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A VALIDATION For example we observe that the axial float reached to a
value of 0.30 mm within one year of last overhauling in
The measurement of the ‘thrust float’ was carried out Dec-2020. As per conventional practice it was supposed
during two subsequent inspections – one using the to be inspected in 2022 again during overhauling, but
traditional method of mechanical float measurement the axial float by then would have reached well beyond
using dial gauge and the other using a multimeter to desired values as per prevailing trend. Hence during
read from the probe output. The data were found to scheduled outage of Boiler in 2021 we planned for an
be validating each other in respect to the measured early inspection and rectified the drift to its design value
readings. The table below illustrates the readings taken again thus saving the MOP from any undesired damages
during subsequent inspections. and was able to maintain uncompromised reliability of
such critical asset. A future provision is to connect this
Table 2: Measured Float (mm) measurement to DCS to obtain real time trends.
With Probe Mechanical
Inspection Time ABBREVIATION
0.15 0.18
Dec-2020 0.30 0.33 BBGS: Budge Budge Generating Station
Dec-2021(Drift observed) 0.16 0.18 BHEL: Bharat Heavy Electricals Limited
Dec-2021(Drift corrected) KWU: Kraftwerk Union
MOP: Main Oil Pump
The Axial shift drift (increase) is evident form the above DCS: Distributed Control System
data where both measurements corroborate each other. JB: Junction Box
Thus, monitoring this value will preempt any un-planned
shutdown incase the drift (increase) goes beyond ACKNOWLEDGEMENT
recommended limits so as to result in failure of the
lubrication system. I would like to express my sincere gratitude to Mr. Snehasis
Samaddar, VP Generation OS; Mr. Asim Kr. Ray, GM, CTM
BENEFITS & FUTURE ROADMAP Dept.; Mr. Sibir Roy GM BBGS; Mr. Susovan Narayan
Choudhury DGM BBGS for their constant guidance and
This installation is first of its kind in a 250 MW KWU machine encouragement for sound conclusion of this project.
design. The ability to now monitor the MOP axial shift
online gives us a breathing space in terms of reliability.
66
value of 0.30 mm within one year of last overhauling in
The measurement of the ‘thrust float’ was carried out Dec-2020. As per conventional practice it was supposed
during two subsequent inspections – one using the to be inspected in 2022 again during overhauling, but
traditional method of mechanical float measurement the axial float by then would have reached well beyond
using dial gauge and the other using a multimeter to desired values as per prevailing trend. Hence during
read from the probe output. The data were found to scheduled outage of Boiler in 2021 we planned for an
be validating each other in respect to the measured early inspection and rectified the drift to its design value
readings. The table below illustrates the readings taken again thus saving the MOP from any undesired damages
during subsequent inspections. and was able to maintain uncompromised reliability of
such critical asset. A future provision is to connect this
Table 2: Measured Float (mm) measurement to DCS to obtain real time trends.
With Probe Mechanical
Inspection Time ABBREVIATION
0.15 0.18
Dec-2020 0.30 0.33 BBGS: Budge Budge Generating Station
Dec-2021(Drift observed) 0.16 0.18 BHEL: Bharat Heavy Electricals Limited
Dec-2021(Drift corrected) KWU: Kraftwerk Union
MOP: Main Oil Pump
The Axial shift drift (increase) is evident form the above DCS: Distributed Control System
data where both measurements corroborate each other. JB: Junction Box
Thus, monitoring this value will preempt any un-planned
shutdown incase the drift (increase) goes beyond ACKNOWLEDGEMENT
recommended limits so as to result in failure of the
lubrication system. I would like to express my sincere gratitude to Mr. Snehasis
Samaddar, VP Generation OS; Mr. Asim Kr. Ray, GM, CTM
BENEFITS & FUTURE ROADMAP Dept.; Mr. Sibir Roy GM BBGS; Mr. Susovan Narayan
Choudhury DGM BBGS for their constant guidance and
This installation is first of its kind in a 250 MW KWU machine encouragement for sound conclusion of this project.
design. The ability to now monitor the MOP axial shift
online gives us a breathing space in terms of reliability.
66
