VARISCO V Series Operating Manual

Also see for V 100-2: Operating manual INSTRUCTIONS FOR THE INSTALLATION, USE AND MAINTENANCE Instructions for the use and maintenance

VARISCO V Series Operating Manual Manual pdf 9 page image

Page 92.9.1 Filling the unitNormally the system of suction and discharge lines and consequently the pump’s interior that is in contactwith the fluid is permanently filled with the pumped medium during pump operation to prevent any potentiallyexplosive 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 conditionsIn the standard model of the pump, the inner (fluid-filled) space of the magnetic coupling is cooled by apartial 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, makesure to take suitable monitoring measures (see 4.3.4).In case of overloading, overheating or non-observance of design data or improper selection of themagnetic coupling, the internal and external magnet may become desynchronized. Furthermore, thermalenergy generated in the containment shell or on the external magnet may also cause an inadmissible risein 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) causingliquid to leak, make sure to provide leakage detection facilities (see 4.3.4). If necessary, check if there isany potential interaction between the liquid and the pumped medium.2.9.3 MarkingsMarkings and signs on the pump refer only to a specific pump section, i.e., shaft coupling and motor shouldbe considered separately. A Manufacturer’s Declaration with the appropriate marking is required for theshaft coupling. The drive is subject to a separate marking on the pump section. Example of marking onthe pump section: II 2 GT3 -T4.The marking shows the range of theoretically available temperature classes. Admissible temperaturesdepending on the relevant pump design are specified in 2.9.6.Variant 1:II 2 G Eex c T3 – T4II 2 G: Surface unit intended for use in an area where an explosive atmosphere in the form ofgases 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