Maintenance
Page 9
TRB-UM-00478-EN-01
September 2018
MAINTENANCE
Bearing Replacement
Bearings should be periodically replaced due to normal, in-service wear Failure to
periodically service the bearings will result in inaccurate readings Generally, replacing
the bearing will return the meter to its original calibration However, new bearings can be
defective and rotor blade wear will also shift the calibration Therefore, turbine flow meters
should never be returned to service after a bearing change until they have been calibrated
using a primary standard flow meter calibrator
It is highly recommended to have bearing replacement performed by the factory Bearing
changes are technically simple but can become very costly and time-consuming if
performed incorrectly Additionally, bearing changes mandate recalibration in order to
maintain accuracy due to variances in bearing performance By returning the meter to the
factory, you guarantee receiving the fastest, most economical service combined with the
correct and current calibration for your application
Visual Inspection
Simple visual inspection is the only other preventive maintenance to be performed
Periodically inspect the flow meter housing for signs of damage, wear or fatigue failure
(stress cracking, specifically on flanged series) Leaks from fluid connections are important
to catch in order to maintain accuracy and to prevent contamination of the environment
Regard the flow meter as both pipe work and instrumentation when defining the
preventive maintenance schedule
The signal output system should be periodically checked while inspecting for
environmental deterioration Allowing the connectors and cabling to degrade can
adversely affect the quality of the output signal, which may cause data acquisition
system issues
The frequency of inspection and maintenance is application-specific As the environment
and application get harsher or dirtier, the frequency of inspection should be increased
Recommended Spare and Replacement Parts
Due to the calibrated nature of this instrument, it is not beneficial to maintain a stock
of spare or replacement parts If the application is critical and must not be offline for
maintenance or periodic recalibration, it is highly recommended to stock a spare calibrated
flow meter assembly
