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4. <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 prig. <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 /> s 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 by light 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 ret bility—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 /> ch Two-inch primary pipe contained within a x 3coupliings ng <br /> 3-inch containment pipe can be repaired <br /> with a UL-listed 24nch repair 2-inch repair coupling <br /> coupling.The containment is restored by o 0 0 <br /> 0 <br /> replacement of 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. 0 0 0 <br /> Align wing-nuts parallel to pipe to permit <br /> 4-inch pipe 4-inch pipe to slip over repair coupling <br /> 2 <br />