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Rizwan, What you need is a known calibration point, which is what the orifice calibration data sheet provides. If you do not have this on file, you could try using information on the orifice plate to determine the manufacturer and an identification number and then go back to the supplier and...

Mathematically and from control point of view it doesn't make any significant difference EXCEPT: 1. putting the square root extraction in the transmitter unloads the DCS by one calculation, not very significant with today's processors. 2. for a compressible fluid, temperature and pressure...

Dear Sanjeev Vijayan, Where we have used separate bypass and HRSG dampers we have had better control with louvers than single blade. However, we generally used them only during startup -once on line, we were full open to the HRSG and full closed to the bypass stack. The louvers gave us a...

1. Unless the pressure is constant you will also have to compensate for that as well. 2. Basic relationship is: Q = K * SQR(2*delta-P/density) You can simplify this all down to: Q = K * SQR(delta-P * T1/P1) where K is all constants combined, delta-P is measured differential pressure, T1...

You don't say what the exhaust arrangement is. If you haven't designed it yet and you really need to control via dampers, I think separate WHRU and bypass stack dampers are a slightly better alternative than a single blade diverter damper. However, either way does a mediocre job at best...

Just a quick comment on constant settable droop: If the DWATT signal is from a single (non-redundant) transducer, then you don't have constant settable droop. If you have redundant watts transducers you PROBABLY have constant settable droop control. Also, for most DLN combustion systems...

Look at the reactive capability curves for your generator. If you go outside those limits, you can damage the generator. There may be a protective trip on this, but I believe operating outside the limits generally results in overheating which is alarmed via RTD's.

If the transmitter output is already a square root of the differential pressure, then the DCS should just scale the signal directly, without taking the square root again. If the signal from the transmitter has no pressure &/or temperature compensation, and if this is required, the DCS will have...

You will have to determine if the output of the flow transmitter is actually flow or differential pressure. Some smart transmitters can do the square root extraction internally. You don't say what the process fluid is. If it is a liquid, you may not need any temperature and pressure...

I agree with RussB that the most likely reason is to minimize their spare parts inventory. However, unless compliance with the requirement puts you at a severe competitive disadvantage, just comply. Customers over there generally don't like to revise their specifications unless there is an...

The electronic over-speed setting is 110%. That means the turbine will trip if the speed gets to 110%. When testing the mechanical bolt, the 110% electronic trip is inhibited, but you will trip the turbine when the speed reaches the setting for the bolt. I think the setting for the mechanical...

If the back pressure is increasing enough to cause problems with the expansion joints it would indicate a problem in the heat recovery system. What fuel are you running on? Do you have soot blowers and, if so, have you used them? Is there any back pressure protection on the GT? (You didn't...

Please clarify: Did your GT load change from 146 MW to 140 MW (loss of 6 MW) or did your GT load change from 286 MW to 140 MW (loss of 146 MW)? If you lost 6 MW (4%) in GT load you probably don't have a problem - it is probably due to the increased back pressure on the exhaust through the...

Frame size was based on the diameter of the turbine. It is NOT expressed as a Roman Numeral. A frame 5 gas turbine is another name for a MS5001 or MS5002 gas turbine. The MS5001 is a single shaft gas turbine approximately 50 inches in diameter. The MS5002 is a 2-shaft gas turbine, also...

ISA is a much better source for instrument standards.

The primary purpose of the Inlet Bleed Heat is to keep the compressor out of surge (pulsation). Inlet guide vanes are also used for this purpose during startup. Once the unit is up to operating speed there are 2 types of control for the IGV's: 1. Simple cycle applications: The IGV's open...

> in new gas turbine there is no over-speed trip both frame 5 and 7 why?? < I don't know of any GE gas turbine lacking over-speed protection. Codes require it. While the mechanical bolt is no longer used, there are triple redundant probes and monitoring with 2oo3 voting for the trip protection.

>Can you tell us exactly what GE did to >solve this problem. We are in contact >with them but up to now the problem is >not solved. Plz find below more info.: The fix for the N-tron switches was to replace them. Since that has already been done, and per other information in your posting, I...

CSA: Sorry, I don't have a TIL number. I recently retired from GE and no longer have access to the system. We replaced a number of the IONET Ethernet switches on a project I was involved with prior to retiring (still in commissioning phase). This only affects Mark VIe units, most of which...

GE has discovered a problem with some of the network switches used in the IONET. Please contact GE on this matter.