SPECIAL METHODS FOR INTERPRETING THE SPEED VIBRATION SPECTRUM FOR DIAGNOSTIC OF GAS-PUMPING UNIT STATE

Abstract

The relevance of the research is caused by the need to develop additional methods for assessing the technical state of gas-pumping units of the main gas pipelines compressor stations. Emergency situations entail consequences of a global nature for the material base and the surrounding environment. The main direction of maintenance of trouble-free compressor stations operation is the maintenance of the technical state of gas-pumping units at the required level. The main aim of the research is to develop a method for assessing the technical state of gas-pumping units by interpreting the vibration spectrum of oscillations of the bearing housing of the low-pressure turbine of the unit with the formulation of the conclusion «there is a defect/there is no defect». The objects of research are GTK-10 gas-pumping units operated by PJSC Gazprom. Units of this type provide more than 8 GWt of installed capacity, which is more than 20% in the country's gas-pumping system. The database for the research is the data of the results of vibration units diagnostics for 4 years. Methods. To assess the technical state of gas-pumping units based on the interpretation of the vibro-survey spectrum, it is proposed to use the method of constructing a separating surface in a 340-dimensional phase space according to the characteristics of a training sample of vibrospectra. It is established that the reliability of the classification of the spectrum rises with increasing the training sample volume, formed a priori. The greatest effect can be achieved if there are separate strongly marked harmonics in the spectrum. Results.The authors have constructed a hyperplane to diagnose the technical condition of gas-pumping units of compressor stations of PJSC «Gazprom» by interpreting the spectra of vibration analysis. Taking into account the number of spectra excluded by the separating surface, the probability of erroneous classification of the working vibro-spectra of a gas-pumping unit is set in the range of 0,15–0,30.

Keywords

• training sample
• vibration velocity
• separating surface
• dimension
• algorithm
• taxon