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We operate a 110mw GE frame 6 and unit sometimes trips on Heavy fuel TG trip alarm. Wants to know the meaning of the the abbreviation TG, and also what causes the trip and it remedy
Robert,
There are Frame 6Bs and Frame 6FAs, but I don't believe either are rated at 110 MW. I've never personally heard of a 6FA single-shaft STAG unit (with the gas turbine, steam turbine and single generator all coupled together on the same shaft); that doesn't mean it hasn't been done, but I'm still confused about a 110MW Frame 6. (Sorry; that's just the way I am.)
Be that as it may, you have provided us extremely little, virtually nothing, in fact, of helpful information. When does this trip occur? How long has this trip been occurring? What fuel(s) for starting and shutdown (under normal circumstances)? What kind of control system is being used?
Have you asked this question of the packager of the turbine (GE or GE EPE or BHEL or NTC or some other licensee)?
TG "usually" stands for Turbine-Generator, but that doesn't seem to make sense in your case (with the little information you've provided).
The way to properly troubleshoot alarms with a Speedtronic turbine control panel is to "work backwards" from the logic signal that causes the alarm to be annunciated. So, you would use whatever method, depending on the turbine control system, to locate the logic signal that "drives" the trip and alarm message, and then start tracing through the sequencing or application code (depending on the turbine control system--again, which you didn't tell us) to find out what causes this trip and alarm.
Heavy fuel is not a "typical" fuel, so usually the sequencing or application code is pretty much custom, one-off stuff. Heavy fuel oil usually requires heating (because of the viscosity) and some kind of treatment (chemical additive, usually injected into the fuel stream) to prevent plating of heavy metals from the fuel on the hot gas path parts. Other treatment methods can include centrifugal separation or other means of removing large, unwanted debris and water or other liquid contaminants. (I've seen heavy fuel oil so corrosive that if spilled on leather shoes, it will quickly eat a hole through the leather! So, handling and treatment are important to protect both personnel as well as equipment.)
The auxiliaries for heating and treatment can sometimes be in the scope of supply of the turbine-generator packager, and sometimes not. When they're not, usually some discrete signals from the turbine control system are exchanged with the heavy fuel auxiliary and treatment control system, including alarm and trip signals.
That's probably about all the help we'll be able to provide, as we can't see the sequencing or application code in use in the turbine control system at your site, nor can we examine the piping schematic drawings (P&IDs) to understand the systems and auxiliaries to be of much help. Again, heavy fuel is pretty much a non-standard option, and as such the sequencing and application code is also not-standard.
I wish we could do more, but it sounds like you really need someone familiar with the turbine control system in use at your site to come to your site, sit down and discuss with people at your site exactly what's happening, review the control system sequencing or application code and piping schematics/P&IDs and make some recommendations or provide some assistance with fine-tuning the system(s).
None of that we can do here. And it doesn't sound like you have anyone there who is doing or can do that, either.
And, unfortunately, there is no standard when it comes to abbreviating alarm text messages. 'Twould be nice, but there just isn't.
There are Frame 6Bs and Frame 6FAs, but I don't believe either are rated at 110 MW. I've never personally heard of a 6FA single-shaft STAG unit (with the gas turbine, steam turbine and single generator all coupled together on the same shaft); that doesn't mean it hasn't been done, but I'm still confused about a 110MW Frame 6. (Sorry; that's just the way I am.)
Be that as it may, you have provided us extremely little, virtually nothing, in fact, of helpful information. When does this trip occur? How long has this trip been occurring? What fuel(s) for starting and shutdown (under normal circumstances)? What kind of control system is being used?
Have you asked this question of the packager of the turbine (GE or GE EPE or BHEL or NTC or some other licensee)?
TG "usually" stands for Turbine-Generator, but that doesn't seem to make sense in your case (with the little information you've provided).
The way to properly troubleshoot alarms with a Speedtronic turbine control panel is to "work backwards" from the logic signal that causes the alarm to be annunciated. So, you would use whatever method, depending on the turbine control system, to locate the logic signal that "drives" the trip and alarm message, and then start tracing through the sequencing or application code (depending on the turbine control system--again, which you didn't tell us) to find out what causes this trip and alarm.
Heavy fuel is not a "typical" fuel, so usually the sequencing or application code is pretty much custom, one-off stuff. Heavy fuel oil usually requires heating (because of the viscosity) and some kind of treatment (chemical additive, usually injected into the fuel stream) to prevent plating of heavy metals from the fuel on the hot gas path parts. Other treatment methods can include centrifugal separation or other means of removing large, unwanted debris and water or other liquid contaminants. (I've seen heavy fuel oil so corrosive that if spilled on leather shoes, it will quickly eat a hole through the leather! So, handling and treatment are important to protect both personnel as well as equipment.)
The auxiliaries for heating and treatment can sometimes be in the scope of supply of the turbine-generator packager, and sometimes not. When they're not, usually some discrete signals from the turbine control system are exchanged with the heavy fuel auxiliary and treatment control system, including alarm and trip signals.
That's probably about all the help we'll be able to provide, as we can't see the sequencing or application code in use in the turbine control system at your site, nor can we examine the piping schematic drawings (P&IDs) to understand the systems and auxiliaries to be of much help. Again, heavy fuel is pretty much a non-standard option, and as such the sequencing and application code is also not-standard.
I wish we could do more, but it sounds like you really need someone familiar with the turbine control system in use at your site to come to your site, sit down and discuss with people at your site exactly what's happening, review the control system sequencing or application code and piping schematics/P&IDs and make some recommendations or provide some assistance with fine-tuning the system(s).
None of that we can do here. And it doesn't sound like you have anyone there who is doing or can do that, either.
And, unfortunately, there is no standard when it comes to abbreviating alarm text messages. 'Twould be nice, but there just isn't.
