DURCO MARK 3 ISO FRAME MOUNTED ENGLISH 85392719 06-12
Page 27 of 52
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6.2 Maintenance schedule
It is recommended that a maintenance plan
and schedule is adopted, in line with these User
Instructions, to include the following:
a) Any auxiliary systems installed must be monitored,
if necessary, to ensure they function correctly.
b) Gland packings must be adjusted correctly to
give visible leakage and concentric alignment of
the gland follower to prevent excessive
temperature of the packing or follower.
c) Check for any leaks from gaskets and seals.
The correct functioning of the shaft seal must be
checked regularly.
d) Check bearing lubricant level, and if the hours
run show a lubricant change is required.
e) Check that the duty condition is in the safe
operating range for the pump.
f)
Check vibration, noise level and surface temperature
at the bearings to confirm satisfactory operation.
g) Check dirt and dust is removed from areas around
close clearances, bearing housings and motors.
h) Check coupling alignment and re-align if necessary.
Our specialist service personnel can help with
preventative maintenance records and provide
condition monitoring for temperature and vibration to
identify the onset of potential problems.
If any problems are found the following sequence of
actions should take place:
a) Refer to section 7, Faults; causes and remedies,
for fault diagnosis.
b) Ensure equipment complies with the
recommendations in this manual.
c) Contact Flowserve if the problem persists.
6.2.1
Routine inspection (daily/weekly)
The following checks should be made
and the appropriate action taken to remedy any
deviations:
a) Check operating behaviour. Ensure noise,
vibration and bearing temperatures are normal.
b) Check that there are no abnormal fluid or
lubricant leaks (static and dynamic seals) and
that any sealant systems (if fitted) are full and
operating normally.
c) Check that shaft seal leaks are within acceptable
limits.
d) Check the level and condition of oil lubricant. On
grease lubricated pumps, check running hours
since last recharge of grease or complete grease
change.
e) Check any auxiliary supplies eg heating/cooling
(if fitted) are functioning correctly.
Refer to the manuals of any associated
equipment for routine checks needed.
6.2.2
Periodic inspection (six monthly)
a)
Check foundation bolts for
security of attachment and corrosion.
b) Check pump running records for hourly usage to
determine if bearing lubricant requires changing.
c) The coupling should be checked for correct
alignment and worn driving elements.
Refer to the manuals of any associated
equipment for periodic checks needed.
6.2.3
Re-lubrication
Lubricant and bearing temperature analysis can be
useful in optimizing lubricant change intervals. In
general however, the following is recommended.
Oil lubricated bearings
6.2.3.1
Normal oil change interval for mineral oil lubricated
pumps is every six months.
When synthetic oils are used the lubrication interval
can increase to 18 months, and up to 36 months for
the ISO 3A construction of pumps.
For pumps on hot service or in severely damp or
corrosive atmosphere, the oil will require changing
more frequently. Lubricant and bearing temperature
analysis can be useful in optimizing lubricant change
intervals.
The lubricating oil should be a high quality mineral oil
having foam inhibitors or synthetic without foam
inhibitors for oil mist. Synthetic oils may also be used
if checks show that the rubber oil seals will not be
adversely affected.
The bearing temperature may be allowed to rise to
50 ºC (90 ºF) above ambient, but should not exceed
82 ºC (180 ºF) (API 610 limit). A continuously rising
temperature, or an abrupt rise, indicate a fault.
Pumps that handle high temperature liquids may
require their bearings to be cooled to prevent bearing
temperatures exceeding their limits.
Grease lubricated bearings
6.2.3.2
When grease nipples are fitted, one charge between
grease changes is advisable for most operating
conditions; ie 2 000 hours interval. Normal intervals
between grease changes are 4 000 hours.
Summary of Contents for Durco Mark 3
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