The Risk Assessment Technology Research Of The Large Spherical Tank

Due to the rapid development of China’s petrochemical industry, especially the wideapplication of liquefied petroleum gas and liquefied natural gas, the spherical tank as acommon storage devices, the number increased dramatically. Spherical costumesmedium is usually flammable, explosive, corrosive or toxic characteristics, so it is aspecial safety equipment, with a high degree of risk. The event of failure will result indeath or serious property damage. Therefore, the spherical tank, especially for largespherical tank risk assessment studies for the effective prevention and control of majoraccidents, as well as in guiding the implementation of the spherical tank inspection, toensure the safe operation of the spherical tank, has a good theoretical significance andapplication value.This article is to analyze the statistics of spherical defects and defect causes,combined with the design, manufacturing, installation, testing and other specifications,summed up the spherical tank failure of various factors and the establishment of anorderly hierarchy. Constructing a spherical tank failure fault tree. Calculated by theminimal cut sets, identify the main factors of the cause of the spherical tank failure,calculation and sorting of structural importance to identify the largest sources of danger,complete the spherical major hazard evaluation, and make recommendations accordingly.By major danger sources evaluation, the possibility of factors are divided into injuryfactors, management factors, technical factors, operational factors, the establishment oflarge spherical tank risk assessment system, and the use of quantitative and qualitativeindicators to establish scoring rules by the fuzzyAnalytic Hierarchy Process fuzzycomprehensive evaluation, risk evaluation of the total score, that is, the likelihood offailure score. Calculation of property damage the area casualties area, and into scores ofcasualties and direct economic losses under the relevant provisions of the boiler andpressure vessel pressure pipe special equipment accident the required score by fuzzy language description of the consequences of intangible losses till the invisibleTheconsequences of the score, whichever is the highest score among the consequences offailure as the final score. Large tank failure possibility score ranges from0to100points,the consequences of failure scores range from0to150points, according to the risk valueis equal to the likelihood of failure and the consequences of failure of the productdefinition, the risk value ranges from0to15,000, according to the British TWI thecompany’s risk-adjusted risk classification matrix to obtain the final risk level tank, andaccording to risk levels to make specific policy recommendations inspection...