Study On Setting Alarm Parameters Reasonably In Storage And Transportation System

Oil is an important energy source for economy development in the world.Oil and gas storage and transportation system affects the national economic construction sustainable development strategy and restricts the balanced development of domestic regional economy.In recent years,with the growth of Chinese national economy,the domestic demand for crude oil and refined oil is increasing,the scale of domestic commercial oil depot is expanding and the degree of automation is getting higher and higher.Frequently,in the process of oil and gas storage and transportation,tank overflow causes fire accidents,tank level which is too low leads to damage to the top of the tank,pipeline pressure which is too high causes oil leakage accidents,pipeline pressure which is too low pressure causes crushed accidents.These accidents cause the waste of resources,and then may result in fire accidents which will endanger the people’s lives,property safety,and the bad and irreparable influence of environment.Sett the alarm parameters of the storage and transportation system resonablely can reduce the possibility of the storage and transportation system hazard and reduce the risk.Therefore,it is necessary to study the alarm parameters of the storage and transportation system.Based on the research of alarm parameters at home and abroad,this paper introduces the concept of credible scenarios,and then redefines it.This paper constructs the response time matrix to determine the response time by analyzing the influence factors of response time.Based on the determination of the credible senarios and the response time,the concen levels of the storage tank is redefined.This paper corrections the method of calculating concen levels and gives the concern levels of the vertical storage tank including storage tank height and low alarm threshold.According to the calculation formula of concern levels of vertical storage tank,this paper gives the calculation method of concern levels of horizontal storage tank,and writes concern levels calculation software of vertical and horizontal tank through VBA language.Through the optimization of material accounting in the process of tank transportation,the fixed amount of material accounting is changed into the dynamic accounting,which is one of the instruments for measuring the liquid level in real time.Accounting the level in storage tank between level switch,liquid level transmitter and other instruments with material accounting level,optimize the tank level hazard protection system in the liquid level measurement part and improve the accuracy of liquid level measurement.Analyzing the phenomenon of water hammer in pipeline oil transportation,obtain the trend of pipeline pressure change under credible senarios by simulation and the critical high pressure threshold to determine the high pressure alarm threshold of pipeline.Combining with the fuzzy comprehensive evaluation method and considering the influencing factors of setting alarm priority and the sub-influencing factors of the influencing factors,determine the factors of the influencing factors.The multi-dimensional quantitative alarm priority setting method is determined from the perspective of human factors,property,environment and ect.Through the study of the alarm parameters in the storage and transportation system,determine the calculation method of level alarm threshold in storage tank and high pressure alarm threshold in liquid pipeline and obtain the quantitative setting method of the alarm priority.Reduce the occurrence of the accident in the storage and transportation system and the probability of reducing the risk of the hazard to a certain degree.