Twin City Tubeaxial, Vaneaxial, & Duct Fans ES-191 - Manual (Page 3)

Twin City Engineering Supplement ES-191 3
Observation of the condition of the grease expelled
from the bearings at the time of relubrication is the best
guide as to whether regreasing intervals and the amount
of grease added should be altered.
Greases are made with different bases. There are
synthetic base greases, lithium base, sodium base, etc.
Avoid mixing greases with different bases. They could
be incompatible and result in rapid deterioration or
breakdown of the grease.
All bearings are filled with a lithium based grease
before leaving the factory. When the fans are started,
the bearings may discharge excess grease through the
seals for a short period of time. Do not replace the initial
discharge because leakage will cease when the excess
grease has worked out. Bearings have a tendency to
run hotter during this period and should not be a cause
for alarm unless it lasts over 48 hours or gets very hot.
When relubricating, use a sufficient amount of grease
to purge the seals. Rotate bearings during relubrication
where good safety practice permits.
Propeller and Shaft Maintenance
The buildup of material on axial flow propellers can
adversely affect fan performance. While fans that handle
clean, fresh air seldom need cleaning, occasionally
check fans used for industrial purposes for material
buildup on the propeller. This material can come off
in large chunks, throwing the propeller out of balance.
Clean the propeller and, on vaneaxial fans, the turning
vanes; when appropriate, apply new coatings.
If the propeller is removed for any reason, make sure
that it is securely attached to the shaft before restart-
ing the fan. If the propeller is attached to the shaft by
means of a Trantorque ® bushing, use the tightening
torque values shown in Table 1.
Table 1.
Structural Maintenance
All structural components or devices used to support or
attach the fan to a structure should be checked at regu-
lar intervals. Vibration isolators, bolts, foundations, etc.,
are subject to failure from corrosion, erosion, and other
causes. Improper mounting can lead to poor operation
characteristics or fan fatigue and failure.
Check metallic components for corrosion, cracks, or
other signs of stress. Concrete should be checked to
insure the structural integrity of the foundation.
Figure 4. Horizontal Mounting Arrangements
Operation Checklist
Verify that proper safety precautions have been followed:
□ Electrical power must be locked off.
Check fan mechanism components:
□ Nuts, bolts and setscrews are tight.
□ Mounting connections are properly made and
tightened.
□ Bearings are properly lubricated.
□ Propeller, drive and fan surfaces are clean and free
of debris.
□ Rotating assembly turns freely and does not rub.
□ Sheaves are on the correct shafts, properly aligned
and properly tensioned.
Check fan electrical components:
□ Motor is wired for proper supply voltage.
□ Motor size is sufficient to power the rotating assembly.
□ Motor is properly grounded.
□ All leads are properly insulated.
Trial “bump”:
□ Turn on power just long enough to start assembly
rotating.
□ Check rotation for agreement with rotation arrow.
□ Listen for any unusual noise.
Run unit up to speed:
□ Bearing temperatures <180°F are acceptable after one
to two hours of operation.
After one week of operation:
□ Check all nuts, bolts and setscrews and tighten if
necessary.
□ Readjust drive tension if necessary.
Support
Rods
Suspension
Clips
2 Support
Legs
4 Nuts &
Washers
4 Anchor
Bolts
Fan
Support Rods
Horizontal With
Suspension Clips
Horizontal With
Support Legs
Duct Supported
Installation
TRANTORQUE ® SHAFT SOCKET TORQUE TORQUE
SIZE DIA. SIZE (IN. LBS.) (FT. LBS.)
7 ⁄
8 7 ⁄
8
1 1 ⁄
2
850 71
1 1 ⁄
8 1 1 ⁄ 8 1 3 ⁄ 4 1550 130
1 3 ⁄
8
1 3 ⁄
8
2 1700 141
1 5 ⁄ 8 1 5 ⁄ 8 2 1 ⁄ 4 2800 233
1 7 ⁄
8
1 7 ⁄
8
2 1 ⁄
2
3900 325
2 1 ⁄ 8 2 1 ⁄
8
2 3 ⁄
4
5300 440
2 3 ⁄
8 2 3 ⁄ 8 3 5600 470
2 7 ⁄
8
2 7 ⁄
8
3 1 ⁄
2
6600 550
Note: These torque values are to be obtained with a calibrated torque
wrench. DO NOT apply any lubricant to any part of the Trantorque ®
hub. DO NOT use an anaerobic thread adhesive such as Loctite ® on
the threads.