Document P/N:
2P121260
Release Date: 02/27/2017
Revision: E
16 of 41
Recommended Plunger Lube Oils:
Selecting the proper plunger lube oil is very important to obtaining long life from the pumps plungers and
packing assemblies. The use of a superior plunger lubricant will also reduce horsepower robbing friction,
reduce fuel consumption, and increase the net amount of hydraulic horsepower delivered by the pump. Weir
Oil & Gas highly recommends the use of a modern “Rock Drill” for improved lubrication of the plungers and
packing. If “Rock Drill” is not available, a suitable “Way Oil” may be substituted.
Weir Oil & Gas recommends the use of Rock Drill or Way Oil that meet the following specifications:
ISO Grade
68 100
API Gravity 29.4 28.2
Viscosity, Kinematics
cSt at 40°C 70 104
cSt at 100°C 9 12
Viscosity, Saybolt
SUS at 100°F 362 556
Viscosity Index 103 99
Flash Point, C(F) 248 (478) 254 (489)
Pour Point, C(F) -27 (-17) -24(-11)
The following types of plunger lube Rock Drill oil are recommended for use in various ambient conditions as
shown:
General Service – for ambient conditions above 32 degrees F:
“Rock Drill 100” or equivalent
Cold Temperature Service – for ambient conditions below 32 degrees F:
“Rock Drill 68” or equivalent
NOTE: LUBRICANTS WHICH DIFFER SIGNIFICANTLY FROM THOSE SHOWN ABOVE ARE
UNACCEPTABLE AND MAY RESULT IN A MUCH SHORTER PLUNGER AND PACKING LIFE OR
PREMATURE FAILURE OF THESE COMPONENTS.
NOTE: STARTUP IS A CRITICAL TIME FOR PLUNGER PACKING. LUBRICATION SHOULD FLOW FREELY
TO PLUNGERS/PACKING PRIOR TO STROKING THE PUMP. STROKING DRY PLUNGERS CAN CAUSE
THE HEADER RING, PACKING, AND ELASTOMERS TO TEAR AND FAIL.
NOTE: PROPER LUBRICATION IS CRITICAL TO DURING THE STARTUP OF THE PLUNGER PUMP. THE
PLUNGER LUBRICANT MUST BEGIN TO FLOW FREELY TO THE STUFFING BOX LUBE INLET PRIOR TO
THE PUMP’S STARTUP AND STROKING OF THE PLUNGERS.
CAUTION: PUMPS WHICH HAVE SAT IDLE FOR ANY APPRECIABLE PERIOD OF TIME (TWO WEEKS OR
MORE) MUST HAVE THE PLUNGERS REMOVED, BE HAND COATED WITH PLUNGER LUBE OIL, AND
REINSTALLED PRIOR TO OPERATION UNDER POWER. THE ELASTOMERIC PACKING RINGS WILL
EVENTUALLY STICK TO THE PLUNGER SURFACE AND WILL BECOME DAMAGED UPON STARTUP IF
NOT RE-LUBRICATED AS NOTED ABOVE.
To Next Page
Loading...
Need help?
General
