Marine Case Study
Jib Cranes for Outdoor Fresh Water Environment
INDUSTRY: Marine
APPLICATION: Cranes for Cushman Dam #1 (Washington State)
PRODUCT: (2) 5 Ton Single Girder Jib Cranes with Underhung Hoists
SERVICES: Design, Installation, Quality and Load Testing
THE CHALLENGE
To design two jib cranes that will safely operate in an outdoor freshwater environment. These cranes must be equipped to lift 6’ x 3’ x 4’ tanks of sockeye salmon and water weighing 9000 pounds.
THE SOLUTION
American Crane manufactured two (2) 5 Ton Jib cranes featuring components such as: corrosion-resistant fasteners, corrosion-resistant coatings and stainless steel electrical enclosures (NEMA 4X). All gearing, including the drive motions and the gear rack, was designed with a minimum service factor of 2.0 for heavy-duty service. In addition to the primary hoist-holding brake, these cranes also employ secondary hoist-holding brakes to operate directly on the drum. Both cranes have a sheet metal covering to protect their trolleys as well as remote-controlled hook assemblies that can be opened or closed using the crane’s remote radio controller or pendant station.
THE RESULT
The first of these two (2) jib cranes has a 36 foot hook reach which helps lift each 9000 pound tank out of the Lake Cushman fish collector facility, placing the tank atop Dam #1 onto a battery powered cart. Next the cart moves the tank off of Dam #1 and places it under our second crane, the Cart Hoist Jib Crane, equipped with a 13 foot hook reach. The Cart Hoist Jib Crane then lifts the tank onto a truck that will transport and release the salmon into the North Fork of the Skokomish River.
American Crane & Equipment Corp.
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