Tagged With "Accessory Drive Gear"

Topic

SKF accessories delivery/availability

tcvib ·
All, I am need of a SKF GX 75 rubber shroud for one of our analyzers. My contacts say it will be September before I see them. Does anyone have any of these lying around that could send me one from the US? PM me. Thanks
Topic

Converting Velocity Signal from Velocity Vibration Transducer

DuPlesis ·
Guys, I would like to have inputs from the fellows who have worked with SKF Microlog Analyzer. I have a Permanent installation, stud mounted Velocity Transducer (Make: CEC Model:4-131) installed on Accessory Drive Gear box of Solar Titan 130 Gas Turbine. I want to get Acceleration Data from the BNC Connector of this Velocity Sensor. However, in the setup for Micro log Analyzer when I select Vibration sensor type as velocity sensor the measurement units I get are only for Velocity or...
Topic

High Slow Roll Reading on 1 Probe

DuPlesis ·
Guys, I have a Solar Titan 130 Gas Turbine. It's a 2 Shaft Gas Turbine. 1st Shaft - Gas Producer Rotor - Consists of Axial Compressor and 2 Stage Gas Turbine. Air Intake End of this rotor is connected through a spline coupling to the accessory drive gearbox. Please see attached layout image. 2nd Shaft - Power Turbine Rotor - 2 Stage Gas Turbine Discs providing mechanical drive to the Centrifugal Gas Compressor All the radial bearings are fitted with X & Y proximity probes. Slow Roll...
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Re: High Slow Roll Reading on 1 Probe

John from PA ·
When inconsistent readings exist in a probe pair I always suggest you start with a “loop test” to insure correct wiring. In a loop test, you get as close as you possibly can to the probe and then perform some action that results in a gap change. For instance, I might disconnect the extension cable at the proximitor “X” Probe of the 3 bearing, then look for a corresponding change in gap voltage at the rack or even all the way back to System 1. While doing the loop test, verify that the...
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Re: High Slow Roll Reading on 1 Probe

Shurafa ·
I second John in his recommendation to verify the functionality of the loop. But I prefer before touching the machine or loop, it is better to have further analysis for the available data. You might discover a need for more actions so you can address them all in the same shutdown window. The orbit at 335 rpm shows very directional shape along the direction of Probe Y while the reading in the direction of Probe X is very low. An abnormal thing in the Bode plot for Bearing 1 Y probe is that...
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Re: High Slow Roll Reading on 1 Probe

William_C._Foiles ·
Additionally, I would check that probe locations are correct. The probe other probe of the x-y pair should be checked too. It could be that there is high slowroll and only one sees it.
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Re: High Slow Roll Reading on 1 Probe

DuPlesis ·
Thanks Guys @John from PA & @Shurafa , I will do the loop check in next available opportunity and share the outcomes. @William_C._Foiles Do you mean to check axial location of the probes in the pair? or the angular location in same plane? In any case, it's not possible to verify any of them as they are not accessible.
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Re: High Slow Roll Reading on 1 Probe

William_C._Foiles ·
Check the axial position and the side that the probes are on, that is a good process for diagnostics. Also, one should check the other probe if this is an x-y pair, because you do not know which one may be reading incorrectly. Too often, people want the measurement that looks good to be correct. If you have good reason to suspect a particular measurement, it may make sense to only look there - like maintenance was just done on a sensor.
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Re: High Slow Roll Reading on 1 Probe

Rohit02 ·
Can you please share the maintenance history also. Is there any job carried out or the machine was in standstill and it was a normal changeover or startup.
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Re: Converting Velocity Signal from Velocity Vibration Transducer

John from PA ·
A previous discussion exists on this forum...see https://www.maintenance.org/to...elocity-acceleration . Suffice it to say that what you want to do is not a recommended practice and hence the reason the option is not offered.
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Re: Converting Velocity Signal from Velocity Vibration Transducer

Walt Strong ·
The velocity sensor only has a F-max of 2000-Hz, so why try to convert to acceleration? I don't know about the SKF software, but CSI allows acceleration display (signal differentiation) in the spectrum view (not waveform). It does not allow sensor definition Velocity->Acceleration for the analyzer, but perhaps the new analyzers and software do. Walt
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Re: Converting Velocity Signal from Velocity Vibration Transducer

Boilermaker ·
With the SKF analyzer and software the vibration data, the time waveform and spectrum units will be in units of the transducer, in your case velocity. However, in the software you can convert the spectral data into displacement and acceleration. Just right click in the spectrum plot and select the unit you want. Right click and select "Reset settings" to bring back to the original unit. The time waveform data is not convertible. In your case it will be in velocity units.
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