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Primary Piping System Installation INSPECTING FOR POTEN11AL CAUSES OF JOINT FAILURE TES -h I NORtdOMMENDATiONS Joint Backout - When assembling a bell and spigot joint, A 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 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. NOTE: When using heat assist, the pipe may bend if it is under stress while curing. In this case it is extremely difficult to determine if the pipe is bent because of heating or if it is a cocked joint. Avoid making up pipe and fitting joints when pipe is under stress. 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 and brittle 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. CAUTM: The adhesive bead will cure faster than the adhesive in the joint. It is important that the joint not be pressurized until it has been subjected to the proper time -temperature cure cycle. A temperature vs. time -to - pressure chart is included in the instructions packed with each adhesive kit. Weather Damage - If ajoint has been exposed to sunlight for a long period of time and the machined area has turned from white in color to yellow or brown and was bonded without a proper repair, the joint may be suspect and could leak or even separate. 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 on pages 14-15. W.0 VMTLI zJ zlJ k' I CAK*i6l !I i zl1*1 M*1 As in any system where pressure is employed, adequate safety precautions should be exercised. EXERCISE DUE CARE IN INSTALLING AND TESTING THE PIPING SYSTEM. In buried applications, it is suggested that long pipe runs be partially backfilled at various points to secure them in place. All joints and connections should be left exposed for inspection. FIBER GLASS SYSTEMS RECOMMENDS THAT YOU DO NOT TEST ANY INSTALLATION WITH AIR OR GAS BECAUSE OF THE SAFETY HAZARDS CREATED. The light weight, flexibility, and elasticity of fiberglass pipe creates different conditions than are present with steel pipe. If a failure should occur while testing fiberglass pipe with air or gas, the system would be subject to considerable whipping and other shock4nduced conditions due to the sudden release of stored energy. The violent release can cause severe personal injury or death to personnel in the area and can also cause property damage to the pipe or other property. If a line is tested with air or gas, Fiber Glass Systems will not be responsible for any resulting injury to personnel or damage to property, including the pipe. If there is no alternative to testing with air or gas, FGS will recommend test procedures and precautions to minimize possible hazards but will not bear responsibility for damage or injury under any circumstances. Such testing is done entirely at the risk of those involved. Test Procedures - Installed FGS Smith Fibercast pipe systems should be tested priorto use to assure soundness of all joints and connections. In testing, sudden pressure surges or "water hammer" must be avoided, as in some instances surge or hammer can produce pressures of several times the rating of the pipe and fittings. Locate pressure gauge in close pmximityto the pressurizing equipment, not directly on the piping system. Pressure gauge with the test pressure at mid scale is recommended. UK