HAMMELMANN B7.02502.0210, Руководство по эксплуатации, Страница: 297 / 311

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Because of the very close contact between pumps and motors in close coupled design (ZLK and ZLI,
Industrial Pumps; ZTK and ZTI, Thermal Oil Pumps; and ZLI, Hot Water Pumps), there is a thermal influence
between pump and motor.
Especially for motors with protection type EExe (increased safety) the possibility exists that the declaration of
conformity looses its validity, as for the EC type examination an ambient temperature of 40°C is taken as a basis.
This admissible ambient temperature could be exceeded in the area of the motor flange when pumping hot liquids.
In the event of fluid temperature above 80ºC, the temperature category of the unit / set is determined by the pump not
by the motor.
The motor is usually rated for continuous operation at the data indicated in the technical data. Frequent motor
start-ups may result in increased surface temperatures at the motor. Contact the motor manufacturer, if necessary.
Based on ambient temperatures of max. 40 º C and assuming that the pump unit is properly serviced and operated
and that the surfaces in the bearing area are freely exposed to the atmosphere, compliance with temperature class
T4 is warranted for surfaces in the area of the rolling element bearings.
If temperature classes T5 (100ºC) and T6 (85ºC) have to be complied with, special measures may have to taken with
regard to bearing temperature. In such cases, and if ambient temperatures are higher, contact the manufacturer.
Operator’s errors or malfunctions may result in substantially higher temperatures. Please refer to section 5.1 in this
context.
Mechanical seals may exceed the specified temperature limits if run dry. Dry running may not only result from
an inadequately filled seal chamber, but also from excessive gas content in the fluid pumped.
Pump operation outside the specified operating range may also result in dry running.
Shaft seals shall be regularly checked for leakage.
The above stated and also stated in other paragraphs related to the mechanical seal, is also applicable for
any shaft sealing execution (i.e. packing rings, lip seal rings, etc.)
In any case the operator has the responsibility to check the real compatibility between the normal leakage of the fluid
and the atmosphere in the case of shaft sealing made by packing rings.
It has to be verified, that V-rings are properly fitted to the shaft. Only proper contact should be exist between
the sealing lip and the shaft.
5.9 Maintenance
Only a pump set, which is properly operated and maintained in perfect technical condition, will give safe and
reliable operation.
This also applies to the reliable function of the rolling element bearings whose actual lifetime largely depends on the
operating mode and operating conditions.
Regular checks of the lubricant and the running noises will prevent the risk of excessive temperatures as a result of
bearings running hot or defective bearing seals.
The correct function of the shaft seal must be checked regularly.
Any auxiliary systems installed must be monitored, if necessary, to make sure they function correctly.
Static sealing elements shall be regularly checked for leakage.
The coupling guard and any other guards of fast rotating components must be regularly checked for deformation and
sufficient distance from rotating elements.
Regularly verify the correct position and the status of plastic components exposed to the atmosphere.
It is strongly recommended to draw up a maintenance schedule, which includes the above-mentioned points.
In case of repair only original Sterling Fluid Systems spare parts must be used, which comply with the
corresponding EC Directives.
Sterling Fluid Systems
In the search to improve continuously its products, Sterling Fluid Systems
reserves the right to modify its products at any time without prior notice
For local contact details: www. sterlingfluidsystems.com
HAMMELMANN Code no.: 04.03226.0769
Type 32-200