Flowserve QLQ Vertical Worthington - Manual (Page 34)

QLQ, QLQC USER INSTRUCTIONS ENGLISH 87900027 – 06/14
Page 34 of 61
5.3 Lubrication of thrust bearing
If the thrust bearing is installed in the pump, it must
be supplied properly with lubricant oil.
5.3.1 Grade of Oil
Oil for lubricating ball or roller should be a high
quality, well refined mineral oil preferably of the
turbine type. Vegetable or animal oils should not be
used as they tend to become rancid and will
eventually corrode the bearing surface.
Oil should conform to specification ISO VG46. The
following suppliers grade are suitable.
Oil Manufacturer Trade name of the oil
AGIP OTE 46
BP Oil Ltd Energol THB 46 or CS 46
CASTROL Perfecto T46
CHEVRON DC Turbine Oil 46
ESSO Teresso 46 or Nuto H46
GULF Harmony 46
MOBIL DTE Light
SHELL Turbo T46
TEXACO Regal Oil R&O 46
5.3.2 Oil Filling
a) Drain the bearing bracket and flush it with a light
oil. Install the constant level oiler.
b) Make sure the oiler is set at proper level.
c) Fill the bottle through the stem, replace and allow
oil to flow into reservoir. It may be necessary to
fill the bottle several times before the oil ceases
to run into the reservoir, indicating that the oil is
up to the proper level.
d) Refill the bottle to maintain this level.
Never fill the reservoir through the air
vent opening.
5.3.3 Constant Level Oil Control
The constant level oil control maintains a constant
level of oil in the reservoir. The control feeds only
enough oil to maintain the required level. It operates
on the liquid seal principle, feeding only when the
level in the reservoir is low enough to break the liquid
seal at the end of the shank, thus permitting air to
enter the bottle. It will cease to feed when there is
sufficient oil in the reservoir to cover the hole in the
end of the shank.
Constant level oiler
5.3.4 Bearing Oil Temperature
Circulation of the oil in the reservoir is achieved by
centrifugation. It is recommended that the lubricating
oil is kept between 38°C and 75°C (100°F-167°F),
preferably above 49°C (120 °F).
The bearing oil temperature without cooling may rise
to 82°C (180 °F).
5.3.5 Oil Change
Operating conditions and severity of service will
determine the interval between oil changes. In
general higher oil temperature will require more
frequent oil change. If the bearings maintain their
normal temperature and there has been no
contamination of the oil, the interval between
changes may be prolonged.
Generally the oil should be changed every six
months. If the bearing temperature increases, check
immediately improper lubrication or a faulty bearing.
5.4 Impeller adjustment
Proper impeller adjustment is needed to place the
impeller inside the bowl assembly in the best position
to maximize performance. If the impeller position is not
fitted, a reduction in performances shall occur, and , in
the worst cases, impeller and casing damages by the
contact between casing and impeller.
5.4.1 Impeller adjustment of a pump with solid
shaft driver
During pump assembly in factory, the pump shaft is
axially positioned by the adjusting nut so that the
impeller is centered in the correct position.
Check after the installation and regulate the position
of the impeller, even if the pump has been installed
completely assembled.