Rock Products

MAR 2013

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LOADING HAULING ��� Engine technology and fuel efficiency go hand in hand. ��� While the on���road use of SCR technology has led to a growing infrastructure of easily obtained DEF, the off���road infrastructure is still evolving. The fluid can be obtained from a number of locations throughout North America (see sidebar), and there are a variety of storage options available for off��� road use. Canisters in sizes up to 4.8 gal. (18 L) can be obtained for emergency use, but Emmett recommends buying and storing DEF in bulk for off���road fleets. ���Fifty���five gal. (210 L) barrels are available for small fleets of up to five machines,��� said Emmett. ���Intermedi��� ate operators can get 265 gal. (1,000 L) con��� tainers for fleets from 5 to 15 machines, while larger fleets will realize the most ben��� efit from high���capacity bulk containers from 400 to 1,320 gal. (1,500 to 5,000 L).��� DEF storage life is temperature dependent. According to ISO Specification 22241���3, storage temperatures of less than 50 F (10 C) give DEF a minimum 36���month shelf life, while storing in temperatures between 87 to 95 F (30 to 35 C) drops the shelf life to a minimum of six months. Pricing for DEF, as with other items, de��� pends on the quantities in which it is pur��� chased. It can cost more than diesel fuel when purchasing it in 1 gal. (3.8 L) contain��� ers; However, when purchased in bulk, DEF can be as low as 60 percent of the cost of diesel fuel. SCR engines use DEF very efficiently, so the costs are reasonable. ���DEF consumption has shown to be less than 10 percent of fuel consumption,��� added Emmett. ���Tests have shown the Tier 4i (Stage IIIB) engines now powering Terex trucks are more fuel effi��� cient than the previous Tier 3 (Stage IIIA) engines, which more than offsets the cost of DEF.��� The 13.7 gal. (52 L) DEF tank on a Terex articulated truck requires filling every other fuel tank fill���up. SCR or EGR, the choice is yours. However, those closest to the emissions control tech��� nology that is here to stay see the best use of the technology being application depend��� ent. ���There are advantages and disadvan��� tages with both technologies, but for dump truck applications, SCR is the preferred technology,��� concluded Sundell. Rick Zettler is president of Z-COMM, a Cedar Rapids, Iowa-based marketing company. Where to find DEF is readily available throughout North America, and distribution is expanding. It can be purchased in a variety of quantities to meet every need. The U.S. Department of Energy maintains a database of DEF distribution locations, accessed 34 ROCKproducts ��� MARCH 2013 online at www.afdc.energy.gov/afdc/locator/def. Alternatively Terex Construction Americas distributors sell DEF as wholesalers, based on arrangements prearranged by Scania and Terex. www.rockproducts.com

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