Plant was started up by the “SEQ Start”. Sequence 20, 21 and 22 had step Disable, Sequence 23A and 23B had step Enable. (This was done for a reason) but this meant that the auto start held at Sequence 23A StepA waiting to be stepped on.
The plant was then run up in manual.

Q1: With Seq 20, 21 and 22 Disabled and Seq 23A and 23B Enabled and the “Seq Start” initiated but not complete, is it ok to “Reset” the “SEQ Start”?
If so then just by resetting Seq 20 will this rest all, or do we reset all individually?

Q2: If we do not reset any of the above and given that the auto start was not completed will the “Seq Stop” if initiated do its job off load the plant?

 

This doesn't sound like any "standard" software. There have been numerous implementations of "one-button" plant start-ups for cogeneration plants, which included the gas turbine but also started boiler feedwater pumps, vacuum pumps, and on and on and on and... Some were (MUCH) better than others. Some had a start command on the GE turbine operator interface which was "tied" to the plant DCS one-button start. Does it normally work at your plant?

ALL of these schemes are pretty unique to the plant and equipment used at the plant, and there are few plants which are built alike. There has been talk of some organization developing and promoting a one-button start standard for years, but the status of the project is not known nor where it originated (but the best money says somewhere in the European Union).

This sounds like a very sophisticated, and unusual, scheme which, without much more detail, would be extremely difficult for this author to comment appropriately on--unless there are others here with a similar system. It also sounds like the designer(s) built some kind of logical ordering/numbering of steps/processes in for trouble-shooting and understanding.

Have you consulted your plant's Operation Manuals or Design Manuals for details? In most of these one-button start schemes, the gas turbine control just gets signals to start, synchronize, load/unload, in response to some "master" control, usually a DCS (which could be a Speedtronic Mk VI these days!).

And, as you seem to be alluding to, there is always the "Manual" option when the one-button start doesn't satisfy.

There have been horror stories about "one-button start" start-ups which took months and years of work, only to be finally abandoned in favor of the traditional human operator coordinating events and activities. Great idea--quite not seen through to a successful conclusion.

markvguy