National Supply Company of Houston, a Division of Armco, has introduced a new line of light-duty hydraulic pedestal cranes, with three compact models offering load capacities to 45,000 pounds and booms to 100 feet. They are designed for platform, drilling, or dockside operations that need dependable lift within space or weight limitations.
Many major North Sea proven features on National's larger cranes are on these light-duty models.
National cranes hold a proven performance and safety record and meet or exceed the requirements of API, ABS, USCG, Lloyd's Register, and Norwegian DnV.
National hydraulic pedestal cranes are designed to be space and weight savers, with overall compactness, minimum tail swing and comparative lightweight.
Space and weight are two very important factors in offshore operations where every square foot and pound can directly affect capital investment and operating costs.
For heavy-duty operations of rugged environments, National Supply offers four North Sea-proven models with standard boom lengths to 140 feet and maximum load capacity to 180,000 pounds. Crane models include the OS-105, OS-215, OS-435, and the new OS-435 Heavy-Duty.
For lighter duty offshore operations, National now offers a completely new line of small cranes. The OS-45, OS-35 and OS-25 give boom lengths to 100 feet and maximum load capacities to 68,000 pounds. These models are designed specially for the light-to-medium lifting requirements of many production platforms, small jackups or service rigs.
Heavy- or light-duty National cranes are versatile and adaptable to most dockside or other marine functions.
National offers a unique hydraulic power system. For the variety of offshore lifting requirements, separate motors are incorporated for the boom hoist, main hoist, fast line hoist and swing systems, adding to overall crane reliability and performance. Unlike most systems, maximum system pressure is not constantly maintained; rather, pressure varies to satisfy load requirements. The result is better lift efficiency, longer service life.
A console, designed for easy operations, allows each crane function and its speed to be easily controlled by the operator. Separate hydrostatic circuits mean functions are completely independent of each other and can be individually or simultaneously controlled with no loss of speed, power or lift.
National cranes are designed for safety with forged alloy steel swing bearing and matching adapter flange. Ball races are hardened and ground with gear teeth designed as an integral part of the outer race.
The entire hydraulic system plus major power and control components are modularized for fast inspection and easy replacement or servicing when necessary. Major components are weather protected.
On large National models, pneumatically actuated controls provide better dependability and less maintenance.
Both main and fast line hoists have two-stage planetary reduction systems that are completely enclosed. Gears and bearings are lubricated during drum rotation. Power controlled load lowering is standard.
The boom hoist has a two-stage planetary reduction system within the drum, automatically operated lock pawl and power-controlled load lowering.
Swing is powered by a reversible motor-drive through a multi-stage gear reduction system with anti-friction bearings and oil-tight case. Gears and bearings have force feed lubrication. The swing brake is mounted on the gear reducer input shaft.
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