Goulds Pumps 3196 i-FRAME - IOM - Manual (Page 66)

Maintenance
Bearing temperature
Bearing temperatures are generally about 20°F (18°C) greater than bearing-housing outer surface
temperatures.
This table shows the type of grease required for the operating temperature of the pump.
Bearing temperature Type of grease
5°F to 230°F (-15°C to 110°C) Use a lithium-based mineral-oil grease with a con-
sistency of NLGI 2.
Exceed 350°F (177°C) Use a high-temperature grease. Mineral-oil greases
should have oxidation stabilizers and a consistency
of NGLI 3.
Grease recommendations based on temperature
Most pumps use Sunoco 2EP grease. High temperature units that can pump fluids with a temperature
greater than 350°F (177°C) use Mobil SCH32.
This table shows which brand of grease to use when lubricating the pump.
Brand When temperature of pumped When temperature of pumped
fluid is less than 350°F fluid is greater than350°F
(177°C) – NLGI consistency 2 (177°C) – NLGI consistency 3
Mobil Mobilux EP2 SCH32
Exxon Unirex N2 Unirex N3
Sunoco Mutipurpose 2EP N/A
SKF LGMT 2 LGMT 3
Lubricate the bearings after a shutdown period
1. Flush out the bearings and bearing frame with a light oil to remove contaminants.
During flushing, make sure to rotate the shaft slowly by hand.
2. Flush the bearing housing with the proper lubricating oil to ensure oil quality after cleaning.
Shaft seal maintenance
Mechanical-seal maintenance
WARNING:
The mechanical seal used in an Ex-classified environment must be properly certified. Prior to startup,
make sure that all areas that could leak pumped fluid to the work environment are closed.
CAUTION:
Never operate the pump without liquid supplied to mechanical seal. If you run a mechanical seal dry,
even for a few seconds, this can cause seal damage. Physical injury can occur if a mechanical seal fails.
Reference drawing
The manufacturer supplies a reference drawing with the data package. Keep this drawing for
future use when you perform maintenance and seal adjustments. The seal drawing specifies
the required flush fluid and attachment points.
Before you start the pump
Check the seal and all flush piping.
Mechanical seal life
The life of a mechanical seal depends on the cleanliness of the pumped fluid. Due to the
diversity of operating conditions, it is not possible to give definite indications as to the life of a
mechanical seal.
64 Model 3196 i-FRAME Installation, Operation, and Maintenance Manual