Reliability and Availability increasing by using the Reliability Centered Maintenance method in Gas Turbine Generator (Case study)

摘要

In this paper, Reliability and Availability are examined by using the method of RCM (Reliability Centered Maintenance) as well as vibration systems, control and protection are examined as a case study on the behavior of one of the GTG (gas turbo generators) of Tabriz petrochemical company with a capacity of 32MW sea side made by GE. The implementation principles of reliability centered maintenance are adapted from the book of John Moubray (1997). In this case study, failures data has been studied in ten years, in 2 five years (2006-2010 and 2011-2015). Reliability and availability of studied equipment GT (gas turbine) are very important for Tabriz petrochemical according to the process of producing polymers. So in this case study, the number of failures and the failure rate from 2011 to 2016 (the second 5-year period) and (2006- 2010) (the first 5-year period) have been studied to achieve the maximum reliability of the main components of the turbine in terms of performance and their reliability has been studied by using new RCM methodology and equations of reliability to each component. The maximum reliability of system 76% and availability of turbine 96% are achieved in 2014 (the year after general overhaul) and after the Maintenance method based on reliability. The average reliability was 0.372 in the second 5 years (2015-2011) after training the maintenance forces and operation and implementation of RCM method was 0.182 in the first 5 years (2006-2011). The reliability and availability the gas turbine availability have been increased to 0.19 and 1.4% in the second five years respectively. Results of the survey data show that the use of RCM method with related training, Online and Offline suitable vibration system with expert commentators, the design of control system as TMR (Triple Modular Redundant), using a three microprocessors core X, Y, Z, known as P has led to increases the availability and reliability of turbo-generator. In this paper, reliability and availability of equipment have been investigated. The reliability of manpower and the reliability of process also should be calculated in addition to equipment reliability to obtain the production reliability and the data can be evaluated and compared in two identical turbines. The gap between inspections and overhaul is an important point that can be studied. Interaction of optimal methods of Maintenance and costs is one of the important points that should be studied.