Inspecting And Adjusting The Impeller Clearance - Grundfos SE Serie Instrucciones De Instalación Y Operación

10.2 Inspecting and adjusting the impeller clearance

For pumps with the closed S-tube
is the distance between the bottom of the impeller and stationary
wear ring.
For pumps fitted with the open S-tube
the distance between the bottom of the impeller and the suction
cover.
Pressure version
S = Super-high pressure
H = High pressure
M = Medium pressure
L = Low pressure, two-channel S-tube
L = Low pressure, single-channel S-tube
E = Extra-low pressure, two-channel S-tube
E = Extra-low pressure, single-channel S-tube
Clearance sizes for open S-tube® impellers
Pressure version
S = Super-high pressure
H = High pressure
DANGER
Electric shock
Death or serious personal injury
‐
Before starting any work on the product, make sure
that the power supply is switched off and that it cannot
be switched on unintentionally.
The impeller clearance of installation types S and C can
be inspected directly through the pump inlet.
The impeller clearance of installation types D and H can
be inspected and adjusted with the pump installed on the
base stand and connected to the pipes.
22
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impeller, the impeller clearance
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, the impeller clearance is
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The correct impeller clearance is required to maintain the pump's
hydraulic performance and to prevent clogging.
Check the impeller clearance every time service is carried
out to prevent hot surfaces in the hydraulic parts.
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Clearance sizes for closed S-tube impellers
Impeller clearance X
[in (mm)]
0.019 ± 0.004 (0.5 ± 0.1)
0.023 ± 0.004 (0.6 ± 0.1)
0.023 ± 0.004 (0.6 ± 0.1)
0.027 ± 0.004 (0.7 ± 0.1)
0.035 ± 0.004 (0.9 ± 0.1)
0.027 ± 0.004 (0.7 ± 0.1)
0.035 ± 0.004 (0.9 ± 0.1)
Impeller clearance X
[in (mm)]
0.019 ± 0.004 (0.5 ± 0.1)
0.023 ± 0.004 (0.6 ± 0.1)
Turning Angle of Set Screw
(degrees)
170 °
140 °
170 °
140 °
125 °
125 °
110 °
Turning Angle of Set Screw
(degrees)
110 °
110 °