Literature is now available describing a "fixed-mounted" version of its unique opposed-pinion jacking system for offshore platforms manufactured by National Supply Company. Attached by welding directly to the hull, the fixed version allows the National jacking system to be used on a greater variety of platform designs, according to the Houston-based company.
Fixed mounting enables a lighter leg support structure by transmitting jacking forces directly to the hull, noted National Supply. The new fixed mounting method was developed in cooperation with naval architects and shipyards and has been accepted by a number of yards both in the U.S. and overseas.
The National jacking system has been available until now in a "floating version" that uses shock pads to transmit loads between jack unit and hull.
Each version has advantages and design trade-offs, said the manufacturer. The "floating" version provides greater flexibility and fabrication ease, while the fixed version is simpler, lighter and more economical.
Availability of both provides greater options in meeting various performance criteria for everything from compact platforms for relatively shallow depths and moderate sea conditions to very large platforms for severe operating environments.
National Supply offers one of the most complete lines of offshore drilling platform equipment, including drilling machinery, derricks, wellheads, mooring equipment and offshore pedestal cranes.
For complete literature on National jacking systems, Write 59 on Reader Service Card