OSNA NMH 32, Руководство по эксплуатации

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7 Maintenance and repair
44 NMH/NMV High Pressure Centrifugal Pump
7.2 Operational monitoring
Ensure that the pump runs smoothly and quiet-
ly at all times. Maximum permitted room tem-
perature 40°C. The bearing temperature may
be up to 50°C above the room temperature,
but may not exceed 90°C (measured externally
on the bearing housing).
NOTICE
Material damage due to dry running!
► Ensure that the pump is properly filled.
► Longer operation against a closed shut-off
device is not permitted.
If using a gland packing, this should drip slight-
ly during operation. The gland may only be
tightened slightly. Leakage is always required
if using pure graphite packing rings. If leakage
is too high after a longer period of operation,
evenly tighten the nuts on the gland by 1/6 of a
rotation, and observe the leakage. If it is no
longer possible to adjust the gland, insert an
additional packing ring. It is generally not re-
quired to replace the entire packing.
If using mechanical seals, these display only
limited or invisible leakage losses (in vapor
form). They require no maintenance.
The reserve pumps must be activated once
per week in order to ensure operational readi-
ness. To do so, switch the reserve pumps on
and immediately off again. Monitor the function
of the additional connections.
Replace the elastic elements of the coupling
promptly should you notice signs of wear over
time.
The bearings have a high-quality lithium-soap
grease. Under normal operating conditions,
this is sufficient for 15,000 operating hours or 2
years. If operating under unfavorable condi-
tions, such as high room temperature, high
humidity, dusty air, aggressive industrial at-
mospheres, etc., check the bearings at an
earlier time, and clean and relubricate if nec-
essary. When relubricating, use a lithium-soap
grease that is free of resins or acids, does not
become brittle and protects against rust.
Only half fill the cavities of the bearings with
grease. If necessary, you can also lubricate
the bearings with other soap-based greases.
As greases with different soap bases may not
be mixed, ensure that the bearings are thor-
oughly washed beforehand. Adjust the neces-
sary relubrication intervals according to the
greases used.
1. Test at appropriate intervals:
-
Maintenance of the minimum flow
rate
-
Room temperature < 40 °C
-
Temperature of the anti-friction
bearings < 90 °C
(measured on the bearing hous-
ing)
-
No change in the normal operating
conditions
-
Alignment of the coupling and
condition of the elastic elements
2. Please ensure the following for smooth
operation:
-
No dry running
-
No leaks
-
No cavitation
-
Gate valve open on suction side
-
Filter free and clean
-
Sufficient inlet pressure
-
No unusual running noises or vi-
brations
-
No unpermitted leakage on the
shaft seal
-
Auxiliary operating systems func-
tion correctly