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1.6.8 Inspecting for potential NOTE: When using heat assist, bead is white and tacky causes of joint failure the pipe may bend if it is under throughout, then the adhesive 1. Joint backout stress while curing. In this case, was contaminated with water it is extremely difficult to before it was applied to the When assembling a bell and determine if the pipe is bent joint. This will also produce an spigot joint,a bead of adhesive because of heating or if it is a improperly cured joint. is normally formed at the edge cocked joint. Avoid making up Caution: The adhesive bead of the bell. If the joint is not pipe and fitting joints when will cure faster than the adhe- locked up and backs out before pipe is under stress. the adhesive cures, the bead sive in the joint. It is important will no longer be next to the 3. Improperly cured joint that the joint not be pressurized until it has been subjected to edge of the bell.NOTE:To form If the adhesive bead is soft or the proper time-temperature a good adhesive bead, it is best flexible,the adhesive is not suf- cure cycle. A temperature ver- to apply an excess of adhesive ficiently cured. If the bead is sus time-to-pressure chart for at the edge of the unmachined cured, it is hard and brittle DS-7000 series adhesive is surface of the spigot. Excess when checked with a knife. included in the instructions adhesive in this area forms a When the bead is not hard after packed with each adhesive kit. good bead at the edge of the exposure to the recommended bell but will not hinder joint temperature and time cycle, DS-8000 series adhesive must make-up. the adhesive was not mixed be heat cured using electric 2. Cocked joint properly. In some cases, the heating collars or Smith Heat surface layer of the bead will be Packs. If a joint is cocked or mis- white and may actually be Although not all-inclusive, the aligned, there will usually be a tacky and soft on the surface. conditions mentioned above are large gap between the bell and This is caused by water absorp- the most common indications of spigot on one side. The oppo- tion on the surface of the failure to achieve a properly site side will usually have a adhesive bead. Use a knife to assembled joint. smaller gap or no gap. Mis- remove a section of the adhe- alignment is easier to detect if sive bead and check the bot- All damaged or improperly assem- one sights down the line and tom side for the color change bled joints must be replaced. See views the joint from a distance. (i.e. white color). If the entire Section 8. 18