good evening:

i would like to know what the factors the effect the time to reach the turbine to full speed No load (FSNL). in our plant, there are two machine (frame -6) but one of them take less time to reach FSNL compare to other. what the factors contribute to that?

 

Good day,

You have provided very little in the way of actionable detail; for example, what is the time it takes for each turbine to reach FSNL from:

a) Initiation of START command?
b) Detection of flame?

Factors affecting start-up timing can include, but are not limited to:

1) Type and condition of starting means (for example, if the starting means is a diesel engine how long has it been since any maintenance was done on the diesel engine(s))

2) Type and condition of torque converter (for example, has either or both of the torque converters been replaced with new or refurbished units)

3) Type of Speedtronic control panel (Mark V; Mark VI; SIMPLEX or TMR)

4) Tuning of start-up parameters

5) Condition of axial compressor (for example, how long since an off-line water compressor water wash for each machine)

6) Condition of turbine hot gas path parts (time since last hot gas path inspection or major inspection for each machine)

You also have neglected to tell us the age of the two machines (were they installed at the same time; were they installed two or five or ??? years apart).

Also, please tell us what the values of the following Control Constants are <b>for both machines</b>:

FSKSU_FI
FSKSU_WY
FSKSU_IA
FSKSU_AR
K2TV
K2WU
K2W

Also, what fuel is being burned in each machine? If the machines can be started on more than one fuel, does the time differential exist on both fuels)?

Are there higher exhaust temperature spreads or flickering flame indications on either or both machines during starting and acceleration to FSNL?

Lastly, but possibly most importantly, you failed to tell us when the difference was first noticed, such as after a recent maintenance outage, or has this always existed since commissioning of each machine.

You have been asked to provide a lot of information, and should you decide to continue with this thread on this forum you need to answer <b>every</b> question, even if you feel the question is irrelevant to the problem you presented. Without all of the information asked for, it will be difficult to tell you much about the issue at hand.