Safety
Operating instructions VISCOPOWER
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2.4 Working in potentially explosive atmospheres
Observe the
Technical Guidelines for Flammable Liquids
(TRbF) as well as explosion
protection guidelines for raw materials and the chemical industry as laid down by statu-
tory accident insurance and prevention institutions (BG RCI).
When pumping flammable media of explosion groups IIA and IIB and temperature clas-
ses T1 to T4, only progressive cavity pumps approved for use in category 1 (ZONE 0)
may be used.
Observe the EU type examination certificate or certificate of conformity.
The progressive cavity pump must not be used in a stationary position in potentially ex-
plosive atmospheres.
Keep possible ignition hazards away from the pump.
Use a motor protection device including a switch-on lock to prevent unintended auto-
matic start-up (e.g. by switching on the progressive cavity pump by plugging it in).
For automatic filling, a motor with protection device without switch-on lock can also be
used.
In potentially explosive atmospheres, only explosion-proof motors with approval for cat-
egory 2 may be used.
If the motors are operated together with the progressive cavity pump, a comprehensive
and clear equipotential bonding must be ensured (see chapter 7.2
Establishing equipo-
tential bonding
).
Connect the electric motor with an explosion-proof plug or via an explosion-proof termi-
nal box.
Arrange the progressive cavity pump in such a way that friction sparks and impact
sparks are prevented and safe operation is ensured by the operating conditions.
Any repairs at explosion-proof progressive cavity pumps and motors may only be car-
ried out by service personnel or an authorised workshop.
Cleaning and maintenance must not be carried out inside the potentially explosive at-
mosphere.
When pumping non-conductive media, there is a possibility that the pumped medium
may become electrostatically charged.
The explosion-proof motor, gearbox and coupling must be outside the movable vessel.
The hose used must be sufficiently conductive (see IEC-TS-60079-32-1).
Regularly check all motors according to the applicable/country-specific regulations and
accident prevention regulations (in Germany e.g. DGUV regulation 3).
Handling fluids with low conductivity can lead to static charges. For this reason, check
the filling process again (observe IEC-TS-60079-32-1).
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