Preprint Case Report Version 1 Preserved in Portico This version is not peer-reviewed

Non-Destructive Test to Diagnosing Wear of Marine Gas Turbine Blades

Version 1 : Received: 17 January 2021 / Approved: 18 January 2021 / Online: 18 January 2021 (15:00:53 CET)

How to cite: Villagrán, Y.; Patiño Ortiz, M.; Hernández Gómez, L.H.; Anzelmetti, J.C.; Del Ángel Ramos, J.A.; García Mejía, J. Non-Destructive Test to Diagnosing Wear of Marine Gas Turbine Blades. Preprints 2021, 2021010350 (doi: 10.20944/preprints202101.0350.v1). Villagrán, Y.; Patiño Ortiz, M.; Hernández Gómez, L.H.; Anzelmetti, J.C.; Del Ángel Ramos, J.A.; García Mejía, J. Non-Destructive Test to Diagnosing Wear of Marine Gas Turbine Blades. Preprints 2021, 2021010350 (doi: 10.20944/preprints202101.0350.v1).

Abstract

In this paper, a non-destructive test to diagnose wear of blade´s compressor of a gas turbine is reported. Gas turbine was operating in Campeche City, Mexico, in a very aggressive environment, where the entry of solid particles is unavoidable. The objective was to reduce cost of maintenance in this equipment. Analysis on a blade of gas turbine was performed, which was in operation on an offshore platform. Compressor blade was exposed to a severe damage by the impact of particles and environmental pollutants such as salts, sands and sulphurs. In first stage of this analysis, a visual inspection with a borescope was performed, which has the ability to illuminate dark internal areas, with a bright light for visual examination and/or make a photographic reproduction in semi-annual maintenance cycles. Images analysis was used to determine the typical failure modes. In a second stage, a tribological characterization was carried out. Chemical composition of the material of blades was obtained. Scanning electron microscopy (SEM) was used to measure roughness and evaluate degradation of surfaces of blades after 30,000 service hours. The points, where peak stresses were calculated, correspond to those places in witch corrosion and some irregular scratches similar to plowing action, was observed. These are the points in which failures take place. Results showed wear modes were originated by a severe stinging action. Also, large craters, similar to those observed in solid particle erosion, were developed by at normal impact. In the same way it could be found some localized areas with a witch corrosion and irregular scratches similar to plowing action, was observed. These are the points in which failures take place.

Subject Areas

Gas turbine blades; Non-destructive testing; Borescope; Optical 3Dscanner

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