Series SD 39
24
• Pumps with gland packing: Adjust the gland gradually with
the pump running. The packed gland must not overheat and
there should be a constant drip through the packing. Signifi-
cant initial leaking is not harmful and will be automatically re-
duced as the packing swells.
• V-Belt driven pumps: V-Belt stretch during the initial run-
ning-in period. For this reason, re-adjust V-belt periodically -
initially after 15 minutes - to avoid slipping or burning. Belts
which are adjusted too tight can cause damage to the bear-
ings.
4.3.2 Functional check
• Confirm that the readings of the pressure and vacuum gaug-
es and the motor ammeter, together with that of the flow me-
ter (if fitted) correspond to the data specified in the contract
documentation.
• Record readings for future reference.
• Check the bearing temperature. A temperature of 50°C above
the ambient temperature is acceptable.
4.3.3 Closed valve operation
4.4 Shut-down
4.4.1 Switching off
• Close the isolating valve in the discharge pipe.
• Switch off the pump.
• If a non-return valve is fitted in the discharge pipe and the up-
stream pressure is maintained, it is not necessary to close the
isolating valve.
• Close the additional valves.
4.4.2 Draining
• If frost is anticipated, drain any pumps or pipework not in use,
or take other precautions (lagging, trace heating etc.) to pre
-
vent damage from frost.
• After pumping polluted media and to prevent corrosion when
not in use the pumps should be drained and, if necessary,
flushed.
5. Maintenance/servicing
5.1 General precaution
5.2 Maintenance and inspection
5.2.1 Lubricants, oil capacities and lubricating intervals
5.2.1.1 Pump with grease lubricated bearings
• Grade of grease: Lithium-based grease according to DIN
51825, non-ageing, non-acidic, non-corroding, water-resist
-
ant with a working temperature of -30 to +130°C, penetration
rate of 2 to 3, working penetration of 265 to 295 and a dripping
temperature of approx. 190°C.
• Recommended commercially-available grades of grease:
- OPTIMOL OLISTA LONGTIME or OLIT 2, (OPTIMOL)
- GLISSANTO 20, (DEA)
- ENERGREASE MSLS-EP2, (BP)
• Pump without grease nipple on bearing housing:
The bearings are filled with grease in the factory before
delivery and this should last for approx. 15,000 working
hours or two years. Under unfavourable working condi-
tions such as a hot climate, dampness or overheating, the
bearings need to be checked and re-greased before this
period.
• Pump with grease nipple on bearing housing:
- Are greased in the factory before delivery.
- Need to be re-greased with approx. 20 to 30 g per point
every six months.
- Avoid over-greasing as this can lead to a build up of heat.
- After regreasing several times or if overheating occurs
(50°C above ambient) open the bearing cover and re
-
move surplus or used grease.
- Do not pack new bearings more than half full with clean
grease.
5.2.1.2 Pump with oil lubricated bearings
• Grade of oil: The bearing housing is filled with environmen-
tally friendly oil before dispatch e.g. Geralyn Fluid HT 32,
(Reiner) or equivalent brands with a viscosity of 22
mm²/s
(cSt) at 40°C.
• Oil changes: Initially after 200 running hours, then every
3,000 running hours or at least annually.
• Dispose of used oil in an approved manner.
• For refilling, refer to para. 4.1.1.2.
5.2.2 Monitoring the pump during operation
For satisfactory operation carry out the following checks as rou-
tine:
• Monitor the smooth running of the pump.
• For pumps with gland packing rings confirm the leakage
rate of the shaft seal as 5 to 10 l/hr. If gland sealing water is
supplied check the flow rate.
• Pumps with mechanical seals: If leakage occurs at shaft
clean, inspect and if necessary replace the mechanical seal.
A leakage of between 0.2 and 5
ml/h is possible depending
on running smoothness, pressure, rotational speed and shaft
diameter (mechanical seals are wearing parts for which no
guarantee can be given).
• V-Belt driven pumps: Check belt tension.
Never run the pump with the suction and discharge
isolating valves closed or with the discharge valve
closed at non-return valve installed at suction side.
Under such conditions the pump contents will be
rapidly vaporised and very high pressures generat-
ed. These may exceed the bursting pressure of the
pump casing, creating a serious hazard to personnel
and property.
• Never work on the set until the electricity supply
has been disconnected completely. It must be im
-
possible for the set to be started inadvertently.
• Always wear safety gloves when assembling/strip-
ping the pumps or when adjusting glands.
• Never place hands into pump cleaning openings.
Nominal diameter
discharge branch
Sealing water required
[m³/h] at Δp 0,5 bar
200 0.20
250-500 0.25
Table 2: Sealing water required
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