Search results

Hayoper, One kind of turbine control speed error is, indeed, the difference between the turbine speed reference and the actual speed. BUT, that's most likely not the speed error the Mark VI is referring to when the D-11 is on turning gear. Turning gear speed should be fixed (not variable)...

imad684, >I need MARK V r, s, t and c core keypad operation manual. If you're talking about the LCC/SLCC keypad (on the daughterboard of the DCC/SDCC card in Loc. 1 of the cores you mentioned), there is nothing formally written. There are some procedures in the Mark V Maintenance Manual...

nzfarmer, That little diagram at the top of the black device in the photo looks like a potentiometer, and if I understood your comment about three wires going to two wires a pot can be wired as a rheostat (or vice versa) by connecting one two terminals together, and that can be used as a...

novice001, >In this area maximum temperature is controlled by radial air >flow holes which provide part of shell cooling fan air to >this area. The number and location of open holes is usually >tuned during commissioning. Hmmm..... Is this something GE Belfort are doing with newer...

<b>>>!!!CORRECTION!!!<<</b> It's the average exhaust temperature calculation (TTXM) that excludes exhaust temperatures below a value--<b>NOT</b> the Combustion Monitor. (Excluding ANY exhaust temp T/C value would defeat the purpose of the Combustion Monitor. That's why when (typically) more...

IsaacA, I made a presumption about the value of TTXSP-1. That signal name is unusual; it's usually TTXSP1. And, if you can't find the other two signals (TTXSP2 and TTXSP3) using a User-Defined Display or the Logic Forcing Display, then it's possible and likely that somehow the Mark V was...

sangeetha_ma, >We have a 1000kVA DG Set with 38 litre (16 cylinder Vee) >displacement. We have another 1000kVA DG Set with 28 Litre >(8 cylinder Inline) displacement. What is the generator output of each diesel generator set when the operators are making these comments? Is the generator...

IsaacA, Again, I am forced to say: WOW! Some good information; but you didn't provide the list of Diagnostic Alarms (which must have been <i>HUGE</i>--<b>more than five</b> failed exhaust T/Cs, and three failed P2 pressure transmitters, at a minimum). It's a real credit to the designers of...

IsaacA, By the way, I've rethought my decision to remove the question about Diagnostic Alarms during the operation prior to the exhaust overtemperature trip. Please tell us what Diagnostic Alarms were present and active prior to the original exhaust overtemperature trip from load. And...

IsaacA, WOW! There's a LOT going on here. You mentioned replacing "failed exhaust T/Cs"--but you didn't say how many were failed and how long they had been failed, and how they had failed (high or low). You mentioned replacing "failed intervalve pressure transducers"-plural, so more than...

ghidan, Let's try a slightly different approach.... I'm not trying to describe what VArs "are"--I'm trying to describe what VArs do. Or, the effect of VArs on the system. The effect is to shift the voltage and current sine waves out of phase with each other (on an AC power system there are...

I'm presuming I understood ghidan's question(s)--perhaps I didn't, and he gave the 'Thumbs Down' to my previous response. If that's the case, ghidan, can you please clarify your question(s) so I can try again? If it was someone other than ghidan who clicked on 'Thumbs Down' can you tell what...

mhwest, Yes, this is a problem--re-sale of Mark V cards removed from a panel which has been upgraded or replaced, and touted as having been "tested." Some Mark*/Speedtronic card vendors are more scrupulous and have some rather good testing methods and equipment. Others simply rely on luck...

cacctuschris, Glad to have been of some help! I was thinking the same thing when I was writing my previous response: I have a 50/50 chance of being right, and that's better than most casino games. Please write back to let us know how you fare!

Thanks for the kind words. I'm going to try to keep this as "simple" as possible--and I'm really only offering you a way of thinking about reactive power: VArs. It's my own analogy--a way of describing something that is difficult to describe. A way of trying to understand something that is...

cacctuschris, >Have you successfully replaced one of these actuators or >actuator/valves with something newer and interfaced it with >the RUN and DIR relays? I don't have access to any Mark IV elementaries at this writing, but I hope I can offer some assistance. The reason there are...

esdauto18, The process of DLN tuning for GE-design heavy duty gas turbines involves measuring the oxygen content of the gases leaving the gas turbine exhaust as well as the NOx, and usually CO, contents of the exhaust gases leaving the gas turbine exhaust. Some gas turbines exhaust into an...

esdauto18, >>"SRV and GCV leak"- >You mean gas leak from both valves or the hydraulic oil leak? A hydraulic oil leak from a valve actuator isn't going to be the same safety concern as if the SRV or GCV leaking internally ("passing") gas fuel. It's the valve(s) internally leaking gas...

esdauto18, Black start most often refers to the ability to start a GE-design heavy duty gas turbine when there is NO AC (Alternating Current) available from the grid in the plant, or from a suitably-sized emergency diesel generator which can temporarily supply power for the auxiliary motors...

Frame6BNewB, This is a very common problem on many sites, and it can be difficult to solve depending on the type of regulatory or site requirements for conduit fittings and sealing. I'm just going to touch on the bearing part and then move on to sealing. MOST of the bearings which have...