Search results

ControlEng99, Documentation and procedures. It is very rare to find either which is well-written these days. When engineers write documentation or procedures they concentrate on all the things which WERE NOT obvious to them, thinking that everything that WAS obvious to them WILL BE obvious to...

ControlEng99, L14HM is "minimum" firing speed, meaning that ignition should not take place below TNK14HM1 (you noted the value was 16%, so 16% of a nominal 5100 RPM (the typical rated axial compressor speed for GE-design Frame 5 heavy duty gas turbines (the actual rated speed for a particular...

In my opinion, the reason the flow monitor is installed at the outlet is because sea water is the cooling medium. If there is a leak it will be detected in the condensate, and the inflow versus outflow on a single pass shouldn't be detectable unless the leak was huge which, again, would be...

As usual, David_2 is on target! I also buy used text- and reference books. There are many websites which sell used books, but I have had the best luck with Alibris. I have ordered books which were sent from international sellers and which were exactly as described (condition--wise), if not...

yawadu, Unless the steam turbine condenser you are talking about is different from the majority of steam turbine condensers the outflow of cooling water should be almost exactly the same as the inflow. All of the cooling water should pass through the tubes, condensing the steam passing over the...

neurox, NO ONE likes my answer to the question of how often to perform an off-line axial compressor water wash. But, it is always the correct answer. Presuming the unit runs at Base Load the ambient temperature, load and CPD need to be plotted on a daily basis. (It's best to try to record the...

neurox, Misalignment can be caused by thermal expansion (growth), yes? And, thank you for that excellent tutorial on Droop Speed Control FSR and CPD-biased exhaust temperature FSR and the interaction between the two. Heat rate is only guaranteed by the OEM at Base Load, which is when the unit...

RATM, I learn something from nearly every response I make, and from many of the posts others make, too. Money is important, yes; but it's not everything. Wealth comes in a lot of forms, not just monetary, and some days I am the wealthiest person in the world. And, as long as we remain healthy...

RATM, I would agree with you, mostly. In DLN-I and DLN 2.6 the only way to control air flow into the combustor is through modulating the IGVs. For low-load operation in premix combustion mode it's necessary to reduce air flow so much in order not to lean out the premix flame to the point that...

neurox, Most of the GE-design Frame 6B heavy duty gas turbines I have worked on had water cooling jackets on the aft turbine support legs--nearest to the turbine and gas turbine exhaust. The purpose was to limit vertical growth of the support legs to limit misalignment between the gas turbine...

ratm, Axial compressors are designed to operate (continuously; at rated performance) in a very small range of speed. However, the turbine which drives the axial compressor on a single-shaft gas turbine has to be accelerated from zero speed to that speed range. (For many single-shaft heavy duty...

The last response to this thread was in 2010....

Base Load, on grid in some parts of the world is pretty synonymous with off-frequency operation. Look, all I know about starting and shutting down below rated speed is that the axial compressor is very prone to have serious stall/surge without "diverting" a portion of the air flow through the...

CA_ don't know what that means. CRT probably means Combustion Reference Temperature. I imagine the combined CA_CRT comes from the ARES function, and replaces the TTRF1. I imagine--because GE deems ARES to be extremely proprietary--that CA_CRT is a realtime calculated Combustion Reference...

No. Do your units have MBC (Model-Based Control), sometimes also known as ARES (Adaptive Realtime Engine Simulation)?

ratm, You need to understand and internalize something very important about F-class (and FA-class) GE-design heavy duty gas turbines: They were designed to be Base Load machines and they were NOT designed to be operated off-frequency. Off-frequency operation is one of the most common causes of...

ratm, I know I sound like a broken record, but GE Belfort--who has "responsibility" for the programming and functionality of GE-design Frame 9 heavy duty gas turbines (E- and F- and FA-class, and all the perversions of F-class--as well as the HA-class machines)--has a habit of twisting and...

This is a shortcoming of what, otherwise, is a fine application. I would LOVE to know if someone has found a workaround for this! I know one can export a trend (File | Export) to a .csv file, but I haven't found an Import utility. SOMETIMES one can find the executable for the application and...

This discussion was about GE-design heavy duty gas turbine axial compressor during starting and stopping--meaning below rated speed. Your question and graph are not clear. Is the question about axial compressors or centrifugal compressors? Above or below rated speed? I AM NOT any kind of...

Reuter-Stokes is the GE-owned company that produces SiC flame detectors with 4-20 mA. ITS, a company out of Austria, I think, also sells a similar product. Ametek was selling 4-20 mA flame detectors some Customers were using. If you are simply connecting 4-20 mA two-wire flame...