Response of submarine pipelines to impacts from dropped objects: Bed flexibility effects

Buckling behaviour analysis of a buried steel pipeline in rock stratum impacted by a rockfall

“…The yield stress is 448.5 MPa [7], the young's modulus of the steel is 206 GPa, Poisson's ratio is 0.3, and the density is 7800 kg/m 3 . Mechanical behaviours of the stratum and rock material are represented by an elastic-perfectly plastic Mohr-Coulomb constitutive model [8]. The backfill soil's cohesion is 15 kPa, the friction angle is 15°, the elastic modulus is 20 MPa, the density is 1840 kg/m 3 , and Poisson's ratio is 0.3.…”

Wave Loads Computation for Offshore Floating Hose Based on Partially Immersed Cylinder Model of Improved Morison Formula

“…Parameters of level 4 waves are used to calculate the velocity and acceleration of wave partials in formula (16) and formula (17). Thus, the wave load could be calculated by submitting those results along with the height h and the projected area 1 S to formula (1) and (10). Extreme values of wave loads through the use of Stokes theory are listed in Table 6.…”

“…At present, offshore isolated pile [6][7][8] and submarine oil pipeline [9][10][11] are main subjects of wave forces effects on small-size offshore structures. Researches aimed at the calculation of wave load of floating hose are relatively rare and Morison formula [12][13][14] which includes the inertia term (depending on wave acceleration) and the drag term (depending on square velocity) directly brings about inaccuracy.…”

Risk-based integrity model for offshore pipelines subjected to impact loads from falling objects

“…4 This mainly refers to pipelines suffering impact loads from falling objects as a result of platform operations or ship anchoring. [5][6][7] Therefore, pipeline safety from impact loads plays an important role in offshore oil and gas exploitation.…”