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Scorpio, Have you tried using your preferred Internet search engine to look for answers to your questions? One of the best references on steam power and boilers is "Steam, It's Generation and Use" which is published and maintained by Babcock & Wilcox (a major boiler manufacturer). It is a...

Dear Zihni, Do you know if it's possible to transfer fuels automatically on the two units? Not every dual fuel unit has the capability, or has the capability enabled. Presuming the capability is present and is enabled, all that's required is to select the fuel you wish to transfer to by...

Energy engineer Frank, <b>When did this problem start?</b> That should be the <i>first</i> question that is always asked when something begins to exhibit signs of a problem. Then, the next question should be: What changed just before the problem(s) started? These two questions can...

Dear, In my experience, differential expansion sensors are typically set when the turbine is "cold", and with the rotor in what's considered to be the "normal" position (against the active face of the thrust bearing). This is so that as the turbine and shell (casing) warms and expands the...

Mahabub, This topic is not unique to 9Fs; many F-class turbines including 7F & 7FA turbines have also experienced the same issue. This topic was previously covered in the following thread: http://www.control.com/thread/1339177794 The thread was found using the search term:<pre>...

MAMBO, The data you have provided shows that while Base Load is selected, the Secondary Exhaust Temperature Control Reference (TTRXS) is lower than the Primary Exhaust Temperature Control Reference (TTRXP). This is probably because the BTU content of the fuel is much lower than expected (for...

Dear, You started this thread many months ago. What have you decided with respect to a vendor/supplier of an upgrade turbine control system for your site? Have you listed the important requirements for your unit? Meaning, does your turbine need to be running 24 hours per day, 7 days per...

meshal, We would need a <b>LOT</b> more information to be of much help. But, rest assured: Load is directly proportional to fuel flow. Flow instability will cause load instability. Your mission, should you choose to accept it, is to try to determine what inputs to the MIN SEL GATE might be...

Fuel valve characteristics are not adjusted in control system. The Service Manuals provided with the turbine and auxiliaries should list the proper part numbers for any replaceable trim or valve internals. If there is any question, you could always contact GE, one of their licensed parts...

Ebing and G.Rajesh, 'Loss of Flame' means: Flame was lost <b>BEFORE</b> any condition was detected that would have tripped the turbine by shutting off fuel (which would ultimately result in a loss of flame--but AFTER a trip condition was detected and annunciated). In other words, 'Loss of...

MAMBO, Where you brought to site to help with the performance problem? Yes; a drop in BTU content would definitely cause a drop in performance. BTU is a measurement of the amount of energy contained in a material. However, it's surprising that the turbine could be started (reliably and...

ESKAY, STILL more operator interface problems; this time on venerable <I>s. The F:\SPOOL directory is full. "Full" means it has more than 100 files in it because people keep pushing PRINT SCREEN before the print spooler can spool the file to the SPOOL directory and then the PRINT...

Ghaith, Thanks for the feedback!

Ghaith, Mark VI dynamically assigns signal names to memory locations, which can lead to the kind of problem you are experiencing with downloading "old" software. I still highly recommend you get someone knowledgeable to site to help with the problem(s) you are experiencing. There is more...

attali abdelkrim, It's not clear why you restored the HMI from back-up disks.... And, the fact that you took the "shotgun" approach makes troubleshooting that much MORE difficult. This admission adds more credence to my belief that we don't know the whole story about what's been going on at...

Ghaith, Have you checked the same Control Constants as recommended above? What are the present values of those Control Constants? What happened to the original poster was that the GCV wouldn't close to limit speed to 100% (FSNL). Since the SRV P2 pressure reference is a function of turbine...

Newtothis, > It's, just the ordinary stopping command. What control strategies are used For this sequence? It would be most helpful if you would tell us why it's necessary for the fan to stop turning quickly or be prevented from turning when commanded to stop. Many applications don't...

attali abdelkrim, >> Are you using ABB DCS, if yes please check the configuration on DCS side, ensure it is 'Modbus TCP Gateway'. > We are using Honeywell DCS. When you post to a forum like this with a problem, you need to provide as much information as possible in order to receive the...

Have you tried monitoring the field current output to see if it's dropping below the setpoint? One way to control the speed of a DC motor is to vary the current applied to the field (the stationary windings) of the motor. As the current is reduced, the speed of the DC motor will increase...

Brukamdo, If more than one governor on a grid is in Isochronous mode then one of two things has happened. Either there is some means of Isochronous Load-Sharing employed by all the governors operating in Isochronous mode, OR, the Isochronous governors have all been de-tuned, likely to a great...