4 Liquid End
4.1 General Instructions
The impeller of the HS pump is recessed in a circular opening at the back of the casing. The uniform
running clearance between the impeller and the casing keeps a uniform pressure around the outside of
the impeller, and the resulting hydraulic forces on the impeller are low compared to the conventional cen-
trifugal pump.
The bearing loads and deflection through the stuffing box are reduced with the HS configuration. The im-
peller is fitted with back vanes to reduce to axial pressure unbalance and the resulting loads on the thrust
bearings.
The HS pump is designed to pass any solid which can enter through the suction opening, provided the
solid is not significantly longer that it is wide. Most of the solids do not flow through the impeller passage-
ways.
Figure 13: Liquid End
4.2 Clearance Adjustment
The HS impeller should have approximately 1/8” running clearance for the back vanes on the stuffing box
side of the impeller. The standard HS bearing assemblies are machined to provide the proper clearance
without any adjustment features.
4.3 Disassemble the Liquid End
1.
Drain all liquid from the pipe line. Remove the discharge flange bolts and the suction pipe.
2.
Remove the cap screws which fasten the casing (100) to the SB Cover (184). Carefully slide the
casting away, making sure it does not drop down onto the impeller after it has cleared the fit in the
SB Cover flange.
3.
Remove the impeller.
4 Liquid End
20
Model HS Installation, Operation, and Maintenance Manual
Summary of Contents for Goulds Pumps HS
Page 1: ...Installation Operation and Maintenance Manual Model HS ...
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