MOVING HEAVY LOADS ON A GAS OR FLUID SUSPENSION SYSTEM

After giving some general information on the principles and practice of this type of equipment, the Author (of Mackley Ace Ltd) describes some constructional and operational features of Mackace hover platforms own power but rely on winches, tractors, or tugs, as appropriate, for movement over the land or water. The platforms, simple in design and operation and smaller than the transporters, are based on a series of pontoons which are essembled on site. They can carry loads of up to 100 tons, and are primarily for small offshore operations such as piling and coring. A special variation of the platform is a hovering 12-in. cutter-suction dredger. The Sea Pearl, described as the world's largest hover transport and designed to overcome congestion in ports, was built to meet specific needs in the construction of the Abu Dhabi gas reliquefaction plant; it carried prefabricated modules from the mainland to an island 110 miles away, where it was able to come ashore at a place convenient to the main plant-assembly site. This craft, with an all-up weight of 760 tons, has a 250-to payload capacity at a hover height of 4 ft; the hull, which measures 180 by 80 ft, has 18 watertight compartments and a complete ballast system. The two Yukon Princess hover ferries, 129 ft long by 80 ft wide, were built in Alaska in town weeks to carry loads over the River Yukon during the construction of the Trans Alaskan pipeline; the two 1,500-hp craft, each capable of a 160-ton payload, were winched over the river (which was either frozen or fast-flowing, according to season) to provide a round-the-clock ferry service at a rate of 100,000 tons of cargo a month. Although the lack of self-propulsion is a drawback of these platforms and transporters, it enables costly propulsion engines and qualified operating crews to be avoided. However, a compromise solution is expected to be available shortly; this will be a simple self-propelled hover platform with large wheels for use on land and a marine propeller for operating over water. Other development work mentioned includes the movement of dense loads such as concrete caissons or ship-sections on air- or fluid-suspended pallets; this may lead to the movement of loads of up to 6,000 tons in such applications as the constructions, in shipyards, of complete refinery plants ready for transport in sections to the site on sea-going submersible barges. Probably the biggest source of interest at present is the use of hover platforms and transporters for ship to shore operations. The movement of loads of 100,000 tons is also being studied.

  • Corporate Authors:

    Kalerghi Publications

    51 Welbeck Street
    London W1,   England 
  • Authors:
    • Turner, DGW
  • Publication Date: 1977-1

Media Info

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Filing Info

  • Accession Number: 00165397
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Report/Paper Numbers: Analytic
  • Files: TRIS
  • Created Date: Nov 23 1977 12:00AM