Civil Engineer in South Africa - Volume 33, Issue 09, 1991
Volume 33, Issue 09, 1991
Source: Civil Engineer in South Africa 33, pp 329 –337 (1991)More Less
The Mossgas FA gas and condensate platform is the first permanent offshore structure to be installed off the South African coast. Although the technology used for this platform was tested in such places as the North Sea, the lack of any field experience in South African waters posed particular problems for the offshore engineers involved. One such problem was that of installing the tubular piles, which are the longest vertical piles ever installed on an offshore platform. This vertical piled concept, which was chosen over an angled or battered system for cost reasons, required the development of a special installation procedure. This paper describes the development and successful implementation of this innovative procedure, with very significant cost savings, for the client Mossgas.
Source: Civil Engineer in South Africa 33, pp 339 –344 (1991)More Less
The topsides structures for an offshore platform, although serving essentially the same purpose as in an onshore process facility, have to be modularized to facilitate onshore fabrication and subsequent movement of the relatively large packages for installation offshore in their final location. The movement of the substructures, the size and weight of each package and the availability of transportation vessels and equipment place demands and constraints on the design that make it different from conventional onshore process plant design.
Source: Civil Engineer in South Africa 33, pp 349 –356 (1991)More Less
The two export pipelines transporting the products from the shoreplatform to the onshore refinery some 94 km away are required to operate in a variety of environmental conditions, ranging from severe offshore to moderate overland conditions. The paper highlights some of the design and installation methods employed to resolve the potential problem areas.
Source: Civil Engineer in South Africa 33, pp 357 –361 (1991)More Less
The construction of the Mossgas FA jacket heralds a new era in the technological development of the steel fabrication industry in this country. Never before has a structure of this magnitude and complexity been fabricated and transported on South African soil, and the success of this project bears testimony to the co-operation of all the parties involved. This paper provides an insight into some of the unique challenges tackled during the fabrication of the jacket, from component fabrication, through to erection and final load-out of the 14 500 t structure onto the barge at Saldanha Bay.