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I don't know the exact percent of rated fuel flow, but I would expect it to exceed 25%. The axial compressor is a big load.

The "Pull-in coil" moves the solenoid to its energized state. It uses a higher current coil to do this. The "Holding coil" maintains the solenoid in the energized state, with a lower current. There is an internal switch in the solenoid that transfers from the pull-in coil to the holding coil.

>I mean that I want to know for example >if I can send two different set point >signals of a level switch to two >different systems (about DPDT)or DPDT >switch can only send one switch >point???... To answer that, you will need to find the specification of the switch. There are devices...

"MLI" stands for Model List Item. The Model List is a top level list of the major drawings for a GE gas turbine. Each drawing is a different Item number. For example, Item 0414 is always the Piping Schematic Device Summary drawing. Some of these drawings are internal and some are provided to...

A couple of comments: On a typical combined cycle unit, steam turbine considerations usually limit the loading/unloading rate to a maximum of 5% per minute. This is with a hot steam turbine. You may be able to improve on that if your steam turbine control has a stress limit function which can...

The modifications to ANSI are done by GE. The ANSI list mainly consists of the basic 2-digit number code (like 63 for a pressure switch or 71 for a level switch). GE adds letters and then dash numbers and sometimes a final suffix letter to get a unique nomenclature code for a particular device...

Also note that increasing the exhaust temperature may not produce more steam, only steam at a higher temperature. In fact, the mass flow may be reduced. Closing the IGV's, while it increases exhaust temperature also reduces exhaust gas flow. If you want more energy out, you have to put more...

> Frame 3 two-shaft (MS-3002) Also Frame 5 two-shaft (MS-5002A and MS5002B). There are many more MS3002 regenerative units out there than MS5002.

Process Value, Per Mxromen's posts, this is not supposed to be a full shut down of the power block. In fact, he said they did not have this problem during a normal shutdown of unit A, but only when unit A tripped or had a load runback (a rapid unloading). The intent is to just shut down 1 gas...

GE has provided "flying restart" capability for some projects. I don't know what changes are required; I was not directly involved in it. I just know it was done. I believe it did require coastdown until 14HM reset. As for friction braking, in addition to money, you need space to install the...

> 3. we don't have a compensated drum level measurement (density correction > for pressure and temp) Dear Mrxomen, Regarding the above statement, I would be extremely surprised if your selected drum level is not corrected for density, based on drum pressure. (Since the drum is at...

mxromen, It would be helpful to know what the control system is and who provided it. Also, something I forgot to ask before is whether or not you have any load control active at the time you are shutting down unit A. If you were shutting down from a part load condition, where Unit B was at...

Is this a new problem? Were shutdowns of one unit previously successful, without tripping the other unit? If so, what has changed? Are you using an autosequence program to shut the unit down? Is the plant control GE ICS (Mark VI or Mark VIe), or is it a standard DCS (Foxboro, ABB, Emerson)...

You don't say what differential air pressure you know. But maybe it doesn't matter, because I don't think you have enough parameters. I don't know what gas turbine you have, but I can tell you that when GE has a requirement to provide the airflow measurement they include a special set of sensors...

The gain and offset are based on pressure units in PSI. So, for 3000 RPM (100% speed), I get 422.23 PSIG, which is 29.11 barg. The HMI is set to display units in bar, but the Mark VI (or VIe) does its calculation in PSI. The HMI converts the PSI to bar, but the internal calculation remains in...

CSA - some comments: 1. TNH is always speed in %. TNH_RPM is usually used for speed in rpm. 2. I agree that 3.8 psig is low for P2 pressure at firing speed. P2 has to be greater than compressor discharge pressure or you just aren't going to get the fuel to flow into the combustors. 3...

>Where I can find your reference drawing "4108". This is a drawing provided by GE. Where you store drawings at your site is unknown to me. "4108" is GE's MLI (model list item) for this document. It will have a number of the form nnnBnnnn. ("n" means any digit from 0 to 9, although the first n...

Start by studying the "4108" drawing. It is a network architecture diagram, and will show which HMI's are servers and which are not. There is usually an overview diagram on sheet 3 or 4, and then a detailed network diagram on the next 2 or 3 sheets. Then there is usually a sheet that shows...

GE Steam Turbine practice (before and after GE purchased B-N) is to wire the vibration proximitors directly to the turbine control (Mark V or Mark VI or Mark VIe). This is because on the steam turbines, the proximity probes are used for protection (unlike on gas turbines where seismic probes are...

My comment was about the Mark V control. If you need the Dry Low Nox version of gas fuel, the Mark V control may not have sufficient capacity to handle it. However, if that is required, it will likely not be economically attractive to add gas fuel.