Engineering Simulation for Loadout of a Tension Leg Platform

Abstract

Abstract Accurate prediction of loads on any large offshore structure during loadout and transportation is of utmost importance, not only for the design of the structure but also to predict operational margin and prevent any unwanted damage onto the structure during the process. The design and engineering of Tension Leg Platforms (TLP) are usually carried out in accordance with the API 2T, MODU Codes and applicable company specifications/requirements. These codes provide extensive guidelines on design of TLP with respect to operational loads but specifics of simulation of loadout are not explicitly mentioned. This paper presents a method to estimate the loadout loads on any large offshore structure, in this case a TLP. The loadout operation of TLP usually comprises of lifting of the structure, i.e. the hull with its topsides, to transfer the loads from temporary support blocks onto jacks followed by skidding of the structure through a distance to the quayside and then crossing over the structure from the quayside to the Heavy Transport Vessel (HTV) and finally setting down the structure onto the HTV to transfer the loads from the jacks to the skid shoe guide posts and additional support structures, on HTV. It is the objective of this paper to present an optimized method of grouping the jacking system for safe transfer of loads during the above operation. This paper also talks about simulating and predicting the series of loads on the hull of the TLP during the entire process of loadout, crossover and setting down.