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I would appreciate any information on the commissioning on a GE PG658 1B gas turbine.
Any and all information would be welcome.
Any and all information would be welcome.
What does GE recommend for a commissioning procedure?
When commissioning any machine of this size it's necessary to prove ("loop-check") all of the inputs to- and outputs from the control system to make sure they are all working properly and providing the proper signals at the proper times and receiving the proper signals to control, protect and monitor the turbine, auxiliaries and driven device. Devices equipped with LVDT (position feedback) will require calibration of the LVDT feedback. Devices with limit switches may require adjustment.
Any device capable of tripping the unit (shutting off fuel in the event of any emergency condition) will need to be tested to be sure they will operate properly. Most GE Speedtronic turbine control systems will have a primary trip "system" and an "emergency" trip control system and both "systems" must be proven capable of shutting down fuel in the event of any emergency (primary or "emergency").
And, then someone will need to prove that the starting sequence works properly on all fuels the unit can be started on. And that the shutdown sequence works properly. And the loading and unloading sequences work properly. Any external load signals must also be confirmed to be working properly.
If the unit is a generator drive, then the synchronizing system will need to be commissioned and the details of that will have to be determined on site. If it is a generator drive, there will also need to be some generator excitation system commissioning (also commonly called the "AVR").
The exact details of these sequences are all specific to the unit being commissioned. While Frame 6 turbines are basically very similar, the auxiliaries and the fuels and the sequences and the application can vary greatly from one Frame 6 to another. The starting means (electric motor; diesel motor; expander turbine) can vary greatly as can the type of torque converter (if used).
So, a good understanding of the unit (it's auxiliaries) and the application are really critical to forming a commissioning procedure that is specific to the unit being commissioned. A "cookbook" procedure (like reading a recipe from a cookbook to prepare a dish) is not really applicable to turbine commissioning; there are just too many variables. But, many of the basics (loop-checking) are very similar and standard, but to document them so that anyone could loop-check every input and output would be a monumental task, and it would really only apply fully to the turbine it was designed to be used on.
But, you should really rely on GE for their guidance and input on how the commissioning should be done. The problem is that GE doesn't really have "a commissioning procedure" that all of their TAs and field engineers use; everyone seems to develop their own, and while similar, there is nothing officially documented for use with any particular type of machine. Amazing, but true.
When commissioning any machine of this size it's necessary to prove ("loop-check") all of the inputs to- and outputs from the control system to make sure they are all working properly and providing the proper signals at the proper times and receiving the proper signals to control, protect and monitor the turbine, auxiliaries and driven device. Devices equipped with LVDT (position feedback) will require calibration of the LVDT feedback. Devices with limit switches may require adjustment.
Any device capable of tripping the unit (shutting off fuel in the event of any emergency condition) will need to be tested to be sure they will operate properly. Most GE Speedtronic turbine control systems will have a primary trip "system" and an "emergency" trip control system and both "systems" must be proven capable of shutting down fuel in the event of any emergency (primary or "emergency").
And, then someone will need to prove that the starting sequence works properly on all fuels the unit can be started on. And that the shutdown sequence works properly. And the loading and unloading sequences work properly. Any external load signals must also be confirmed to be working properly.
If the unit is a generator drive, then the synchronizing system will need to be commissioned and the details of that will have to be determined on site. If it is a generator drive, there will also need to be some generator excitation system commissioning (also commonly called the "AVR").
The exact details of these sequences are all specific to the unit being commissioned. While Frame 6 turbines are basically very similar, the auxiliaries and the fuels and the sequences and the application can vary greatly from one Frame 6 to another. The starting means (electric motor; diesel motor; expander turbine) can vary greatly as can the type of torque converter (if used).
So, a good understanding of the unit (it's auxiliaries) and the application are really critical to forming a commissioning procedure that is specific to the unit being commissioned. A "cookbook" procedure (like reading a recipe from a cookbook to prepare a dish) is not really applicable to turbine commissioning; there are just too many variables. But, many of the basics (loop-checking) are very similar and standard, but to document them so that anyone could loop-check every input and output would be a monumental task, and it would really only apply fully to the turbine it was designed to be used on.
But, you should really rely on GE for their guidance and input on how the commissioning should be done. The problem is that GE doesn't really have "a commissioning procedure" that all of their TAs and field engineers use; everyone seems to develop their own, and while similar, there is nothing officially documented for use with any particular type of machine. Amazing, but true.
