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1. All 3 BFPs higher shaft vibration is observed about (70 to 80 micron) at the Pump Drive end bearing (both X-Y), but all other bearing point vibrations are in normal range below 30 micron.
2. When all the 3 pumps were running at same speed, similar pattern of vibration reading at the point is noted.
3. Pump suction parameters are also observed but found to be as per design and normal, suction parameters are also changed (Suction pressure 1.4kg/cm2 to 1.8 kg/cm2) to check whether it causes any difference to the vibration at these points. But no variation to the readings is noted.
4. These higher vibration pattern is observed during last 7 days operation, previously the readings on load for the same points were higher than the other points but it was within 40 micron (PP).
5. In pump stand still condition also it is observed that at those points vibration reading of (4-6 micron is observed).
6. All vibration sensors are checked for healthiness by calibration with TK3, also to rule out probability of sensor linearity, sensors/module/cable at those points are altered with other locations. But the same reading at these points were persisting irrespective of sensor/module/cable.
7. For further analysis we arranged analysis group to take readings at different points. At the point of our observation (Pump Driving End) casing vibration in running condition is found as approx. 1.6 mm/sec (RMS).
Please advice for the reason of high vibration.
Regards
Sanjib
email:[email protected]
2. When all the 3 pumps were running at same speed, similar pattern of vibration reading at the point is noted.
3. Pump suction parameters are also observed but found to be as per design and normal, suction parameters are also changed (Suction pressure 1.4kg/cm2 to 1.8 kg/cm2) to check whether it causes any difference to the vibration at these points. But no variation to the readings is noted.
4. These higher vibration pattern is observed during last 7 days operation, previously the readings on load for the same points were higher than the other points but it was within 40 micron (PP).
5. In pump stand still condition also it is observed that at those points vibration reading of (4-6 micron is observed).
6. All vibration sensors are checked for healthiness by calibration with TK3, also to rule out probability of sensor linearity, sensors/module/cable at those points are altered with other locations. But the same reading at these points were persisting irrespective of sensor/module/cable.
7. For further analysis we arranged analysis group to take readings at different points. At the point of our observation (Pump Driving End) casing vibration in running condition is found as approx. 1.6 mm/sec (RMS).
Please advice for the reason of high vibration.
Regards
Sanjib
email:[email protected]