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0 -ring seals in Pr Dualoy 3000/LSCC [cnnlftD Alergic ream vuhen uskV adhesive (cantimedfrom page 1) position between the closure piece and the nut prior to service. The fittings are closed off with end protectors to reduce the amount of exposure to dirt and other contamination during stor- age and handling. A common misconception about elastomeric seals is that the seal material compresses. What occurs is a displacement or deformation of the seal cross-section, rather than an actual compression of the material. The space in which the larger 0 - ring fits is closed only on three sides. This allows the 0 -ring to be displaced radially inward without restriction. This freedom increas- es the tolerance of the joint, enabling it to perform even if some misalignment occurs or some slight variation in dimen- sion exists. Installation Both 0 -rings are compressed lat- erally as the closure piece and the nut are rotated during assembly. This sealing mechanism is not typical for 0 -rings. Most 0 -rings fit in a groove and are deformed into the space of the groove as the part to which they are to seal is moved into position. With the LCX joint design, the face of the closure piece is pushing against the side of the 0 -ring to make the seal. This face is also rotating dur- ing the assembly. While sensitivity to epoxy resin can happen, it is rare and associated with constant exposure. More often, the allergic reaction that occurs when using adhesive may be a reac- tion from using latex gloves. As observed in the health care pro- fessions where latex gloves are used extensively, approximately 10% to 30°x6 of people may develop an aller- This movement is the reason it is critically important that the 0 - ring be well lubricated with moto oil prior to assembly. If any part c that seal becomes dry or does not slide on the face of the closing part, the seal may be stretched and not be properly positioned. Once the assembly is completed, the seal will remain in position fo the life of the pipe line. The sur- face of the face of the closure piece is designed to be at an angle in order to push the 0 -ring radial- ly outward against the surface of the containment fitting. Testing has proven that the seal will remain tight even under condi- tions of a full vacuum in the interstitial space between the pri- mary and containment. When the integrity of the contain- ment system is confirmed during the proof testing, the system will remain tight. Static (pressure remains on system constantly) and cyclic (pressure is applied and released repeatedly) testing has proven the system remains intact. A popular phrase used for fiber- glass pipe is Fit it and forget it." This accurately describes the LCX product line. If you have any additional ques- tions on 0 -rings or Dualoy LCX, contact the Ameron engineering department in Burkburnett, Texas. gic reaction to the latex used in gloves. Try using vinyl or other non -latex gloves to alleviate the problem. Hypo -allergenic gloves are also available. For background information on tl topic, search the internet under latex allergy, then look for gloves.