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Mar 24 2013

One Union Square Gets a Lift

On March 16, PSF removed a fluid cooling tower weighing approximately 10 tons (20,000 lbs) from the rooftop of the 38-story One Union Square building. The PSF team, led by General Foreman Cody Hinman, included Wayne Lawson, Chris Rice, Chris Clarke, Ron Marson, Joe Brucker, Peter Berhmann and Shawn Koths.

One third of the 30-year-old unit being carefully lowered to 7thAvenue

Northwest Tower Crane Service was on hand with a fixed derrick crane, anchored in four locations on the rooftop, which lowered the unit, in three sections, 467 feet down the side of the building. The operation required high precision and coordination as the individual units, each weighing more than 6,000 lbs, were lowered in 13-knot winds.

The new mid-section arrives at the roof for placement

The following weekend, a new cooling tower of the same size was hoisted to the rooftop in three sections. The new unit has a 1,400-ton cooling capacity, uses 40% less energy, and is anticipated to provide the client with Seattle City light incentive rebates.

In addition, a structural vibration seismic base and pre-fabricated major piping components were lifted on to the rooftop, for a total of 13 major lifts for the weekend. Each operation went off without a hitch, drawing almost no attention from traffic or passersby. Due to diligent planning, excellent field coordination, and a well-designed rooftop installation, the occupants of One Union Square will be thrilled with their comfort levels, and the client will enjoy significant energy savings.

The new mid-section is lowered into place


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