Research on Risk Assessment Technology Method of Pressure Equipment at the Design Stage
|School||Lanzhou University of Technology|
|Course||Chemical Process Equipment|
|Keywords||pressure equipment design stage failure probability failure consequence riskevaluation|
Along with the development of chemical process, manufacturing level of all aspects,pressure equipment increasingly incline to is large change, tall parameter, long period, highrisk, damage mode is complex and diversiform, repair and inspection more difficult, the riskof failure is increased. As a result of possible explosion of pressure equipment and leakage ofmedium may lead to secondary hazards, would endanger the personnel and facilitiessurrounding the container. Design is the guarantee of pressure equipment safety is animportant part of the first. Pressure equipment in the design generally consider the strength,stiffness and stability requirements, less consideration of the various risk factors of pressureequipment in the process of whole life and dynamic service environment, but many reasons ofaccident or failure are lack of equipment design and manufacturing method. The current riskanalysis technology of in-service pressure equipment has become more mature,comprehensive consideration of the risk control of pressure vessel in design stage, accordingto the possible failure mode, take protective measures, and security pressure equipment inservice stage is a new design concept.In this paper, through considering working environment of the pressure equipment(pressure, temperature, medium, etc), based on design concept of risk and life (RBD),comprehensive analysis possible failure modes of pressure equipment and harm of damagemechanism to equipment safety and impact on life expectancy in the process of manufactureand use at the design stage, and establish the risk evaluation system of including the contentsof main failure modes and risk control. International long-term on accumulation of failuremode and corresponding standard system can support implementation of the design stage riskassessment work. According to the standards of API calculate failure probability, failureconsequence and risk value, identify high risk condition and position, put forward to preventthe failure of the method and the measure, and control risk in an acceptable level. Take theparameters of a Hydrogenation reactor as an example, calculation and risk assessment,according to the new "Supervision Regulation on Safety Technology for Stationary PressureVessel"3.6rules to generate the risk assessment report of the pressure equipment design stageincludes the content of the major failure mode and risk control.