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The reliability of CEDI water treatment system was analyzed. The failure rate and mean failure-free operation time of the system were demonstrated, according to the GO diagram of CEDI system and GO methodology calculating formula, and the conclusion was coincident with actual working. Furthermore, the importance of failure rates of different components was analyzed, and the measures to improve the reliability of the system were also discussed, which were meaningful to the usage and maintenance of the CEDI water treatment system. In addition, this method can also be applied widely to the analysis of the reliability and security of industrial sectors. Introduction The GO methodology is a kind of success oriented system probability analysis technology. It was originally put forward by the American Kaman science company in the mid 1960 s, and was mainly used for missile systems and in nuclear security fields, to solve the problem of the reliability of complex systems. After long time of research and development, the function of the GO methodology is gradually improved, and the quantitative calculation formulas of the operator and general program in the repairable system are derived[1]. The basic idea of GO methodology is translating the system structure, flow chart and engineering drawing into the GO figure according to certain rules directly. Elements of the GO methodology directly represent the logical relationship between the components and parts[2]. According to the GO diagram, using GO operation rules to complete the GO calculation can complete the system reliability analysis. There are many components in a CEDI water treatment system[3], therefore when using the GO methodology to analyze it, the GO figure has compact structure, small volume, and is easy to implement. Based on estimating the system failure rate and mean time to repair of different components of CEDI Water treatment system, the failure rate, mean failure-free operation time, mean probability of working and reliability index are calculated by GO methodology, and the importance of individual parts is analyzed,. Finally, the measures to improve the CEDI water treatment system reliability are discussed. The GO methodology in the application of CEDI systems The reliability of the system characteristics. CEDI water treatment system is an alternating system under normal working state and shutdown maintenance state. System malfunction and complete maintenance time both obey exponential distribution [4]. After reaching stable reliability, the system characteristic parameters include the system failure rate λ, system repair rate μ, system mean probability of working p, mean free error time MIBF=1/λ, mean time to repair MTTR=1/μ, average life-span MCT=MTBT+MTTR, and the failure rate per unit time f=λμ/(λ+μ). The GO methodology of quantitative calculation methodology. GO methodology defines the 17 types of standard operator, as shown in figure1. Diagram text corresponds to the operator name; the number in the operator graphic represents the digital type; 6th International Conference on Information Engineering for Mechanics and Materials (ICIMM 2016) © 2016. The authors Published by Atlantis Press 434 arrow S represents the input signal; and the arrow R represents the output signal [4]. Fig.1 Operator types of GO methodology Operator input signal to the success of state probability, equivalent failure rate and equivalent maintenance rate are respectively denoted by Ps, λs and μs. The success of the operator itself state probability, failure rate and repair rate are respectively denoted by Pc, λc and μc. Operator, equivalent failure rate and the equivalent output signal success state probability maintenance rate are respectively denoted by PR, λR and μR[5]. CEDI water treatment system with the GO methodology involves four operators and its computation formula is as follows. 1) type 1 state of two units The operator can be simulated with an input signal and an output signal of the unit., The unit itself has two states. During the normal work of the unit, the signal can pass; when the unit is in a state of breakdown maintenance, the signal can't pass. The calculation formula is: C S R P P P • = , C S R λ λ λ + = , ) /( 1 C C S S R R R R R P P μ λ μ λ λ λ μ + = − • = (1) 2) type 5 signal generator The operator has no input, and only one output signal. It works as the input signal of the system, therefore it is the system input operator. The data for the operators are the data of the output signal. The calculation formula is: C R P P = , C R λ λ = , C R μ μ = (2) 3) type 6 conducting unit in the trigger conductions The operator has two input signals, the main conditions and input signals. When the condition input signal is successfully input, the unit is successfully conducted. When the main input signal is normally input, the output signal can be normally output. Therefor the two input signal and the unit on the reliability of the logical relationship is in series. The type 6 operators can represent system, there is a certain condition in addition to the main pathways of parts. Calculation formula is: C S S R P P P P • • = 2 1 , C S S R λ λ λ λ + + = 2 1 , ) /( 1 2 2

Reliability Analysis on CEDI Water Treatment System based on GO Methodology