... Walkel, John WIlliams, and Chunsheng Hu Wlmpey Offshore London, U K Abstract The STAb111sed PLAtform (STAPLA) 1S a var1able draught sem1-submers1ble vessel Wh1Ch 1S capable of support1ng both dr1111ng (up to 1000m of water depth) and product10n. The vessel 1S able to change draught from 50m to 10m...

... reserves. In order to obtain a longer produc1ng 11fe for these f1elds d1fferent means of enhanced 011 recovery have to be developed and tested out. Extended employment of the platforms w1th the1r process equ1pment and the pipelines may also be obta1ned through the development of smaller fields 1n...

... Myklestad Aker Engmeenng Bergen A/S Bergen, Norway ABSTRACT The following paper, named "SMAC - Stiff Moored Articulated Column" describes a new platform concept developed by Aker Engineering Bergen a.s. The concept is a low cost compliant platform which is suitable for use in deep waters and where the costs...

.... EXAMPLES Where small wellhead platforms are to be used in the vicinity of the larger North Sea production platforms, Statoil has considered very carefully the possibility of installing concrete gravity base structures over predrilled templates. These concrete gravity base platforms are considered...

... volume of water. The non-zero components of the symmetric structural mass matrix for the total platform are: mll = m I m13 = mZg (9) m22 = m m33 = m(r~ + z:) where m is the mass of the platform in air, Zg is the Z coordinate of the center of gravity, and ry is the radius of gyration for pitch. 267 2.3...

... ABSTRACT Behaviour of skirt footings of gravity offshore platforms is simulated by means of large seale laboratory tests. The studies include static loading tests of rigid plate with flat ribbed elements (skirt) and penetration tests of wedge-shaped rib fragments (simulation of platform...

... Olav Olsen a s Lysaker, Norway ABSTRACTS The most exposed area for fatigue loading in an offshore platform is the area where the deck connects with the shafts of the base structure. The fatigue loading of the deck is becoming more and more often the governing factor of the design. A feasability design...

...PloLeedmgs a/the PI! ,t (1990) EUiopean OjffhOie MeLhal1lcs SymposIUm TlOndherm, Nomay, 20-22 August 1990 Copyl/ghl © 1990 by The Intelnatronal Souely a{Ojf,hOle and Palm Eng1l1eels ISBN 0-9626104-4-5 DYNAMIC IDENTIFICATION OF A STEEL JACKET PLATFORM OstlllO SpadaCGtnl and Andrea Vtgnolt Department...

... e HavCl StatOiI Stavanger, Norway BII gel J Natvig Aker Engtneertng Oslo, Norway Abstract The effects of uncertainties in the modelling of ocean waves is considered both with respect to fatigue and pre- dicted extremes. A tension leg platform is adopted as the example structure and the platform...

... diameter deep water structure. INTRODUCTION Many offshore platforms proposed for the deep water appli- cations are characterized by large diameter vertical cylinders piercing the free-surface (examples: Tension Leg Platform, Monotower Platform and Tripod Tower Platform). The mem- ber diameter...

... Engineering Dept, Rensselaer Polytechnic InstItute Troy, New York, USA Damel E NOt mandeau Woodard & Curran, Inc, Consulting Engrs Portland, Maine, USA ABSTRACT The foundation soils of tension leg platforms (TLP), earth dams, and many other major structures are subject to cyclic loading with an initial locked...