ABSTRACT:

Liquefied natural gas has the unique distinction of being the only flammable or hazardous material. Inspection effectiveness may be introduced into the probability of failure calculation by using Bayesian analysis or more directly by modifying the model for the independent variables, the distribution function and parameters, such as mean and coefficient of variation, changed based on the NDE method and coverage used during an inspection. Available failure data from the LNG industry are often statistically unreliable. Therefore, we need to improve more accurate information data. NDE reliability matrix is to apply optimization method of the NDE method. Environment parameters consist of inspector qualification and experience, test condition and inspection reliability parameters are composed of the inspection method and process method, such as UT, ET, RT and s/n ratio, signal processing method, etc. Finally, this paper purposes that the Reliability matrix is a powerful tool for risk assessment of not only the LNG industry but also in other industry.

INTRODUCTION

Liquefied natural gas is simply a convenient form of natural gas, a cryogenic liquid condensed in volume to make storage economically feasible. LNG is made at a liquefaction plant is restored to a gas at a regasification plant. In a liquefaction plant, there are several steps. The main steps, starting at the natural gas feed, include CO2 removal, dehydration and mercury removal, initial chilling, liquefaction, nitrogen rejection, finally, product LNG storage. LNG is a liquid mixture of light hydrocarbons. The main component is methane C1. And there have a other minority components such as nitrogen N2, ethane C2, propane C3, and traces of i-butane iC4, nbutane nC4, i-pentane iC5, n-pentane nC5(Mario and Rafael, 2010). The largest amount of LNG imported in 2005 was 58.6million tons to Japan, or 30% of the world trade in LNG.

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