Bell & Gossett P5002169C Series VSCS - Manual (Page 11)

9
Table 3: Angular Inch Gap
Degrees Hub
Size
1 2 3 4
WE2 0.032 0.065 0.097 0.129
WE3 0.040 0.081 0.121 0.162
WE4 0.045 0.091 0.136 0.181
WE5 0.055 0.109 0.164 0.218
WE10 0.064 0.127 0.191 0.218
WE20 0.078 0.156 0.234
WE30 0.095 0.189 0.284
WE40 0.116 0.231 0.347
WE50 0.142 0.284 0.425
WE60 0.153 0.305
WE70 0.161 0.323
WE80 0.196 0.393
Figure 10: Maximum Allowable Misalignment for Wood’s Duraflex ®1 Couplings
1 Duraflex is a registered trademark of T.B. Wood’s, Inc.
Example: A WE10 coupling with a 3° angular
misalignment will have a .191” difference in
measurements between L1 and L2. (See Figure
9.)
To align using dial indicator
Angular misalignment may be checked by
mounting the dial indicator base to one
coupling half, or shaft, and positioning the dial
indicator button on the front face or rear face
of the opposite coupling half. Scribe index
lines on coupling halves as shown in Figure
11. Set the dial to zero. Rotate both coupling
halves together, making sure the index lines
remain matched. Reposition the equipment
until the offset is within the permissible value.
Parallel misalignment may be checked by
mounting the dial indicator base to one
coupling half, or shaft, and positioning the dial
indicator button on the outside diameter of
the opposite coupling half. Set the dial to
zero. Rotate both coupling halves together,
making sure the index lines remain matched.
Reposition the equipment until the offset is
within the permissible value.
Figure 11: Checking Alignment with
Dial Indicators
6. Recheck the hubs to be certain both
angular and parallel alignments are still
within the values given in Figure 10.
7. Loosen the set screw on the pump hub.
Loosely install one half element opposite
the hub set screws. Torque both hub set
screws to the value shown in Table 4. For
QD or Taper-Lock hubs, follow the
instructions supplied with the bushings.
Loosely install the other half element onto
the hubs. Install capscrews on the high-
speed rings. If the capscrews and the
holes in the elements do not line up