Abstract: Pressure pipeline valves are important components of pressure pipelines and belong to pressure-bearing special equipment. The type test of the pressure pipeline valve is a verification of the compliance of the safety performance of the pressure pipeline valve produced by the manufacturing enterprise. Using WBS-RBS structure method to effectively identify the hazard sources of occupational health and safety in the type test process is beneficial to adopt corresponding control measures to ensure the personal safety of inspectors to reduce the occurrence of safety production accidents.
Key words: WBS-RBS; pressure pipeline valve; type test; risk identification CLC number: TH134 Document code: A Article ID:1003-5168(2018)22-0035-03
Risk Source Identification of Pressure Piping Valve
Type Test based on WBS-RBS
LIU Haoran1,2 CUI Weidong1,2 WANG Yan1 WANG Jiabang1 XIAO Teng1,2
(1.Henan Province Boiler and Pressure Vessel Safety Inspection Institute, Zhengzhou Henan 450016; 2.National Pressure Valve Product Quality Supervision and Inspection Center, Zhengzhou Henan 450041)
The type of the pressure piping valves is a verification of the safety performance of pressure pipe valves produced by manufacturing enterprises. The WBS- RBS structure method is used to identify the dangerous sources that endanger the personnel's occupational health and safety in the process of type test. It is beneficial to take the corresponding control measures to ensure the safety of the inspectors, and to reduce the occurrence of safety accidents .
Keywords: WBS-RBS;pressure pipe valves;type test;risk identification
The pressure type valve type test is to carry out product inspection according to the requirements of the type test qualification tester and the relevant product standards, and to design and manufacture the pressure pipeline valve in the fixed inspection place meeting the inspection conditions. Conduct a comprehensive technical review, inspection and testing, and conduct destructive tests if necessary to determine whether the product meets safety requirements and is used to verify the ability of the manufacturing company to produce products that meet safety performance. After the inspection is completed, issue a type test report to the applicant [1] ].
Pressure pipeline valve type test system has many types of dangerous sources, which are intricate and complicated, and are judged by visual experience method, which is prone to omission. In order to identify risks more comprehensively, intuitively and logically, this paper introduces the WBS-RBS method into the pressure pipeline valve type test hazard identification [2,3].
1 Pressure pipe valve type test work breakdown structure Work Breakdown Structure (WBS), that is, using the system principle, the project is decomposed into a suitable, controllable work unit, and finally the boundaries of its unit content. Multiple work units together form one or more column vectors of the hazard identification system. There are usually four types of decomposition: according to the implementation process, according to the plane, spatial position, according to the functional surface, according to the element [3]. Considering the operation process, starting from the implementation process, this study decomposes the structure of the pressure pipeline valve type test work system into 14 units of the first stage as shown in Figure 1 [4].
2 Pressure Pipeline Type Test The Risk Breakdown Structure (RBS) is to break down the risk that may occur according to the actual situation, and the hazard source is identified until the lowest working unit. Multiple risk decomposition levels together form one or more row vectors of the hazard identification system [3]. By summarizing historical experience, the causes of accidents that may lead to pressure pipeline valve type test are divided into five aspects: human factors, physical factors, process technology factors, operating environment factors, and management factors [5, 6]. According to the classification of the cause of the accident, the valve type test danger source is decomposed into 5 primary and secondary 34 units, as shown in Table 1.
3 Pressure pipe valve type test WBS-RBS hazard source identification matrix crosses the WBS and risk decomposition structure RBS, which is the WBS-RBS hazard source identification matrix. The results are shown in Figure 2. Among them, the row of the matrix represents the working unit of the lowest decomposition of the work breakdown structure, and the column of the matrix represents the lowest risk of the decomposition structure of the dangerous source [3].
4 Assessment and classification management of hazard sources Hazard source assessment is an analysis of the probability of occurrence and the severity of the risk after the occurrence, based on which the risk is judged to be acceptable. The degree of risk (risk) is usually expressed as a function of the probability of an accident and the severity of the consequences: R = f(P, S) [7]. Where P is the probability of an accident, S is the severity of the consequences of the accident, and R is the risk. The higher the score, the greater the risk. This hazard source assessment uses the R=P×S method to divide the value range of P into 1-5 grades: never occurred, level 1; annual occurrence, level 2; quarterly occurrence, level 3; monthly occurrence, 4 Level, weekly, daily or frequent, level 5. The range of S values ​​is divided into 1-5 levels: no injuries, level 1; mild injuries, level 2; medical treatment, level 3; hospitalization, level 4; casualties, level 5. The R value range is divided into a slight risk (≤ 5), a general (acceptable) risk (5 ~ 9), a significant risk (10 ~ 19), and a particularly significant risk (20 ~ 25). When the risk index R ≥ 10, the risk is unacceptable and precautions must be taken to reduce or eliminate the risk and monitor the source of the hazard.
Through a questionnaire survey of experienced testers and testers [2], the risk source of risk index ≥ 10 was obtained by statistical method, as shown in Table 2.
5 Conclusions This article refers to human unsafe behavior, risks associated with machinery, electrical, facilities, tools, hazards associated with process media, materials, hazards associated with inspection sites, operating environments, and risks associated with technology and management. On the other hand, the WBS-RBS structure method is used to comprehensively analyze the dangerous sources in the pressure pipeline type test process. Based on the risk identification, the R=P×S model is used to obtain the high risk factors in the test process, in order to construct, quantify and evaluate the system risk of the safety risk assessment index system of the pressure pipeline valve type test. The establishment of the accident prevention mechanism lays the foundation.
references:
[1] General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. TSG D 7002—2006 Type Test Rules for Pressure Pipe Components [S]. Beijing: China Standard Press, 2006.
[2] Luo Yun. Special Equipment Risk Management——The Theory, Method and Application of RBS [M]. Beijing: China Quality Inspection Press, 2013.
[3]Liu Haozhu. Research on safety risk of limestone mine gravel processing system based on SVM [D]. Chongqing: Chongqing Institute of Science and Technology, 2015.
[4]Zhou Jiejing. Research on Subway Construction Risk Based on WBS-RBS Structure[J]. Value Engineering, 2009(11): 76-80.
[5] Li Yujun, Wei Hongzhe. Risk Identification and Control in Safety Valve Calibration Process[J]. Chemical Industry Management, 2014(35): 77.
[6] Pang Xiaoli, Huang Qian. Safety Management of Hydraulic and Pneumatic Components Testing Laboratory [J]. Modern Measurement and Laboratory Management, 2015(6): 59-60.
[7] Jing Guoxun, Shi Shiliang. System Security Evaluation and Prediction [M]. Xuzhou: China University of Mining and Technology Press, 2016.
Key words: WBS-RBS; pressure pipeline valve; type test; risk identification CLC number: TH134 Document code: A Article ID:1003-5168(2018)22-0035-03
Risk Source Identification of Pressure Piping Valve
Type Test based on WBS-RBS
LIU Haoran1,2 CUI Weidong1,2 WANG Yan1 WANG Jiabang1 XIAO Teng1,2
(1.Henan Province Boiler and Pressure Vessel Safety Inspection Institute, Zhengzhou Henan 450016; 2.National Pressure Valve Product Quality Supervision and Inspection Center, Zhengzhou Henan 450041)
The type of the pressure piping valves is a verification of the safety performance of pressure pipe valves produced by manufacturing enterprises. The WBS- RBS structure method is used to identify the dangerous sources that endanger the personnel's occupational health and safety in the process of type test. It is beneficial to take the corresponding control measures to ensure the safety of the inspectors, and to reduce the occurrence of safety accidents .
Keywords: WBS-RBS;pressure pipe valves;type test;risk identification
The pressure type valve type test is to carry out product inspection according to the requirements of the type test qualification tester and the relevant product standards, and to design and manufacture the pressure pipeline valve in the fixed inspection place meeting the inspection conditions. Conduct a comprehensive technical review, inspection and testing, and conduct destructive tests if necessary to determine whether the product meets safety requirements and is used to verify the ability of the manufacturing company to produce products that meet safety performance. After the inspection is completed, issue a type test report to the applicant [1] ].
Pressure pipeline valve type test system has many types of dangerous sources, which are intricate and complicated, and are judged by visual experience method, which is prone to omission. In order to identify risks more comprehensively, intuitively and logically, this paper introduces the WBS-RBS method into the pressure pipeline valve type test hazard identification [2,3].
1 Pressure pipe valve type test work breakdown structure Work Breakdown Structure (WBS), that is, using the system principle, the project is decomposed into a suitable, controllable work unit, and finally the boundaries of its unit content. Multiple work units together form one or more column vectors of the hazard identification system. There are usually four types of decomposition: according to the implementation process, according to the plane, spatial position, according to the functional surface, according to the element [3]. Considering the operation process, starting from the implementation process, this study decomposes the structure of the pressure pipeline valve type test work system into 14 units of the first stage as shown in Figure 1 [4].
2 Pressure Pipeline Type Test The Risk Breakdown Structure (RBS) is to break down the risk that may occur according to the actual situation, and the hazard source is identified until the lowest working unit. Multiple risk decomposition levels together form one or more row vectors of the hazard identification system [3]. By summarizing historical experience, the causes of accidents that may lead to pressure pipeline valve type test are divided into five aspects: human factors, physical factors, process technology factors, operating environment factors, and management factors [5, 6]. According to the classification of the cause of the accident, the valve type test danger source is decomposed into 5 primary and secondary 34 units, as shown in Table 1.
3 Pressure pipe valve type test WBS-RBS hazard source identification matrix crosses the WBS and risk decomposition structure RBS, which is the WBS-RBS hazard source identification matrix. The results are shown in Figure 2. Among them, the row of the matrix represents the working unit of the lowest decomposition of the work breakdown structure, and the column of the matrix represents the lowest risk of the decomposition structure of the dangerous source [3].
4 Assessment and classification management of hazard sources Hazard source assessment is an analysis of the probability of occurrence and the severity of the risk after the occurrence, based on which the risk is judged to be acceptable. The degree of risk (risk) is usually expressed as a function of the probability of an accident and the severity of the consequences: R = f(P, S) [7]. Where P is the probability of an accident, S is the severity of the consequences of the accident, and R is the risk. The higher the score, the greater the risk. This hazard source assessment uses the R=P×S method to divide the value range of P into 1-5 grades: never occurred, level 1; annual occurrence, level 2; quarterly occurrence, level 3; monthly occurrence, 4 Level, weekly, daily or frequent, level 5. The range of S values ​​is divided into 1-5 levels: no injuries, level 1; mild injuries, level 2; medical treatment, level 3; hospitalization, level 4; casualties, level 5. The R value range is divided into a slight risk (≤ 5), a general (acceptable) risk (5 ~ 9), a significant risk (10 ~ 19), and a particularly significant risk (20 ~ 25). When the risk index R ≥ 10, the risk is unacceptable and precautions must be taken to reduce or eliminate the risk and monitor the source of the hazard.
Through a questionnaire survey of experienced testers and testers [2], the risk source of risk index ≥ 10 was obtained by statistical method, as shown in Table 2.
5 Conclusions This article refers to human unsafe behavior, risks associated with machinery, electrical, facilities, tools, hazards associated with process media, materials, hazards associated with inspection sites, operating environments, and risks associated with technology and management. On the other hand, the WBS-RBS structure method is used to comprehensively analyze the dangerous sources in the pressure pipeline type test process. Based on the risk identification, the R=P×S model is used to obtain the high risk factors in the test process, in order to construct, quantify and evaluate the system risk of the safety risk assessment index system of the pressure pipeline valve type test. The establishment of the accident prevention mechanism lays the foundation.
references:
[1] General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. TSG D 7002—2006 Type Test Rules for Pressure Pipe Components [S]. Beijing: China Standard Press, 2006.
[2] Luo Yun. Special Equipment Risk Management——The Theory, Method and Application of RBS [M]. Beijing: China Quality Inspection Press, 2013.
[3]Liu Haozhu. Research on safety risk of limestone mine gravel processing system based on SVM [D]. Chongqing: Chongqing Institute of Science and Technology, 2015.
[4]Zhou Jiejing. Research on Subway Construction Risk Based on WBS-RBS Structure[J]. Value Engineering, 2009(11): 76-80.
[5] Li Yujun, Wei Hongzhe. Risk Identification and Control in Safety Valve Calibration Process[J]. Chemical Industry Management, 2014(35): 77.
[6] Pang Xiaoli, Huang Qian. Safety Management of Hydraulic and Pneumatic Components Testing Laboratory [J]. Modern Measurement and Laboratory Management, 2015(6): 59-60.
[7] Jing Guoxun, Shi Shiliang. System Security Evaluation and Prediction [M]. Xuzhou: China University of Mining and Technology Press, 2016.
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