VARISCO SaxMag V Series, Руководство по эксплуатации

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OPERATING MANUAL - SAXMAG V
Page 9
2.9.1 Filling the unit
Normally the system of suction and discharge lines and consequently the pump’s interior that is in
contact with the fluid is permanently filled with the pumped medium during pump operation to prevent
any potentially explosive atmosphere and the risk of dry running.
If the operator cannot meet this requirement, we recommend providing appropriate monitoring facilities.
Moreover, ensure that auxiliary, heating and cooling systems are filled properly.
2.9.2 Special operating conditions
In the standard model of the pump, the inner (fluid-filled) space of the magnetic coupling is cooled by a
partial flow that branches off from the main fluid flow. If particular properties of the fluid (sticking,
clogging) lead to a disruption of the cooling flow, the temperature may rise inadmissibly. If such risk
exists, make sure to take suitable monitoring measures (see 4.3.4).
In case of overloading, overheating or non-observance of design data or improper selection of the
magnetic coupling, the internal and external magnet may become desynchronized. Furthermore,
thermal energy generated in the containment shell or on the external magnet may also cause an
inadmissible rise in temperature. If such risk exists, make sure to take suitable monitoring measures
(see 4.3.4).
If an environmental hazard arises as a result of damage to the containment shell (rare incident) causing
liquid to leak, make sure to provide leakage detection facilities (see 4.3.4). If necessary, check if there
is any potential interaction between the liquid and the pumped medium.
2.9.3 Markings
Markings and signs on the pump refer only to a specific pump section, i.e., shaft coupling and motor
should be considered separately. A Manufacturer’s Declaration with the appropriate marking is required
for the shaft coupling. The drive is subject to a separate marking on the pump section. Example of
marking on the pump section:
II 2 GT3 -T4.
The marking shows the range of theoretically available temperature classes. Admissible temperatures
depending on the relevant pump design are specified in 2.9.6.
Variant 1:
II 2 G Eex c T3 - T4
II 2 G: Surface unit intended for use in an area where an explosive atmosphere in the form of
gases or mists is likely to occur occasionally in normal operation (EN 1127-1 Sec. 6.3)
Eex c: Equipment with protection by constructional safety (prEN 13463-5)
T3 - T4: Temperature classes T3 - T4