Hello, in our site we we have several GE MS5002D gas turbines running. I have a problem in understating the working principle of some components in the turbine. MS5002D is a two shaft turbine that utilizes Inlet guide vanes (IGV) mounted to the front of the axial air compressor and also a variable angles second stage nozzles mounted before the 2nd stage turbine wheel. According to my P&ID the fail position of both IGV and 2nd stage nozzles is (fail open) why ?!
And also I want to ask about the minimum an maximum opening angle, for IGV it is 32 DGA when the turbine is stopped and 85 DGA when normally running so IGV opening angle is basically increasing more during startup, but this is not the same for 2nd stage nozzles as the opening angle is 15 DGA when turbine is stopped and 5 DGA when turbine is normally running why it is closing and not opening like IGV at startup ?!
Thanks in advance
And also I want to ask about the minimum an maximum opening angle, for IGV it is 32 DGA when the turbine is stopped and 85 DGA when normally running so IGV opening angle is basically increasing more during startup, but this is not the same for 2nd stage nozzles as the opening angle is 15 DGA when turbine is stopped and 5 DGA when turbine is normally running why it is closing and not opening like IGV at startup ?!
Thanks in advance
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