Extreme Mooring Analysis of Turret Moored LNG-FSRU

Abstract

which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.In this study, hydrodynamic and mooring analysis for LNG FSRU moored by an internal turret with 9 mooring lines are numerically performed using commercial softwares, Hydrostar and Ariane. Met-ocean combinations for screening method are taken from wave governed condition(BV Rule Note NR 493) with relative heading between wave and wind between -45° and +45° and relative heading between wind and current between -30° and +30°. Extreme mooring analysis and sensitivity analysis are performed for intact and damaged (=one line missing) conditions and the parameters for sensitivity analysis are wave peak period, peak enhancement factor and line pretension. In the viewpoint of the design tension in mooring line, chain diameter is designed to satisfy safety factor for each conditions. As the chain diameter is increased from 152mm to 171mm, the designtension is reduced while the minimum breaking load is increased.

Methodology of Uniform Filling Control for Vacuum Casting

“…Now in the casting stage ,the VC equipment is constant pressure filling, when a regular shape, in filling direction on the cross-sectional area of the same parts can ensure uniform filling process, filling speed, and more products is irregular in shape, cross sectional area of the filling direction is changeable, resulting in the filling process of the filling speed. Therefore, according to the geometric characteristics of different products proposed a control strategy, obtain for the optimal pressure control method [12][13], so as to ensure the pouring process of uniform filling. In order to effectively solve the problem of the quality of the filling speed in vacuum filling process, it can provide a feasible method to solve the problem.…”