />condition, removing any contamination. <br />• Dirt contamination can be removed by water washing. Be <br />sure the surfaces are dry and re -sanded before bonding. <br />• Sand all surfaces that have been exposed to sunlight and <br />have turned yellow or brown in color. <br />• Use of a solvent as a cleaning method is optional. Some <br />cleaning solvents are acetone, alcohol, methylene chlo- <br />ride, and methyl ethyl ketone. After cleaning, be sure any <br />residual solvent has evaporated before applying adhe- <br />sive. DO NOT USE SOLVENTS THAT LEAVE AN OIL FILM <br />ON THE BONDING SURFACES. <br />Warning: Some degreasers and solvents are extremely flam- <br />mable. Be sure to read warning labels on containers. Never <br />use gasoline, turpentine or diesel fuel to clean joints. <br />51 <br />