Analysis of movement of the BOP crane under sea weaving conditions



In the paper, mathematical models for dynamic analysis of a BOP crane un-der sea weaving conditions are presented. The BOP crane is a kind of gantry crane. It is installed on drilling platforms and used for transportation of the Blowout Preventor (BOP). The most important features characterising its dynamics are: motion of the crane base caused by sea weaving, clearance in the supporting system (between the support and rails), impacts of the load into guides and a significant weight of the load. In order to investigate dy-namics of the system, its mathematical model taking into consideration all these features has been formulated. Equations of motions have been derived using homogenous transformations. In order to improve numerical effecti-veness of the model, the equations have been transformed to an explicit form. The input in the drive of the travel system has been modelled in two ways: the kinematic input via a spring-damping element and the force input. Exemplary results of numerical calculations are presented.

Download full-text


Available from: Andrzej Maczyński, Dec 23, 2014
  • [Show abstract] [Hide abstract]
    ABSTRACT: In offshore pedestal cranes one may distinguish three components of considerable length: a pedestal, a boom and a frame present in some designs. It is often necessary in dynamical analyses to take into account their flexibility. A convenient and efficient method for modelling them is the rigid finite element method in a modified form. The rigid finite element method allows us to take into account the flexibility of the beam system in selected directions while introducing a relatively small number of additional degrees of freedom to the system. This paper presents a method for modelling the pedestal, the frame and the boom of an offshore column crane, treating each of these components in a slightly different way. A custom approach is applied to the pedestal, using rigid finite elements of variable length. Results of sample numeric computations are included.
    No preview · Article · Sep 2013 · Archive of Mechanical Engineering
  • [Show abstract] [Hide abstract]
    ABSTRACT: BOP (Blow-out preventer)Gantry Crane is a crane which is used to move BOP stack saved in Drilling Platform to BOP trolley. However, such offshore plant equipment has not been developed in Korea but a lot of loyalty has to be paid to overseas companies. Thus, domestic production of it is necessary. In this research, ANSYS was used to apply into interpretation of rolling and pitching due to wave, wind load due to Drillship, and the crane's self-weight and structural interpretation was implemented. Moreover, Simulation X was used for control system design, and sub system was modeled and hydraulic system interpretation was implemented.
    No preview · Article · Dec 2013
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Oil and natural gases have been developed, being the most convenient and high-quality resources for human. Offshore plant means design, production, installation, and operation of drilling equipment for natural energy in the deep ocean. BOP gantry crane is the essential equipment of Drilling System Package for drillship/rig. It is used to move BOP stack in drilling platform using BOP trolley. In this research, CFX analysis was used to consider wind pressure, and structure analysis was used to consider dynamic coefficient, rolling, pitching, and self-weight. As a result of crane analysis, even though it is a weight-lightened model, it is observed that the pressure, deformation, and stress value caused by the wind load are stably maintained above those of the previous model. Therefore, the structure is thought to be safe.
    Preview · Article · Feb 2014 · Advances in Mechanical Engineering