Question 10Gas Turbine - 1st Asst/Chief70% to pass
On an GE LM2500 gas turbine powered vessel you are conducting a borescope inspection of the compressor. What is used on each compressor stage as a reference for indexing the blades?
AI Explanation
The correct answer is B) The locking lug blades.
During a borescope inspection of a GE LM2500 gas turbine compressor, the locking lug blades on each compressor stage are used as a reference for indexing the blades. The locking lugs are designed to prevent the compressor blades from rotating, and their position can be used to identify the orientation of the blades for the inspection.
The other options are incorrect because: A) The IGV (Inlet Guide Vane) actuator is not used as a reference for the compressor blades; C) Witness marks on the nozzle and blade are not typically used for this purpose; and D) Scribe marks on the stator and rotor diaphragm are not the primary reference points for indexing the compressor blades during a borescope inspection.
Related Questions
#8 When conducting a borescope inspection of the compressor, why can airfoil and tip cracks be difficult to detect? #9 Zero reference for the GE LM2500 gas turbine engine is established by the use of which of the following engine components? #11 Which of the following statements about the intercooled-recuperated gas turbine cycle is true? Illustration GT-0031 #12 For the same amount of available power, how does a low speed two-stroke diesel engine compare to a recuperated gas turbine configuration? #13 In a regenerative or recuperative gas turbine cycle configuration, the heat of the turbine exhaust gas is used to do what?