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Straightpoint Load Cells Integral to Safe Lift of Refinery Modules

Straightpoint Load Cells for Refinery Lift

Straightpoint Load Cells Integral to Safe Lift of Refinery Modules

A dozen wireless Straightpoint (SP) load cells were added to a custom-built lifting frame that utilized 12 pick points to raise a pair of non-identical refinery modules at a major brownfield project at Saint John in New Brunswick, Canada recently.

The 100-tonne capacity Radiolink plus dynamometers were provided by Stoney Creek, Ontario-based Equipment Corps Inc., which delivered the load monitoring solution to Irving Equipment, headquartered in Saint John. The latter also provided the Demag CC2800 crawler crane, equipped with a superlift. The equipment combined to complete a key phase of the oil refinery project, where a new processing unit was being installed.

Once Irving had designed and fabricated the customized lifting frame, based on the refinery’s specifications, it needed a method of monitoring the loads so they could be certain that the forces generated during the lift did not exceed the design criteria; the modules had extremely tight deflection tolerances that had to be adhered to. Further, explained Irving’s Ryan Long, the height of rigging had to be kept to a minimum due to the weight of the lifts and to avoid the need for a larger crane. The frame was designed to pin directly to the hook of the Demag.

Long added: “The module was designed by the time we were introduced to the lift so deciding where the pick points should be located was a challenge. We needed to find a way to safely lift the modules, whilst conforming to the pick points that were available, which turned out to be three rows of four, including a center row, which made traditional frames and spreader beams prohibitive. Both [modules] had identical lifting points but different weights and centers of gravity. Each pick point was directly above a steel supporting column in the module and the structural design limitations of those columns differed.”

Under the frame were a total of 82 55-ton shackles, 14 Crosby 2.75” turnbuckles, and four equalizer plates, in addition to the load cells. Long explained that a turnbuckle is a piece of rigging gear traditionally used in tensioning applications. They are adjustable in length by means of turning a center body around opposing screws. They are most commonly associated with utility pole guy-wires, he added.

Luke Habza, of Equipment Corps, added: “After taking a light pull with the crane, the team was first able to determine if the load ratios were approximately correct on each pick point. After adjustments were made to the turnbuckles based on the real-time readout on the tablet [utilizing SP’s SW-MWLC high-speed wireless data-logging software] the lift director was able to signal the crane to take incrementally larger loads until the module was airborne and the load of each pick point was known with confidence.”

Each module had been transported from a barge by Irving using 36 axle lines of self-propelled modular transporters (SPMT). Equipment Corps then placed them onto supporting stools whilst the site made final preparations. The modules were transported approximately 2.5km on land and barged another 20km prior to being landed on those stools. Irving used a team of six people for the transportation and four people to execute the lift.

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