Hello experts

The reason for this post is to know your opinion about the trend and the spectra collected in an MS 5001 gas turbine, I would like to know your opinion and to what condition or fault the graphics can relate.

In this inspection only those graphics were obtained, the machine does not have a key phasor to know the phase, but even so I consider that a good diagnosis can be made.

in my experience, the condition present in the turbine is attributed to an imbalance and thermal flexion; With respect to the axial compressor, the coupling found wear on the teeth of the gear and a rub on one side, the machine has gear type couplings.

Greetings.

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Original Post

I assume that you have the history of this turbine.  How many fired (factored) hours does the rotor have?  How old is it?  Is this an older turbine?

I see that you label the transducers Velomitors (Is this a trademark and not a generic item?).  Does this have integrated accelerometers or actual velocity transducers?  How old are the transducers?

Now that you have a diagnosis, given above, what do you recommend as corrective action?

 

William_C._Foiles posted:

I assume that you have the history of this turbine.  How many fired (factored) hours does the rotor have?  How old is it?  Is this an older turbine?

the turbine is approximately 20 years old

I do not have the data of the hours of operation, but this turbine only operates 12 hours a day, in 2016 an overhoul was performed.

I see that you label the transducers Velomitors (Is this a trademark and not a generic item?).  Does this have integrated accelerometers or actual velocity transducers?  How old are the transducers?

The machine has 4 velocity sensors bently (velomitors)

The spectrums in the 3 directions are collected with an accelerometer and a CSI 2130

The transducers appear to be the same age as the turbine, their calibration is verified in a laboratory and they are in good condition and within the parameters.

Now that you have a diagnosis, given above, what do you recommend as corrective action?

 I really wanted to know the diagnosis you can give just by looking at those graphs.

greetings William

The rotor may not be 20 years old - at least since an overhaul.  12 hour a day operation is a lot of starts over 20 years.  This would have had the rotor overhauled.

How old the rotor is relates to what you might need to do.

20 years ago, I would have thought other sensors would have been used for the control of the turbine - other than 'Velometers.'  20 years is a long time for the sensors.  I take it that these sensors are located as redundant pairs for control purposes?

You should get a shaft trigger on the shaft for future data.

It is probably a good idea to let us know the exact model of the BN Velomitor.  The standard 330500 BN Velomitor has a limited temperature range (upper 121 deg C or 250 deg F) it can be exposed to, due to its signal conditioning electronics being located in the same case as the sensing element.  Your transducers, especially if they are the 330500, and if they have been there for an extended period could also have degraded substantially.

The newer 330750 and 330752 High Temperature Velomitor System (HTVS) has a different construction to solve this problem.  Since the electronics are what limits the temperature. the design "splits" the sensing element from the signal conditioning electronics and the two are connected by suitably protected cable.  The sensor is good for 400 deg C (752 deg F) and the electronics are mounted in a cooler environment.

John from PA posted:

It is probably a good idea to let us know the exact model of the BN Velomitor.  The standard 330500 BN Velomitor has a limited temperature range (upper 121 deg C or 250 deg F) it can be exposed to, due to its signal conditioning electronics being located in the same case as the sensing element.  Your transducers, especially if they are the 330500, and if they have been there for an extended period could also have degraded substantially.

The newer 330750 and 330752 High Temperature Velomitor System (HTVS) has a different construction to solve this problem.  Since the electronics are what limits the temperature. the design "splits" the sensing element from the signal conditioning electronics and the two are connected by suitably protected cable.  The sensor is good for 400 deg C (752 deg F) and the electronics are mounted in a cooler environment.

hi John

The velomicity sensor is BN 330750, its temperature range is from -55 °C to 400 °C, the exhaust temperature is 300 ° C.

At first we suspected the sensor, but this was replaced by an exchange of the sensor with another similar machine.

the vibration values were checked with an accelerometer placed closest to the velomitor, these readings were similar

greetings John

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