Tandem crane lift plan

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The LTM 1130 used 4-by-6-by-4-foot (1.2 x 2 x 1.2 meter) white oak timber to create four-by-four dunnage pads that were two layers thick.

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When it came to the essential ground stabilization procedure, the cranes were assembled in a well-traveled, gravel lot. The Doris came in at right around 100,000 pounds total.” The radiuses were key components to maintain the industry standard of 75 percent capacity for tandem lifts. “The LTM 1220 was positioned near the stern of the boat with the same theory in mind to pick at 60 feet and set at no more than 60 feet. “We positioned the LTM 1130 by the bow of the Doris to ensure we could maintain a 40-foot (12 meter) radius from picking to setting,” said Mike Lesniak, operations and company manager, American Crane Company.

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This is when the company received the call to relocate the Doris for further refurbishment. During the time in which the Doris was out of the water being repaired, the American Crane team needed to free up the rail for the Mount Washington ship to be inspected. The rail was designed to haul out the massive 750-US ton (680 metric ton) Mount Washington ship that also sails on Lake Winnipesaukee. The first order of business was the inspection and repair work necessary for the vessel. The Doris was out of the water at the time prior to the lift on a maintenance rail that the Winnipesaukee Flagship Corp.

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