After some years of experience in building production platforms in the sea, it has become apparent to production platforms in the sea, it has become apparent to the Offshore Industry that lack of knowledge concerning the weight and centre of gravity of the topside facility has brought very costly problems.
With the pressing need to obviate these problems a new concept in technology has emerged called Weight Control for Offshore Platforms.
This paper, generally, concerns itself with Weight Control as applied to the topside facility, but it should be borne in mind that similar systems are necessary for supporting structures, be they freestanding jackets, or any type of floating early production systems. It must also be noted that the production systems. It must also be noted that the principles that are stated here will have a future principles that are stated here will have a future application, with some adaptation, to suit changing engineering attitudes which have been affected by the knowledge gained in the Offshore Industry, e.g. the modularisation of onshore plants, floating factories, floating chemical plants.
The aim of this paper is firstly, to state the problems that may arise if weight and balance of the problems that may arise if weight and balance of the topside facility is neglected (and therefore demonstrate the need for Weight Control) and secondly, to enumerate the problems that may be encountered in the setting up of a Weight Control system.
PROBLEMS THAT MAY ARISE PROBLEMS THAT MAY ARISE The knowledge of weight and centre of gravity of the topside facility is a necessity for the jacket design criteria. It is also essential, in the individual modules, which make up the topside facility, for the module load-out conditions, and also the selection of the crane barge for emplacement. Further, this knowledge indicates the ability of the Platform to carry additional plant during production, for full exploitation of a field.
Experience has shown that Platform weights always increase, so, if weight and balance knowledge is neglected the result may well be very expensive penalties and even delays to schedule. penalties and even delays to schedule. In an attempt to preempt the problems that may be incurred by overweight a certain platform had a weight philosophy applied where a substantial contingency was added in the early design phase to cover design options, future changes and design progress. Due to a lack of control during the detailed design phase the total weights were still exceeded. phase the total weights were still exceeded.
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