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Piping system Secondary employs full -performance pipe —Many contained fuel handling systems characteristics employ materials in the secondary that fall far short of the primary piping in regards to chemical resistance and mechanical strength. By contrast, Dualoy 3000/L systems empioythesame type of high-performance; fiL"U-rglass-reinfored pipe In ihesecondary as in the primary. Thus, Dualoy 3000/L containment systems easily withstand both high external loads from bacidill and traffic as well as internal pressures as high as 100 psig. Compact containment fittings — Dualoy 3000/L containment fittings are more compact than competitive clam -shell type closure pieces. Asa result, crossovers in a Dualoy 3000/L system occupy less space, so less excavation is required than with competing rigid -wall containment systems. Only end prep required istheremovalbylight sanding of surface gloss. The and section of a run of containment pipe is placed inside the centersectlon, providing easy access to the primaryJointatone endof the run. Two-inch primary pipe contained within 3 -inch or3r/cinch containment pipe can be repaired with a UL -listed 2 -inch repair coupling. The containment Is restored by replacement of a section of the existing con tainmen t pipe with a 4 -inch conta;nmentnipple. The 4 -inch replacement nipple is then joined to the existing containment pipe with Dualoy reducing couplings. precision pipe exterior eliminates scarfing — Dualoy pipe is manufactured in a proprietary continuous winding process that provides an extremely precise, consistent outside diameter. No scarfing of the pipe end is required to achieve a properfit of the secondary pipe inside closure pieces. Light sanding of the pipe end to remove the surface gloss and obtain a suitable bonding surface is the only end prep required. Easy accessibility to primary fittings— Dualoy systems provide convenient access to primary fittings during bonding, testing and inspection by using lengths of containment pipe of different diameters and appropriate reducing couplings. Inmost layouts the Assam F,iii primary can be contained by three pieces of secondary pipe as shown above. The 3 -Inch lengths at the ends of the run are one size larger than the primary line; the middle piece is 31h -inch containment pipe. The 3 -inch containment sections slip readily inside the 31h -Inch section. By manipulating the sections, ready access to the primary fittings can be achieved during installation and testing. Complete retestability— Dualoy 3000/1 -containment employs rigid -wall pipe and fittings that maintain their shape during the entire service Irfe of the station. When installed with isolating penetration fittings (seepage 4), Dualoy 3000/L containment piping can be repeatedly retested whenever desired. Rapid containment fitting assembly with the Ameron Rivetool — Owing to the extremely precise outside diameter control of Dualoy 3000/L containment pipe and the ample thickness of Ameron containment fittings, Dualoy 3000/L containment systems can be assembled with rivets ratherthan cumbersome wing -nuts or conventional bolts. The easy-to-use pneumaticAmeron Rivetool provides identical tension on every rivet. Riveted closure is fou r to five ti mes faster than closure with bolts. Convenient repair capability— Contained piping systems are occasionally damaged after installation. Damage is generally caused by paving or excavation operations. Dualoy 3000/1 -contained piping systems are designed so that only the damaged stretch need be replaced instead of the entire line. The 2 -inch Dualoy repair coupling is sized so that it can be contained within 4 -inch Dualoy 3000/1- containment pipe. 4 x 3 inch reducing couplings - 2 -inch repair coupling Align wing -nuts parallel to pipe to permit 4 -inch pipe — 4 -inch pipe t4 slip over repair coupling