If your impeller is an...
Then...
record the gap between the adjust plate and the driver hub flange
faces.
4.
Calculate the difference between the two gaps recorded above. To
this difference add the specified impeller lift value from the pump
general arrangement drawing or from the pump nameplate. Record
the calculated sum.
5.
Loosen and remove the coupling bolting. Turn the adjusting plate
until the measured gap between the flange faces of the adjusting
plate and the driver hub is equal to the calculated sum above.
6.
Install the coupling bolts and tighten in a star pattern to draw the
flanges together. Prestress the bolts in three stages to the final tor-
que value provided on the pump assembly drawing.
7.
Set the shaft packing or the mechanical seal.
Enclosed impeller
1.
Obtain the impeller setting from the Certified Pump Outline Drawing.
2.
Align the adjusting plate with the pump hub, and tightly draw the
coupling flanges together with capscrews and nuts.
3.
Set the seal:
1.
Securely tighten all setscrews in the collar.
2.
Remove the spacer between the gland plate and the collar.
3.
Retain the spacer for future resetting of the seal.
4.10.4 Adjust the impeller for a hollow-shaft driver
NOTICE:
•
If your hollow-shaft driver has a mechanical seal, you must disengage the mechanical
seal prior to impeller adjustment.
•
Improper impeller adjustment can cause contact between the rotating and stationary
parts. This may result in sparks and heat generation.
This procedure applies to the open and enclosed impeller:
1.
Make sure that the shafting is all the way down and that the impellers are resting on their seats.
2.
Turn the adjusting nut in a counterclockwise direction in order to lift the shaft until the impellers just
clear their seats and the shaft turns freely by hand.
This removes all deflection from the shaft.
3.
Align hole A in the adjusting nut and hole C in the motor coupling.
If you are careful, you can reach an initial impeller clearance between 0.02 mm to 0.07 mm | 0.001
in. to 0.003 in. depending on the shaft size and thread data shown in this table:
4.10 Install a solid-shaft driver
Model VCW Installation, Operation, and Maintenance
41
Summary of Contents for Goulds Pumps VCW
Page 1: ...Installation Operation and Maintenance Model VCW ...
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