Flexible Disc Coupling

6000 hp Synchronous Motor driving a Centrifugal Compressor

Problem: In the past the customer used a hydraulic wrench to tension the coupling nuts. They experienced many problems with this method. It was considered expensive, time consuming and unsafe. Broken lines and broken sockets were a cause of problems, and the threads often galled when removing the nuts. Using the hydraulic wrench required three men and eight hours to torque 32 nuts. It was also difficult to torque the intermediate coupling because of clearance restrictions.

Solution: Using Superbolt® Multi-Jackbolt Tensioners it took two men 2-1/2 hours to install. This allowed the compressor to get back on line much sooner and start producing product. The Superbolt® Tensioners were easy to remove with no thread galling. The tensioners could then be cleaned and reused.

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Old Method: Hydraulic Wrenching, 3 men / 24 man hours

New Method: Superbolt® Tensioners, 2 men / 5 man hours

Product: Superbolt® CY-162-12/w
Preload: 168,600 lbs
Jackbolt Torque: 65 ft•lbs

*Superbolt® tensioners have also been used on 11,000 hp applications

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