...1. Introduction Interest in the behaviour of piles under cyclic load- ing grew in the 1980s to meet challenges posed by inherently fail-unsafe Tension Leg Platforms (with the first TLP being installed at Hutton in 1984) and heavily loaded deeper water fixed platforms, such as the Cognac jacket set...

... turbidity concentration magnitude disturbance deposition particle organism upstream oil & gas installation 1. Introduction There is frequently a requirement to bury pipelines and cables into seabed sediments to protect them from external threats. A variety of trenching tech- niques are used...

... cyclic response fontainebleau sand stability diagram installation research and development four-year joint industry project cyclic loading diagram offshore technology conference objective solcyp history interface friction cyclically foundation consideration loading london...

...1. Introduction 1.1 Background Very soft offshore sediments within the Gulf of Guinea present sizeable challenges for the design of pipelines and suction caissons that are to be installed into these sediments. Undrained shear strength pro- files of these sediments typically exhibit high values...

... uplift resistance foundation displacement skirt compartment suction subsea system resistance upstream oil & gas uplift capacity installation conf 1. Introduction Shallow skirted foundations are widely used off- shore to support small platforms, seabed protection structures, storage tanks...

... increases in tow forces of 4–6%. 1. Introduction Offshore pipelines may be installed below the seabed using ploughing techniques to ensure protection against human activity, such as fishing and anchoring. Burial also reduces thermal losses when pumping hot product and the associated problems of upheaval...

... london clay imperial college london shaft resistance installation loading block 1 london gasparre platform design upstream oil & gas block 2 resistance effective stress jardine rj richard jardine imperial college london college london displacement pile capacity subsea system...

... in industry include proce- dures proposed by Toolan and Fox (1977), Stevens et al. (1982) and, more recently, Alm and Hamre (2001). Many of these empirical design approaches were developed when the majority of piles installed in the offshore sector had a diameter that was less than 2m. This paper aims...

... Abstract Driven piles are often used for supporting jackets and providing anchors for mooring patterns. In noncarbonate conditions, driveability assessments are routine and generally reliable. However, piles are now more frequently being installed in areas where carbonate seabed conditions...

... Abstract Piles used for oil platform foundation in Bohai Gulf, China, are usually over 100m long and 2m in diameter. Such long piles have to be manufactured in segments before installation because of transformation and hoisting difficulties. The segments of the pile are assembled during...

... or exploration phase. The Site K FPSO mooring, with 5m-diameter suction piles, was installed by Saipem in 2008. For Site U FPSO, be- cause of the risk of penetration refusal of suction piles into medium dense sand units present at shallow depth, driven piles with the same diameter were adopted for this mooring...

... of geometries to allow flexibility during the installation phase. Finite element modelling of each anchor's holding capacity, as well as careful prediction of the required installation under-pressures, allowed the anchor geometries to be grouped in this way. The successful installation of the suction anchors...

... platforms. Deepwater installations are typically moored using vertical, taut leg or semi- taut leg mooring systems. These systems are de- signed to have high angles of inclination with the mudline (up to 90° in the case of vertical mooring systems). Installation costs of conventional anchor- ing systems...

...1. Introduction There are currently no recognised guidelines for conducting site investigations for renewable projects similar to those that are used for the installation of oil and gas related infrastructure. UK Offshore Oil and Gas Industry Association (UKOOA) guidelines are considered out...

... installation, some consolidation may occur, which could lead to a slight increase of the und- rained shear strength. Typical submerged weight and diam- eter for a pipeline are 1.0kN/m (possibly much less if the pipeline is empty) and 0.25m, respectively. For the case of normally consolidated clay (suv = 0.25...

... at a water depth of 305m (see Figure 1 and Hansen et al.1). The platform was installed in 1995 and, in the following two years, 40 wells, 39 gas production wells and one monitoring well were installed. A typical well design is shown in Figure 2. The platform is the North Sea s largest gas producer...

... ABSTRACT The Troll A platform in the Norwegian trench rests on a huge gravity-based structure (GBS) with 36m deep concrete skirts. The GBS was installed by skirt penetration into a seabed of normally consolidated clay in May 1995. A comprehensive structural and environmental monitoring system...

...Proceedings of the 6th International Offshore Site Investigation and Geotechnics Conference: Confronting New Challenges and Sharing Knowledge, 11 13 September 2007, London, UK 293 1. Introduction Installing jack-up platforms at sites where previous instal- lations have left seabed craters can...

... mature; very large piles may now be driven routinely in a wide range of water depths and geotechnical settings. However, the understand- ing of the ground s reaction to driven pile installation and loading has lagged behind the impressive developments made by the offshore construction industry, as design...

... prediction lierstranda effective stress icp prediction low plasticity ngi pile load test london pile capacity upstream oil & gas knowledge management investigation installation pentre plasticity educational setting load test site investigation reevaluation shaft capacity...