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Modernizing the Welland Canal
Ready for the 21st Century
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An international team of Rexroth employees worked on the modernisation of the Welland Canal. Specialists from the Applications Center for Hydaulic Steel Construction in Lohr am Main (Germany) took on the task of designing the hydraulic systems. The actual implementation of the detailed design, construction of the power units and the complete control technology was overseen by Rexroth in Canada. The special cylinders were manufactured by Rexroth in the Netherlands.
The Rexroth solution permits motion and control without the need for further mechanical elements. The new hydraulic system is monitored by means of a PLC control system. This enables the operators to continuously observe all the main parameters, and to finely tune these with regard to positioning accuracy, speed and power. The 4.27m x 4.27m large Taintor Valves as well as the Mitre Gates can be controlled more accurately with the new drives and can extend the navigable period of the seaway during the winter months.
The customized hydraulic units combine a high level of efficiency with reliability. The pumps use an ISO Grade 15 mineral oil and achieve an operating pressure of 207 bar, with a maximum pressure of up to 345 bar. The made-to-measure hydraulic cylinders include a Ceramax II coating, designed specifically for the harsh operating conditions to which hydraulic steel structures are exposed, protecting the cylinders from corrosion, abrasion and many aggressive chemicals. They are thus able to operate in the Canadian climate with its temperatures ranging from -30°C to +38°C.
With the successful completion of the two-year pilot project, the SLSMC is now looking to Rexroth to extend the contract and complete the modernization of the remaining locks. As soon as the thaw sets in, the ships will again be navigating the St. Lawrence Seaway, but this time somewhat more efficiently and reliably through the modernized locks.
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