BAE Systems, San Francisco Ship Repair had a requirement for a replacement crane on their largest drydock; Adams Machinery was chosen as the supply source.
The design and engineering phase concentrated on the specific requirements and operating characteristics of the wingwall mounted crane. Discussions with the customer regarding the needed capacity, boom reach, power supply, travel mechanism, safety standards, and other elements of the design defined the crane engineering along with additional options.
The crane was built incorporating some existing components from an American model RH-3520 portal crane. The carbody (slew gear & rail ring circle), travel trucks, upper machinery frame, swing gearbox, boom and hoist/winch packages were rebuilt to “like new” condition. A new operators cabin was fabricated and fully equipped with new controls. All new electrical components were installed including variable frequency drives on all crane and travel functions. New fabrications also included the machinery room enclosure, catwalks, electrical room enclosure, counterweight package and portal & tower support frame. The crane was built to ANSI standards and full compliance to prevailing welding standards.
Testing and commissioning were completed by an accredited crane inspection and certification vendor. Maintenance and operators manuals were supplied to the customer as well as operator training. The crane was certified to Cal-OSHA qualification.
Based on the customers specific needs and tail swing restrictions, the customer needed to be able to swing the rear of the machine within its own footprint while also increasing capacity. The final design resulted in 14′ of tail swing being removed and additional reach and capacity for the customer.
Variable Frequency Drives on all functions, coupled with Infinitely Variable Joystick control means that the operator control of the machine can be measured in fractions of an inch. Programmable speed control & Simultaneous Multi-Function capabilities make this machine as Operator friendly as it is Efficient.
An Integrated Load Monitoring System with programmable speed, angle and capacity, coupled with Mechanical stops, fail-safes and lockouts means that this machine meets and exceeds safety standards.
LONG TERM SERVICABILITY
A marine grade coating system, sealed double-row bearings, non-rotational wire rope, climate all-weather galvanized electrical boxes and sealed motors and gearbox assemblies, are just some of the design elements that keep the cost of ownership and downtime low for our cranes.