22
0698-050 B70V/B70V-SR - 04/19
en
The eccentric screw drum pumps type B70V are used
to pump from mobile vessels ammable liquids, which
belong to the explosion groups IIA and the temperature
classes T1 to T4.
The external part of the pump tubes between suction
orice and pressure joint corresponds to category 1.
The external part of the pump tubes between the pres-
sure joint and the connecting part for a drive motor and
the internal part of the pump tubes in MS variants (cov-
ered by the pumped liquid in case of intended delivery)
correspond to category 2.
When the drum pump is used, all additional compo-
nents tted to the connecting part (coupling, gear, drive
motor, etc.) have to be outside of the mobile container.
In this respect, the requirements of unit group II (sub-
class II A), category 2, temperature class T4 have to be
met.
It has to be ensured that only a stator made of PTFE is
built-in.
the 75.1 size must not be used to pump am-
mable uids.
The drive motor (electrical or with compressed air
drives) may not exceed an output of 1.0 kW and a speed
of 900 1/min.
The drum pump must not be employed for non-mobile
operation. The operation of the pump has to be moni-
tored during the pumping process so that dry running
and empty running phases are restricted to the abso-
lutely minimum.
Before starting up the pump, an equipotential bonding
must be established between the pump, the container
to be emptied and the container to be lled.
The potential between the pump and the container to
be emptied is equalized by connecting the equipotential
bonding cable (order no. 0204-994). Paint and dirt
should be removed from the connecting points in order
to improve the conductivity.
The conductive connection between the full and empty
containers is achieved by means of a conductive sub-
strate (e.g. conductive gratings).
The transition between container and earthing must
also be conductive.
(1) Equipotential bonding cable, (2a) Conductive sub-
strate or connection of an equipotential bonding cable
to each of the two drums, (2b) Galvanic connection (low
contact resistance towards earth), (3) Conductive hose,
(4) Conductive connection between hose and hose con-
nector, (5) pump tube category 1/2, (6) explosion proof
motor
Anyway the hose connected to the pressure joint of the
drum pump must be suciently electrically conductive
– with respect to electrostatic charges.
The ohmic resistance between the ttings – in this
case between the pump tube and the nozzle – may not
exceed a limited value depending on the respective
hose type.
1. Identication of the hose with the symbol “M”
Limited value ≤ 10
2
Ω
2. Identication of the hose with the symbol „Ω“
Limited value ≤ 10
6
Ω
The hose connection must ensure a highly conductive
transition between hose and pump tube, as well as be-
tween hose and nozzle.
If this is not the case, all conducting parts (such as the
metal mouth piece at the end of the hose) shall have to
be earthed separately.
Connecting of conductive hoses with armatures
to the hose lines requires the identication and
examination to DIN EN 12 115.
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