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Nigerian Dredging Summit 2011. Pictures of Past Dredging Summits
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IN THE NEWS...
AFRICAN PLANTS AND EQUIPMENT DIGEST New Cat® 621H, 623H and 627H Wheel Tractor-Scrapers For High Productivity And Operator Comfort
H Series Wheel Tractor-Scrapers build on the proven durability and productivity of previous models with use of innovative technology. Sequence Assist and Load Assist automate many of the operator’s most demanding tasks, and when combined with Cat Grade Control, the new systems unburden veteran operators and help less experienced operators reach high productivity levels quickly. With the H Series introduction, Caterpillar is offering the 621 in a push-pull configuration for the first time. The system enables two scrapers to work together when loading, rather than requiring a push tractor. Other scraper models have proven that the push-pull configuration is the low cost solution in many applications. The new H Series machines replace the equivalent G Series machines when commercial production begins in August of this year. Each of the three models will be available with engines that meet US EPA Tier 4 Interim and EU Stage IIIB emissions standards and with engines for use in other regions. The 620H Series Wheel Tractor-Scrapers maintain the G Series configurations. The 621H is a single-engine, open bowl machine; the 623H has an elevating scraper and a single engine; and the open-bowl 627H has twin engines—one on the tractor and one on the scraper—and all wheel drive. Capacities are increased 2 cubic yards (1.5 cubic meters) to 24 cubic yards (18.3 cubic meters) for the 621H and 627H. The new bowl design is easier to load than the G Series bowl and has proven to enhance production. The 623H bowl maintains 23 cubic yards (17.6 cubic meters) capacity, but the elevator is stronger, more powerful and easier to adjust. The result is greater reliability and durability. New engines and drive train controls improve performance
and operator comfort New software ensures integrated performance of the engine and transmission. The 8-speed planetary powershift transmission hardware is the same as the G-Series unit, but new controls and software drive greater performance. The system manages the torque converter and transmission to provide smooth operation, which enhances operator comfort and extends component life. Performance on grades and coming out of the cut is noticeably better through sustaining torque through shift points. On flatter hauls, shift points are optimized for a balance between fuel economy and performance. Complimenting the new power train and higher capacity are wet disc service brakes. The new brakes are similar to Cat off-highway truck brakes and deliver predictable and durable stopping power. The H Series machines also introduce engine compression retarding and the elimination of hydraulic retarding. Engine compression retarding can be modulated within low, medium or high ranges to optimize cycle times. Technology assists operator and reduces rework Load Assist is available on the 621H and 627H models. It builds on Sequence Assist by loading the bowl with the push of a button. As the machine enters the cut, the operator can activate Load Assist so the system takes over control of the cutting edge height, limiting tire spin based on integrated sensors and GPS technology to ensure consistent and full bowl loads. The operator is responsible only for the throttle and steering. Load Assist helps make inexperienced operators productive very quickly. Cat Grade Control is available on all three models and is designed to work seamlessly with Sequence Assist and Load Assist. Using satellite positioning technology, the system ensures cut protection by limiting how deep the scraper will dig. The optional system is available from the factory and fully integrated into the machine. The system also puts the site plan in front of the operator for increased efficiency and elimination of rework. Another benefit of Cat Grade Control is site mapping using the scraper. New cab and operator station—designed for wheel
tractor-scrapers As part of the improved ergonomics, the steering column and pedals align with the right front post of the cab. This puts the operator in a more comfortable position when the seat is turned 30 degrees. A T-handle implement control is designed to fit comfortably in the palm of the hand and is aligned with the seat armrest for comfortable operation. The new wheel tractor-scrapers also feature multi-function hydraulics. The optimized hydraulic system, which uses piston pumps rather than vane pumps, enables the operator to operate the apron, ejector and bowl height control at the same time for faster cycle times. An integrated dash group offers displays for the optional Work Area Vision System (WAVS). Cameras on the machine provide views of the cutting edge, right side and rear. The system enhances safety and provides a new way to see the cutting edge during loading and to see to the rear of the machine when performing push-pull work with another scraper. An optional powered access ladder facilitates getting in and out of the machine. The ladder raises and lowers, tucking up under the cab when not in use. A new cushion hitch configuration also enhances operator
comfort. The 620 Series hitch has two accumulators—one high pressure
and the other lower pressure. The high pressure accumulator softens
the ride when the machine is loaded, and the lower pressure accumulator
optimizes dampening an empty bowl. |
Editorial
Is Alpha Beach another Bar Beach saga in the making? Alpha Beach in the Lekki peninsula is gradually being wiped out as you read these lines. The culprit is the Atlantic Ocean. In the past few weeks, most of the shanties and shacks that used to serve the hospitality industry are gone; their owners left without their businesses. Most importantly that pristine ecosystem has been taken over by the ocean waters and it is now becoming a nightmare to people who have erected palatial mansions on that waterfront. What will they do? Read more...
Other Articles &
Interviews: Capt Adeyemo on River Niger Dredging... Prof P.C. Nwilo on his assessment of NIWA during sabbatical ... Mr Nseyeng Ebong on his 8-year tenure as rector of Maritime Academy of Nigeria Oron... Chief Dumo Lulu Briggs as chairman of Maritime Academy of Nigeria Oron, his vision... Engr Muyiwa Omasebi: The face-off Between NIWA, MMSD and Lagos State Govt. Otunba K Folarin: The Collapse of Nig. shipping lines. P.L. Carrodano: How govt can revive Nig. shipping lines. Sam Epia: The struggles of Nig shipping lines with cargo reservation scheme. Jeff Gibb: Intricacies of the equipment market in Nigeria. Environmental
Quality Monitoring. Role of Surveying in the Dredging Industry G.B Liman: Of Myth, Reality and Resource Control Dredging Law: A judgment on the ownership of a sand dredging site by the Court of Appeal. Dredging
Law: b.
NIWA public notice on Lagos State intervention in inland waterways regulation. |
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NIGERIAN DREDGING SUMMIT REPORTS: Picture Slide Show of 4th Nigerian Dredging Summit 2010
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