Flowserve MNV - Manual (Page 34)

MNV & MNZ USER INSTRUCTIONS ENGLISH 71569188 11/04
Page 34 of 47
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Check that the sleeve is free of pits, burrs or sharp
edges to prevent cutting or improper sealing of the
rotating O-rings.
6.1.9.3 Installing the seal
Refer to the manufacturer's instructions for seal
installation.
6.1.9.4 Before starting the unit.
Check and make certain that the gland flushing line)
is clean (and also, return line if it is a double seal,
open and free of any obstruction that may interfere
with circulation of clear flushing liquid for the seal.
Before start up bleed all air from the seal cavity. This
is necessary to ensure a clean liquid environment for
effective seal operation
6.1.10 Re-lubrication
Lubricant and bearing temperature analysis can be
useful in optimizing lubricant change intervals. In
general the following is recommended.
6.1.10.1 Oil lubrication
Maintaining the correct oil level is very
important. If a sight glass has been fitted then
regular checks should be made to ensure the level is
maintained at the center of the glass window.
Refer to section 5. for methods of oil fill, oil grade
recommendations and for the schedule and
temperature limits.
6.1.10.2 Grease lubrication
See section 5.2.5 for grease
recommendations. Re-grease via grease nipples
depending on the severity of the application.
a) It is important not to under or over grease the
bearings as this will lead to over heating and
premature failure. Grease lubricated bearing
housings have grease nipples fitted in the
bearing covers.
b) Connect grease gun to the nipple.
c) Press grease into the bearing housing until the
first signs of it appear in the gap between the
housing and shaft, then stop greasing.
d) The maximum allowable operating temperatures
for anti friction bearings will vary from unit to unit,
depending on ambient and fluid temperature.
The rise above ambient should not normally
exceed 55 ° C (131 ° F) or a combined maximum
of 95 ° C (204 ° F).
e) A continuously rising temperature or an abrupt
temperature rise indicates a problem. If these
symptoms occur, stop the pump immediately and
investigate the cause.
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6.1.10.3 Grease change
if Kerosene is used to clean the
bearings make sure that the required safety
measures are to be in place while handling this liquid
fuel for cleaning (See Fuel supplier/ manufacturer’s
Material Safety Data Sheets for provided flash and
flame temperatures).
a) Remove the bearing housing from the rotor
assembly.
b) Brush the bearing housing with hot oil (at about
94 o to 115 o C (200 o to 240 o F) or other non-toxic
solvent.
c) Clean and flush out the housing with a light
mineral oil.
d) Do not use waste oil to clean the housing.