Calculation of vibrations diagnostic parameter to assess technical status of sleeve bearings of the gas turbine plant

In this article were analyzed causes of failures the gas pumping unit equipment of compressor stations and statistics of theirs’s failures in the course of 10 years. Key causes responsible for failures of sleeve bearings which fix the position of the turbine rotor shaft and ensure minimal clearance in the inflow section have been revealed. An original mathematical model of the basic components in a gas pumping unit has been devised for the purpose of identifying faults happening in the thrust section of the sleeve bearings based on diagnostic parameters. This has made it possible to ascertain the working condition of the sleeve bearings by the change in their rigidity in the oscillating model of the gas pumping unit key elements.
Materials and methods
Lagrange equation, mathematical simulation, measuring system СК-1100.
Results
This paper determined the diagnostic parameter of sleeve bearings in gas pumping units. The results obtained on modelling; in 80% of cases allow to diagnose the gas pumping unit’s malfunctions according to the condition of the sleeve bearings attributable, which represents an excellent practical result for the engineering practice. The diagnostic parameter created by the authors allows effective determination of the bearing assembly’s technical condition in the gas pumping unit when it is in operation. Its use in practical environment is capable of detecting earlydevelopment of any defects and faults in the sleeve bearings of the gas pumping units.
Сonclusions
Let us point out that the mathematical model put forward by the authors can be also used for other types of bearings in the gas pumping unit provided other diagnostic parameters are chosen which are characteristic of the system. Based on the obtained mathematical model, it is planned to develop a program for monitoring the status of sleeve bearings and to install it on the operating facilities of Gazprom Publicly Traded Company.