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The plot of both LVDTs can be seen in the AutoCalibrate screens, as well as by using 'Verify Current' which outputs the current required to keep the LVDT feedback changing at a constant rate (this is why it has to be done after an AutoCalibrate procedure). If the LVDT feedback was not changing...

Kamel Ibrahim, You are welcome for the information, and thanks for answering most of the questions. The fact that the coalescing filter levels have been high before is interesting. Coalescing filters don't always catch everything, and, if the gas fuel temperature is too low then moisture...

Moderator: A deaerator is a device for allowing entrained air/oxygen in condensate to be liberated, thereby improving the condensate "chemistry" (air attacks boiler internals and in undesirable). It's a fairly innocuous method of removing air, and protecting boiler internals.

getdy, There is so little air flow caused by the rotation of the axial compressor at these low speeds (approximately 0.21%, or approximately 6 RPM, and remember: the IGVs are also closed (approximately 32 DGA) while on cooldown. It's natural convection that draws air through the inlet air...

When was the last maintenance outage for each of the two units experiencing the problems? Do the units have IBH (Inlet Bleed Heat), and is IBH active when the problem occurs? Do the units have Gas Fuel Transfer Valves (GTVs)? Or are they "transferless"? What is the TTRF at the higher...

Kamel Ibrahim, 175 MW on a 9FA is not Base Load, so the machine was probably being operated on Pre-Selected Load Control at Base Load. For such a dramatic loss of load in such a short period of time coupled with a sudden increase in exhaust temperature spreads, something either extinguished...

Hello, Carlos, So, the Diagnostic Alarm you cited could come from any of three TCQA cards in a TMR panel (or only one in a SIMPLEX panel). But, we would need to know which TCQA(s) annunciated the alarm--<R>, <S>, or <T>. The Diag. Alarm basically says that there is some kind of "spike" in...

some_guy, > I believe GE used a hardware license (dongle) on these HMIs. The newest GE Mark VIe HMIs use two (2) dongles: one for PROFICY (CIMPLICITY) and one for WorkstationST/ToolboxST. Yes, you need a dongle (or dongles, as the case may be) to create a turbine control application or...

William Finn, > What GE hardware are attempting to connect? A GE Mark VI Speedtronic turbine control system (from the thread summary). I think it's important to note that while most OPC software is capable of retrieving data via EGD from the Mark VI control panel, they are not capable...

ashiq, One has to do what one has to do--to keep the bean-counters happy. Ultimately, they sign your paycheck, or distribute the funds to compensate you for your work. It would seem 85 C would be a reasonable "ambient" to perform the work of replacing and calibrating a differential...

ashiq, Thanks for the update and feedback!

srh, Don't give GE too much credit for not publishing information in an effort to keep everything secret. They just don't believe that documenting systems and configurations are important. Worse, their Customers allow them to continue this practice by not requiring (demanding) that proper...

srh, GE Speedtronic HMIs are not the most intuitive nor user-friendly of operator interfaces. Along with that distinction comes the one of being about the least-documented of operator interfaces. A 'BASP Virtual Adapter' is not a physical connection. Use your preferred Internet search...

Mohamed Salem, Further to this tripping issue, if I understand the original post correctly, two (2) turbines are both experiencing the same loss of flame trips. So, why would replacing a servo-valve on one unit solve the problem for both units? Servo-valves usually "fail" when the oil...

Others havesaid the same thing earlier in this thread: This is NOT a GE Workstation ST problem; it's a personal computer hardware problem. Others have also said: If the failed hard disk is properly replaced (it may be necessary to make the good hard disk the "primary" hard disk if it's not...

Javier, That's a <b>LOT</b> of zeroes. Way too many, in fact. You should have a 'Control Specification' document which was provided with the Mark VI at the time the unit was installed and commissioned. In Sect. 05.01.nn of the document, you should find a table which lists 'Expected...

Mohamed Salem > But for GT2 I observe all parameters and question which you are asked is the same for GT1 except fuel gas control > valve PM4 feed back was dropped from 56.67% to 37.11% at this moment P2 pressure increase from 26.81kg/cm2 to > 29.104 Kg/cm2 this increasing in the P2 reflect...

Even the expansion of the probe and holder need to be taken into consideration, so replacing them when the turbine is hot may introduce some unwanted error into the measurement if they are not allowed to warm to the temperature of the surrounding metal/environment. Replacing these probes is...

This topic has been covered MANY times on control.com. The typical signal name for P2 Pressure Reference is FPRG (Fuel Pressure-Reference, Gas). Use the control.com 'Search' function to look for occurrences of FPRG and you will find many references to the formula. If you have access to the...

mesi, Thanks for the update, and we're looking forward to hearing the results! Failed accumulators can cause a variety of problems, though it's not clear how it could have caused or contributed to this problem. Charging, and checking the charge of, hydraulic accumulators as a fairly simple...