The Study of LNG Leakage Monitoring in Tank

Abstract

—Liquefied Natural Gas (LNG) is a kind of clean energy. Also, many LNG Tank and LNG-powered vessels have been designed and built around the world. However, LNG introduces the potential risk of leakage and explosion accidents. Thus, it is necessary to conduct safety assessment on the layout of typical facilities during the initial design stage. In this paper, we tested with proposed FOC (Fiber Optic Cable) for cryogenic circumstance, and DTS (Distributed temperature Sensing) system. The proposed FOC which is composed by Stainless Steel Tube, Steel, and PE Soft Jacket with polyimide material is found to be efficient for LNG harsh temperature. The proposed LNG tank monitoring system with the proposed FOC can detect the occurrence of the location, temperature, and alarm of LNG tank leakage. It provides linear continuous temperature monitoring in real time along its long distance tank as well as pipeline during loading, offloading and cool down cycles. The purpose of this study is to lead to monitoring of LNG leakage by inducing a gradual temperature change without deformation in the LNG storage tank. In addition, it is checked whether the cryogenic temperature can be detected, and the cables capable of cryogenic monitoring are tested together with the suggested cable damage degree. This study is divided into three major studies. It is a function of detecting the temperature in the tank at cryogenic temperature, maintaining the temperature change gradually to prevent the LNG tank from being deformed when LNG is inserted in the tank, and detecting the rigidity of the cable. The data were analyzed by testing the data with average temperature, time to reach temperature and loss of cable in terms of cable stiffness. Corresponding monitoring taken on time will reduce the disaster degree of accidents to the least extent