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1 <br />1.4.1 General Concepts <br />1. Proper installation is the key to <br />achieving highly -reliable, adhe- <br />sive -bonded, matching taper, bell <br />and spigot joint. <br />2. Matching taper angles on spigot <br />and bell ends make it possible to <br />lock-up a joint by wedging the <br />spigot into the bell so that it takes <br />significant force to separate them. <br />Proper lock-up is essential. <br />3. A verythin line of adhesive (called <br />the bond I ine orglue line) between <br />the two matching tapered surfaces <br />is essential to achieve optimum <br />joint strength. <br />4. Cool weather installations require <br />different bonding procedures from <br />warm weather installations. See <br />Section 6. <br />5. Proper installation results in joint <br />MANOR# <br />A <br />!WOW, - <br />BELL X SPIGOT JOINTIT <br />Figure 1.4.1 <br />strength equivalent to or stronger <br />than most piping systems. <br />6. To achieve the most reliable piping <br />system, it is essential that the in- <br />stallation crew be familiar with <br />the joining techniques described <br />in this manual. Note especially <br />Section 6. <br />7. Proper and safe methods of testing <br />are recommended to assure that <br />the bonded joints in the piping <br />system have been properly bonded <br />and cured. See Sections 6 and 7. <br />1.4.2 Bell and spigot joining method <br />The adhesive -bonded, tapered bell <br />and spigot joint is the primary joining <br />method for 2"-4" (50-100mm) pipe - <br />to -fittings. <br />The T.A.B. (threaded and bonded) <br />joint is the primary joining method <br />for pipe -to -couplings. The mechani- <br />.ddMMMP-iwrrH <br />cal locking action—when combined <br />with the adhesive—promotes positive <br />make-up of the joint and prevents <br />backout during adhesive curing. <br />Pipe is supplied with one end tapered <br />(the spigot) and the other end belled <br />(the integral bell or factory -bonded <br />coupling) to accept a tapered spigot. <br />Fittings are manufactured to accept <br />either the tapered spigot or T.A.B. <br />spigot end of the pipe. Tapers can be <br />made in the field with tools specially <br />designed for this purpose. (See Sec- <br />tion 5). Bells cannot be field -made. <br />When a belled end is needed, us a <br />bell x bell coupling. <br />Note: For pipe that is bundled in 15 - <br />ft. (5m) lengths, each bundle will <br />have an equal number of spigot x <br />spigot and bell x spigot pipe lengths. <br />l <br />T.A.B. JOINT <br />Figure 1.4.2 <br />El <br />r" I <br />