10.14489/td.2020.08.pp.024-028

2020, 08 August

DOI: 10.14489/td.2020.08.pp.024-028

Ramazanov R. M., Ramazanov M. I., Sapargaliev T. A., Kim A.V.
MATERIALS SCIENCE RESEARCH DEFECT OCCURRENCE AND RUPTURE OF THE GAS PUMPING UNIT AXIAL COMPRESSOR BLADE
(pp. 24-28)

Abstract. The article discusses the results of the study of the causes of destruction of the axial compressor blade and the causes of the defect of the working blade 10 stage GTU GPA type GTK-10-4 station No. 18 of the compressor station “Dzhangala”. The blade is made of X20Cr13 steel (AISI 420). The blades have an operating time of 23 284 hours after the last repair. Chemical analysis, fractographic analysis, and hardness measurements were performed. The probable cause of defect formation and destruction of the blade is established. The measured hardness values comply with the standard. А study of the chemical composition of metal blades is not revealed a deviation in the content of the main alloying elements. The results of fractographic analysis showed that the destruction caused the presence of a subsurface defect. The defect is an oxidizing shell of about 9×4 mm in size with propagation in operation to the outer surface. In operation, as a result of corrosion, static and dynamic stresses, a crack was formed in the area of the source with exit to the surface along the input edge of the blade. Non-destructive testing was performed on the remaining blades. No defects detected. On the basis of which it was decided to continue the operation of the working blades of the GTK-10-4 turbine, subject to periodic monitoring.

Keywords: gas pumping unit, gas turbine unit, axial compressor, blade, defect, destruction.

+ - About the Authors Click to collapse

R. M. Ramazanov (The Federal State Unitary Enterprise “Central Research Institute of Structural Materials “Prometey” named by I. V. Gorynin of National Research Center “Kurchatov Institute”, Saint-Petersburg, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
M. I. Ramazanov, T. A. Sapargaliev (Engineering and Technical Center of Intergas Central Asia, JSC, Uralsk, Kazakhstan) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
A.V. Kim (West Kazakhstan Innovative and Technological University, Uralsk, Kazakhstan) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Gulyaev A. P. (1966). Metallurgy: a textbook for technical colleges. 4th ed. Moscow: Metallurgiya. [in Russian language]
2. The blanks for turbine and compressor blades are stamped, forged and rolled from corrosion-resistant and heat-resistant steel. General specifications. (2010). Industry standard No. 108.020.03–82. Saint Petersburg: OAO «NPO TsKTI». [in Russian language]
3. The working and guide vanes of the compressor to the turbine of the GTK-10, GT-750-6, GT-6-750, GTN-6, GTN-16, GTN-25 units. The procedure for troubleshooting, repair and replacement of blades on the COP. The procedure for the delivery of blades to repair enterprises and the issuance of repairs. (1987). Technical conditions No. 481981 6.00002. RD. Moscow: MINGAZPROM. [in Russian language]
4. Kryukov I. I., Rybnikov A. I., Mozhayskaya N. V. (2015). Investigation of the metal and the causes of destruction of the working blades of axial compressors of GTK-10-4 and GT-750-6 units during operation. Gazoturbinnye tekhnologii, (2), pp. 32 – 37. [in Russian language]

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