..., a test series, consisting of 3 uniplanar and 9 multiplanar X-joints in circular hollow sections, have been carried out for determination of the initial stiffness, the ultimate static load and the deformation capacity. The objective of this study is to investigate the influence of loaded and unloaded out...

... motion response regular wave aqwanaut amplitude wave frequency well control buoy stiffness annular pressure drilling controls and umbilicals hull EXPERIENCE OF SINGLE TETHER BUOY DYNAMICS M Blooklng Cameron Atkll1s Technology Limited, Epsom E R leffelYs Conoco (UK) Limited London, U K...

...] When moving Into deeper water, the relative Importance of the dynamic mooring line tension Increases The magnitude of the dynamic hne tension IS dependent upon several parameters Elastic, axial stiffness, line pretension and line weight are key parameters In assessing the dynamic load effect Advanced...

... imperfection height offshore pipeline midstream oil & gas procedure stiffness diameter download curvature equivalent stress stress-strain curve Ploceedmgs of Ihe FII sl ( /990) European OffshOi e Mechamcs Sympov/Um TI ondhelm, NO! way, 20-22 August /990 ULTIMATE STRENGTH OF PIPELINES D M...

... for oil production in deep waters. The vertical tethers or tendons which connect the platform to the seabed are kept in tension by the excess buoyancy of the platform. The large axial stiffness of the tendons results in natural frequencies for the heave, pitch, and roll motions well above the exciting...

... by stretching along its tangential direction. It is therefore evident that, for sufficiently high frequencies, the nonlinear dynamic response of an elastic cable in deep water is dominated by its elastic stiffness, the reduction of which would improve the dynamic performance of the line_ This can be achieved...

... of the pipe Wellstream has developed a family of simple and accurate methods for calculating static failure and stiffness properties of flexible pipes. Degradation of risers may result from wear of the tensile armor wires as a result of slip during flexure. Wellstream has derived a formula for the magnitude...

... of the anchor damage to failure statistics and stressing its importance for an assessment of safety of pipelines. ship mechanics anchor stiffness operation fluke frequency anchor damage offshore pipeline scenario north sea protection cover deflection interaction deformation procedure...

..., marine growth and axial pile group stiffness. A parametric structural dynamic identification is achieved by the modal parameter technique, comparing the theoretical and experimental response of the platform. I. INTRODUCTION This paper is concerned with a dynamic study of the Vega steel jacket platform...

... response oscillation simulation sectional model stiffness submarine pipeline pipe-soil interaction constraint displacement upstream oil & gas string model interaction PlOceedmgs of the Fllst (1990) European OffshOle Meehan/(s Symposium TlOndhelm. Norway. 20-22 August 1990 Copyl/gh/ © 1990...

... conduit seal conduit wall friction stiffness radial bearing coefficient tether system upstream oil & gas water pressure contact area test rig tether conduit bearing element elastomer resistance strength rotation stiffness cylinder flake epoxy system Ploceedmgs of the FII st ( 1990...

.... The horizontal stiffness of a jack-up platform is typically an order of magnitude less than the stiffness of a corresponding jacket structure. Thus the dynamic effects become significant as the fundamental period of a jack-up may typically be m the range 4–8 seconds where also the wave energy is becoming...