Structural response analysis of the hydraulic pneumatic tensioner under its local failure based on a fully coupled TLP-TTR system

Shuai Hao, Yang Yu, Jianxing Yu, Zhiming Yuan, Lixin Xu, Zhenmian Li, Siyuan Cheng, Jingyi Wu

Research output: Contribution to journalArticle

Abstract

The presented work studied the structural response of the hydraulic pneumatic tensioner (HPT) in a TLP-TTR system with failure of the tensioner cylinder. A fully coupled hull-tendon-TTR-tensioner model was established in AQWA to simulate the failure numerically. A specific HPT was modeled by considering 4 cylinders and the real-time stroke of each piston. A set of formulas was proposed to calculate the real-time tension including different components, e.g. Stribeck friction, in the tensioner. A riser array including 6 independent production TTRs and their tensioners was also modeled. The production TTR model was stacked up by different specific riser joints. The hydrodynamic force acting on the hull was obtained by using the 3D potential flow theory. The real-time tensions on different tensioner cylinders were obtained by using an in-house-developed program. Different environmental conditions, including a calm sea, regular waves, and extreme sea states, were considered in the simulations. In the results, the behaviors of different cylinders of the failed tensioner were presented. The results show that when an accidental local failure of the HPT occurs, the tension and stroke responses are still far from the designed-limits to induce a progressive failure.
Original languageEnglish
Article number107645
JournalOcean Engineering
Volume216
Early online date4 Sep 2020
DOIs
Publication statusPublished - 15 Nov 2020

Keywords

  • tensioner failure
  • top tension riser (TTR)
  • fully coupled model
  • hydraulic pneumatic tensioner (HPT)
  • hydrodynamic responses
  • 3D potential flow theory

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