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WARNING:
The impeller clearance setting procedure must be followed. Improperly setting the clearance or
not following any of the proper procedures can result in sparks, unexpected heat generation,
and equipment damage.
WARNING:
•
The pump should be run for a period of 15 minutes to verify the impeller is properly tight-
ened onto the shaft. In addition to verifying the impeller is properly tightened, it is neces-
sary to verify that the bearing frame adjustment plate bolts (352G) and nuts (427D) are
properly secured and tight. Failure to check that the impeller is tight and the bearing
frame adjustment plate bolts and nuts are properly tightened can result in the rotating ele-
ment shifting during operation.
415A 370X
234F 352G 427G
Figure 28: Securing the bearing frame adjustment plate
•
Risk of mechanical seal damage leading to breach of containment. If a cartridge mechani-
cal seal is used, ensure that the set screws in the seal locking ring are loosened and that
the centering clips have been installed prior to clearance adjustment.
The front clearance is set at .51 mm (0.020 in) at the factory but could change due to piping attachment
during installation. A change in pump performance may be noted over time by a drop in head or flow or
an increase in power required.
Table 8: Impeller clearance methods
The XHD and XHD Value Option models have different methods of setting the impeller clearance.
Pump Model
Method
XHD
The impeller clearance is set by measuring the gap between the rear shroud of the impeller
and the casing volute liner, and measuring the gap between the front of the impeller and the
suction seal ring clearance.
Skip to the "Set Impeller to Suction seal Ring Clearance Dial Indicator Method - XHD" step.
After impeller rear clearance has been set on the XHD, the suction seal ring clearance must
also be set.
XHD Value Option
The impeller clearance is set by measuring the gap between the front of the impeller and the
suction side liner. Use the "Set the impeller clearance dial indicator method - XHD Value Op-
tion" step. All units that do not have the Adjustable Suction Seal Ring as part of the assem-
bly are set via this method.
5.6 Impeller-clearance setting
XHD Installation, Operation, and Maintenance Manual
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Summary of Contents for XHD
Page 1: ...Installation Operation and Maintenance Manual XHD ...
Page 2: ......