VIBRATION METER PROBE POSITIONS
For Arrangement 4D Blowers
B. Vibration:
The blower was balanced at the factory to comply with ANSI/AMCA Standard 204-05, Category BV-2. However, rough
handling in shipment and/or erection, weak and/or non-rigid foundations, and misalignment may cause a vibration prob-
lem after installation. After installation, the vibration levels should be checked by personnel experienced with vibration
analysis and vibration analysis equipment.
NOTE:
The blower SHOULD NOT be operated if the vibration velocity of the fan exceeds 0.50 inches per second, filter
out, if the blower is rigidly mounted. If the blower is mounted on isolators or on an isolator base, it SHOULD
NOT be operated if the vibration velocity of the blower exceeds 0.75 inches per second, filter out.
Vibration readings for direct driven blowers should be taken on the motor at the top, sides and end as per
Fig. 3
below.
After you have taken your vibration readings, write them down in the spaces below and keep for future comparison.
OMM-23-1009-page 8
If the blower is going to be conveying material, it is the users responsibility to periodically turn the blower off and
lock out the power. The blower wheel should then be checked for material build-up and/or erosion. If material has
built up on any parts of the wheel, it MUST be removed and cleaned before it is put back into service. If any parts
of the wheel have been eroded, the wheel MUST be replaced. Failure to perform this inspection can cause
excessive vibration that will damage the blower and/or motor bearings. When vibration becomes excessive, it will
lead to complete blower failure that could cause property damage, severe personal injury and death. The user
must determine the frequency of this inspection based on the actual circumstances of their operation, BUT
checking the vibration readings should NEVER exceed a 12 month period. For the AMCA/ANSI standard for
vibration limits, see Fig. 4 on page 9.
DANGER
Fig. 3
