Goulds Pumps API 3171 - IOM - Manual (Page 15)

Bearings
The thrust bearing is grease- or oil-mist-lubricated and consists of a pair of single-row, angular contact ball
bearings arranged back-to back. The bearing is shouldered and locked to the shaft and housing. This
enables the bearing to carry all of the thrust loads and some of the radial load. All fits are precision-
machined to industry standards. The steady bearings are press fit sleeve bearings. Fits are designed for
optimum life under all operating conditions.
Seals
This pump has three seals:
Seal type Description
Upper labyrinth seal This seal is used to exclude dirt and water from the thrust
bearing.
Lower labyrinth seal This seal is used below the thrust bearing in order to contain the
grease and exclude any possible contamination.
Carbon Teflon ® casing collar This seal is installed immediately behind the impeller in the casing
in order to minimize recirculation back to the sump and
maximize hydraulic efficiency.
Motor support
Motor supports are cast construction and precision-machined in order to maintain proper alignment
between the motor and pump shaft with minimal shimming. Motor supports are designed for vertical C-
face motors as standard. P-base supports and IEC adapters are available upon request.
Direction of rotation
The shaft rotates clockwise when you look down on the pump shaft.
Enclosed lineshaft
The enclosed lineshaft design lends itself well for applications where abrasives are present in the pumped
fluid, or when a bearing lubricant other than the pumped fluid is required.
Lubrication system
CAUTION:
The fluid must run continuously to ensure flow out of the column at all times. If the flush stops, the fluid
in the sump can back up into the column. This contaminates the bearings.
The main feature of this modified design is a positive lubrication system for all bearings. This design
requires a minimum of lubrication fluid due to the bushing located at the bottom of the column adapter
housing directly above the impeller.
Acceptable leak rates
Leaks (flows) across the bushing for certain pressure differentials are shown in this table. Higher pressures
will result in higher leaks.
Pressure differential (PSI) Approximate leak rate (GPM)
3.0 0.33
5.0 0.44
7.5 0.60
Standard materials of construction
• Floating bushings are 18-8 stainless steel housing and spring with a glass-filled Teflon bushing.
• Flush tubing is steel.
Drawing
Positive flow must be maintained at all times.
Product Description
Model API 3171 Installation, Operation, and Maintenance Manual 13