Hi,

On what basis is the Nomenclature numbers are assigned in GE gas turbines? is this related to sequence?

Thanks in advance

AK

 

For GE-design heavy duty gas turbines, a modified version of the ANSI device numbering system is used.

 

>For GE-design heavy duty gas turbines,
>a modified version of the ANSI device
>numbering system is used.

Hey, can you clarify any? How is it modified? Is there a complete list on the interwebs anywhere? I already have the ANSI list, and it is not very useful for this purpose.

 

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. Then, once you get inside the Mark VI software, the numbers and letters keep on growing.

I don't know of any listing on the public internet for this. GE has it on internal documentation, and with a GE turbine, you get the device summary which lists all the field devices. You can also get a listing from Toolbox for the internal software signals, but they may not all have a full and useful description.

 

Specifically, what kind of GE machine are you working on?

What kind of GE Speedtronic panel are you working on?

What kind of signal name are you trying to understand? Please provide some examples.

For many signal names with one or two digits in them, such as L1Z or L63QT, the numbers can be referenced to the ANSI device number list. L1Z is a starting device logic signal (from the "1" in the signal name); L63QT is a pressure signal (from the "63" in the signal name), and the "Q" in the first position after the number indicates it's for a signal related to the L.O. system.

If you have a Mark IV Speedtronic control system, then the front pages of the Mark IV Speedtronic elementary have an "index" of signal names and descriptions--not always complete, but a good starting point.

If you have a Mark V or a Mark VI, you will likely find a file on the operator interface in the unit-specific directory (F:\UNIT1, for example) called LONGNAME.DAT that has a similar list of signal names and descriptions. (It's an ASCII text file that can be opened with any text editor, including MS-Notepad or MS-Wordpad or MS-Windows; just don't save the file to another format when exiting the text editor!)

But, if you're having trouble understanding particular signal names, give us some indication of the machine(s) you're working on, the types of GE Speedtronic control systems on the machine(s), and some of the signal names you're having trouble understanding. Then we can provide more concise help.