Study of Effect of Trawl Gear on Submarine Pipeline in the Persian Gulf

This paper presents a novel strategy based on the finite element method for prediction of fishing gear interference loads on submarine pipelines. Trawl gear is one of the main factors in the failure of the submarine pipelines. In this paper, the influence of trawl gear on submarine pipeline in the ۱۹th South Pars gas field is located in the Persian Gulf which is having ۳۲” diameter is considered. The FE model is performed using OrcaFlex software includes modeling of seabed, pipeline and trawl gear parameters. To modeling soil and reinforced concrete, non-linear parameters are considered and to validating the models, DNV-RP-F۱۱۱ and results of modeling by SAGE Profile software is used. The results indicated that by increasing free span height, pipeline response is increased but by increasing free span length, only lateral displacement has shown considerable increment. Finally, maximum time of meeting design acceptance criteria was determined for the trawl gear.

Keywords:

Submarine pipeline , Pull-over load , Finite Element Model , OrcaFlex