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Noknroll

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Anyone monitoring these pumps in a fuel oil to boiler application?
Mine are showing fluctuating levels from 19 g's up to 39 g's in peakvue and normal acceleration waveforms.
these pumps (4 of them) are around 30 years old. Just wondering if others see these sort of figures or am I sitting on an aging time bomb?

RGf

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I had a similar experience with a fuel oil pump in combustion turbine service. It wasn't a Plenty pump but was a 3 screw pump of similar construction and operation. I never figured it out but if my memory serves me correctly according to the OEM the relief valve was periodically hanging up due to fuel oil residue buildup. I will see if I still have the rebuild/testing report but it was quite a while back. I could never get straight in my head how this could give me the fluctuations in vibration but I went with it. I remember going into monitor mode on a 2130 and watching the amplitudes fluctuate at a pretty steady time period.
fburgos

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I have 3 of them, and im afraid to take measurements ussually vibration ranges from 8 to 20mm/s... these are not in my monitoring routine, I'll try to get new data havent measure them in long time.
Noknroll

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Thanks Fellas
RGF
my operators have 2 methods of test running for vibration data collection.
1. is to run in a closed loop where a lot of pressure goes over the relief valve
2. is to bring in a burner nozzle where some goes over the relief V/V.

2. usually runs a bit "quieter" but not always?

fburgos
my velocity measurement in the same location as the high acceleration is <1mm/sec on all 4 pumps......yours sound a bit scary at 8 - 20 mm/sec

would be good if you can get acceleration data to compare
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