5.5 Impeller-clearance check
The impeller-clearance check ensures the following:
•
The pump turns freely.
•
The pump operates at optimal efficiency for long equipment life and low energy consumption.
5.5.1 Impeller axial clearances
Total axial adjustment
NOTICE:
Service temperature in an ATEX classified environment is limited to the area classi-
fication specified on the ATEX tag to the pump.
(refer to ATEX classifications)
1.3 Product approval standards on page 12
.
The total axial adjustment of the impeller between the suction seal ring and the stuffing box cover should
be as noted in the chart below.
Impeller clearance (total travel)
Pump size
Impeller Maximum Total Clearance
inches (mm)
Impeller Minimum Total Clearance
inches (mm)
XHD50
0.37 (9.4)
0.10 (2.6)
XHD75
0.37 (9.4)
0.10 (2.6)
XHD80
0.37 (9.4)
0.10 (2.6)
XHD100
0.39 (9.8)
0.10 (2.6)
XHD125
0.39 (9.8)
0.10 (2.6)
XHD150
0.43 (10.8)
0.13 (3.3)
XHD200
0.47 (11.8)
0.16 (4.1)
XHD250
0.47 (11.9)
0.16 (4.0)
XHD300
0.51 (12.8)
0.18 (4.6)
5.6 Impeller-clearance setting
Importance of a proper impeller clearance
A proper impeller clearance ensures that the pump runs at high performance.
NOTICE:
Set the cold (ambient) impeller clearance according to
Table 9: Impeller clearance - Metal-lined
Table 10: Impeller clearance - Rubber-lined on page 54
ting impeller back clearance with an expeller - Metal-lined assemblies on page 54
. Failure to
do so may result in heat generation and equipment damage. Higher clearances are used
above 93°C | 200°F to prevent the impeller from contacting the casing due to thermal expan-
sion.
5.5 Impeller-clearance check
50
XHD Installation, Operation, and Maintenance Manual
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