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ENVIRONMENTAL HEALTH DEPARTMENT INSPECTING FOR POTENTIAL CAUSES OF JOINT FAILURE Joint Backout - When assembling a bell and spigot joint, a bead of adhesive is normally formed at the edge of the bell. If the joint is not locked up and backs out before the adhesive cures, the bead will no longer be next to the edge of the bell. Cocked Joint - If a joint is cocked or misaligned, there will usually be a large gap between the bell and spigot on one side. The opposite side will usually have a smaller or no gap. Misalignment is easier to detect if one sights down the line and views the joint from a distance. Improperly Cured Joint - If the adhesive bead is soft or flexible, the adhesive is not sufficiently cured. If the bead is cured, it is hard when checked with a knife. When the bead is not hard after exposure to the recommended temperature and time cycle, the adhesive was not mixed properly. Weather Damage - If a joint has been exposed to sunlight for a period of time and the machined area has turned from white in color to yellow or brown and was bonded without a proper rework, the joint may be suspect and could leak or even sepa- rate. Inspect for color change on all machined areas before bonding. Although not all inclusive, the conditions mentioned above are the most common indications of failure to achieve a properly assembled joint. All damaged or improperly assembled joints must be replaced. See Repair Procedures SAFETY PRECAUTIONS NOV FIBER GLASS SYSTEMS SHALL NOT BE LIABLE UN- DER ANY WARRANTY, CONTRACT, OR IN TORT, FOR ANY RESULTING INJURY TO PERSONNEL OR DAMAGE TO EQUIPMENT, PIPE, OR OTHER PERSONAL PROPERTY FOR FAILURE TO FOLLOW THE PROCEDURES AND COMPLY WITH THE PRECAUTIONS SET FORTH. As in any system where pressure is employed, adequate safe ty precautions should be exercised. 30