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SAFETY INSTRUCTIONS IN ACCORDANCE WITH DIRECTIVE 2014/34/EU - J-OT-ST ATEX
EN – SAFETY INSTRUCTIONS IN ACCORDANCE WITH DIRECTIVE 2014/34/EU - J-OT-ST ATEX
Tab. 4
Temperature class
Rolling bearings must be replaced at least every 10 years or after 10000 hours of operation (the first of the two conditions that
occurs). The bearings must solely be replaced by Varisco S.r.l. or by skilled technical personnel (for maintenance and
replacement of the bearings, refer also to the user and maintenance manual of the pump).
CAUTION Poor or incorrect lubrication of the bearings invalidates the requirements concerning safety and
protection against the risk of pump explosion.
13. SECURING THE COMPONENTS TO THE BASE
The pumps provided pre-coupled to an electric motor by means of couplings have already been subjected to optimal alignment
between the various transmission shafts, during assembly in the factory. However, during on site machine installation, the
alignment must be re-checked as follows:
- place the base on the floor of the slab by inserting the anchor bolts in the holes of the base without tightening the bolts;
- remove the coupling covers;
- tighten the bolts of the anchor bolts and recheck the axial, radial and parallel alignment, as described in the manuals of the
individual couplings. If any misalignments are noted, return them within the allowed values according to the assembly
instructions of the couplings;
- reposition the coupling covers before start-up.
It is also essential to periodically check the tightening torque of the bolts that secure the individual components to the base
(including the screws that hold the coupling cover).
14. CAVITATION
Besides being harmful to the pump, cavitation is a dangerous phenomenon in a potentially explosive atmosphere: check that the
pump has been chosen correctly by referring to the NPSH curve required by the pump. The installer must calculate the available
NPSH of the system (considering therefore also the filters, the valves and all the fluid dynamic leaks in suction).
CAUTION Varisco S.r.l. disclaims any liability for malfunctions caused by inadequate available NPSH, limiting
itself to supplying the NPSH value required by the pump.
of the pump
T3
T4
T5
Calibration of the bearing zone
temperature probe
195 °C
130 °C
95 °C
15
15
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