Overload testing completed for new Manitowoc 31000
By D.Ann Shiffler26 July 2010
Manitowoc Cranes has completed the required overload tests of its Manitowoc 31000. During testing the machine lifted up to 5.5 million pounds (2.5 million kg) of test weight.
The crane was designed with a 2,535 ton (2,300 metric ton) rated capacity. All new crane designs must undergo an overload test to confirm the engineered capacity of the crane, according to Manitowoc.
Larry Weyers, senior vice president of the Americas region, said the test went as expected, and engineers were pleased with how the crane performed under load.
"The lift went very smoothly, and our unique Variable Position Counterweight worked perfectly," he said. "
The Manitowoc 31000 was fitted with over 600 strain gauges that measure the tension or compression of the steel components of the crane while lifting.
Data from the test will be analyzed to determine if any design changes are required in the production units of the Manitowoc 31000, according to Kevin Blaney, manager of product marketing for crawler cranes.
"We'll check the stresses in the structure to verify the preliminary capacities," he said. "Then we will correct them up or down or modify structural components to assure that actual stresses are within accepted limits."
Boom lengths on the 31000 will range from 180 feet to 344 feet. Various fixed and luffing jib setups will also be available.