RDL
7. Maintenance/Repair
7.1 General instructions
The operator is responsible for ensuring that all maintenance inspection and installation work is carried out by authorized duly
qualified staff who are thoroughly familiar with these operating instructions.
A regular maintenance schedule will help avoid expensive repairs and contribute to trouble-free, reliable operation of the pump
with a minimum of maintenance expenditure and work.
Work on the unit must only be carried out with the electrical connections disconnected. Make sure that the
pump set cannot be switched on accidentally (danger of life!).
Pumps handling liquids posing health hazards must be decontaminated. When draining the medium see to
it that there is no risk to persons or the environment. All relevant laws must be adhered to (danger of life!).
7.2 Supervision during operation
After start up and if pump is operating consider the following items.
a) Adjust pump for the operation point (pressure and flow) opening the discharge valve slowly just after driver has reached its
nominal speed.
b) Control current (amperage) of electric motor.
c) Assure that pump operates free of vibration and abnormal noises.
d) Control bearing temperature. It can reach up to 50ºC (122ºF) above ambient temperature, however total temperature can
not exceed 90ºC (194ºF).
e) Adjust the auxiliary valves and packing tight in order to avoid an excessive leakage on shaft seal.
Fig.22 – Approximate number of drops
On fig.23 “V” corresponds to the peripheral speed
(in m/s) calculated by formula:
π x d x n where:
60
d = external diameter of the shaft protecting sleeve (in m) = “∅ d” of shaft seal housing of table 1
n = rotation per minute that pump is working (rpm)
7.3 Bearing maintenance
Maintenance objective is to extend the useful life of the bearing system. It includes observation of general condition of
bearings, cleaning, lubricating and bearing detailed examination.
Lubricant properties decrease due to age and mechanical work, besides all lubricants are contaminated during work, therefore
must be changed at intervals.
For the 1
st
set-up assure that bearings are free of dirt and moisture.
Suction pressure (Kp/cm
)
Drops / min
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