5.6
Lubrication Attachment Points
See
Section 4
for drawings showing lubrication inlet and outlet locations.
5.7
Fluid End Plunger and Packing Lubrication Requirements
It is essential for the effectiveness and life of the plunger packing to provide sufficient lubrication to the fluid
end plungers and stuffing box. Failure to do so may result in short packing life, plunger damage, and costly
down time. Typical fluid end plunger lubrications systems utilize either an air over oil pneumatic or positive
displacement grease system. Either lubricating method is acceptable as long as the following guidelines are
heeded.
The lubricant should be suitable for the entire operating temperature range of the well service pump, resist
water, inhibit corrosion, and provide wear protection. Oils used for plunger lubrication will typically have a
viscosity index of about 95, and greases will be NLGI grade 0 to 2; depending on the application.
Consult MSI Engineering if assistance is required in selecting a lubricant.
5.8
Oil Change and Oil Types
MSI recommends that oil condition be monitored, and samples should be tested by a certified laboratory to
determine the optimum frequency for oil changes. Laboratory testing can also aid in identifying pump
damaging particles that may originate from unsuspected sources such as low quality lubricants or filters.
Consult MSI Engineering if assistance is required in selecting a lubricant.
To keep the warranty in effect, use an oil that contains an “extreme pressure” (EP) additive that meets or
exceeds U.S.MIL-SPEC Mil-L-210B and that has Timken Test rating no lower than 45 lbs.
For general service use:
SAE 90 automotive grade gear oil with EP additive is recommended for ambient temperatures ranging from
20°F to 90°F. These oils have a pour point of approximately 0°F and a viscosity rating of 85 SUS or more at
210°F. The plunger pump’s oil temperature must not exceed 175°F when using one of these oils.
For cold service use:
SAE 80 automotive grade gear oil with EP additive or an AGMA #3EP industrial grade is recommended where
ambient temperatures range from –25°F to 70°F. These oils have a pour point of approximately –25°F and a
viscosity rating of 55 SUS at 210°F. The plunger pump’s oil temperature must not exceed 130°F when using
one of these oils.
For high temperature service use:
SAE 140 automotive grade gear oil with EP additive or an AGMA #7 EP industrial grade is recommended
where ambient temperatures range from 35°F to 110°F. These oils have a pour point of approximately 20°F and
a viscosity rating of 140 SUS at 210°F. The plunger pump’s oil temperature must not exceed 195°F when using
one of these high temperature service oils.
Revision K 03/12/2019
MSI - A Division of Dixie Iron Works, Ltd. All rights reserved.
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