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v <br />Piping system Secondary employs full -performance pipe— Many contained fuel handling systems <br />characteristics employ materials in the secondary that fall far short of the primary piping in regards to <br />chemical resistance and mechanical strength. By contrast, Dualoy 3000/L systems <br />employ the same type of high-performance fiberglass -reinforced pipe in the secondary as <br />in the primary. Thus, Dualoy 3000/L containment systems easily withstand both high <br />external loads from backfill and traffic as well as internal pressures as high as 100 psig. <br />Compact containment fittings — Dualoy 3000/L containment fittings are more compact <br />than competitive clam -shell type closure pieces. As a result, crossovers in a Dualoy <br />3000/L system occupy less space, so less excavation is required than with competing <br />rigid -wall containment systems. <br />Precision pipe exterior eliminates scarfing —Dualoy pipe is manufactured in a <br />proprietary continuous winding process that provides an extremely precise, consistent <br />outside diameter. No scarfing of the pipe end is required to achieve a proper fit of the <br />secondary pipe inside closure pieces. Light sanding of the pipe end to remove the surface <br />Only end prep required gloss and obtain a suitable bonding surface is the only end prep required. <br />is the removal byligM Easy containment fitting assembly — Dualoy 3000/L containment fitting clamshells <br />sanding of surface <br />gloss, are supplied in matched pairs. One half of each pair is fitted with pre -inserted propeller <br />nuts, allowing the fitting to be assembled from one side, using the bolts provided. <br />Complete retestability— Dualoy 3000/L containment employs rigid -wall pipe and <br />fittings that maintain their shape during the entire service life of the station. When installed <br />with isolating penetration fittings (see page 4), Dualoy 3000/L containment piping can be <br />repeatedly retested whenever desired. <br />Convenient repair capability — Contained piping systems are occasionally damaged <br />after installation. Damage is generally caused by paving or excavation operations. Dualoy <br />3000/L contained piping systems are designed so that only the damaged stretch need be <br />replaced instead of the entire line. The 2 -inch Dualoy repair coupling is sized so that it can <br />be contained within 4 -inch Dualoy 3000/L containment pipe. <br />Two-inch primary pipe contained within <br />3 -inch containment pipe can be repaired <br />with a UL -listed 2 -inch repair <br />coupling. The containment is restored by <br />replacement of a section of the existing <br />containment pipe with a 4 -inch <br />containment nipple. The 4 -inch <br />replacement nipple is then joined to the <br />existing containment pipe with Dualoy <br />reducing couplings. <br />4 x 3 Inch reducing <br />couplings <br />2 -inch repair coupling <br />0 0 <br />0 0 <br />O O O O <br />---------------- --- <br />0 0 0 0 <br />0 0 <br />0 0 <br />Align wing -nuts parallel to pipe to permit <br />4 -inch pipe 4 -inch pipe to slip over repair coupling <br />