In order to improve the safety management of urban gas transmission and distribution system, failure mode and effects analysis (FMEA) was used to construct the reliability analysis system of the pipeline network. To solve the problem of subjectivity and uncertainty of the multi-expert decision making, the correlation operator was introduced into the calculation of the risk priority number (RPN). Using FMEA along with weight analysis and expert investigation approach, the FMEA evaluation table was given, including five failure modes, risk priority numbers, failure causes and effects, as well as corrective actions. The results show that correlation operator can directly process the linguistic terms and quantify the priority of the risks.
. [J]. Frontiers in Energy, 2014, 8(4): 443-448.
Su LI,Weiguo ZHOU. Reliability analysis of urban gas transmission and distribution system based on FMEA and correlation operator. Front. Energy, 2014, 8(4): 443-448.
Internal?and external corrosion;A third-party damage;Welding defect;Violation of construction procedure;Material defect
Leaking gas and accumulating gas in part;Causing accidents such as poisoning, fire, explosion, etc. when problems get more serious
Corrosion prevention: adopting?external?corrosion protection?combined with?cathode?protection; reducing corrosive medium in gas;Strengthening the construction of safe operation on the ground
5.50
Pipeline break
A third-party damage;Welding defect;Internal?and external corrosion
Damaging pipeline;Accumulating gas in part;Causing accidents such as poisoning, fire, explosion, etc. when seriously
Increasing?scrutiny on the municipal engineering construction nearby underground gas pipeline?to prevent?damaging gas pipeline;Enhancing the quality management of construction
Poor sealing, forming leak point;Affecting pipeline?access road open and close;Affecting the regulation of pipeline flow
Replacing with valve body of high mechanical strengthAdopting tight and durable sealing elements;Adopting elements with high corrosion resistance to transmission medium
Forming mixed explosive gas in pipeline;Damaging downstream equipment and pipeline
Adopting corrosion prevention on equipment;Trouble shooting all factors of physical damage
4.06
Filter failure
Filter?element damage;Sewage drain blocking
Damaging internal parts of equipment; Affecting the sealing of valve, pressure regulator and safety device;Affecting accuracy of pressure regulator, flowmeter and other instruments
Examine damaged?condition of all elements of filter; replacing elements with good?performance;Periodically?cleaning sewage drain to prevent blocking
3.94
Tab.6
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