RS – Multi-Stage, I-280
Centrifugal Pump 280 – 16.03.EN
4
J. UNAUTHORIZED MODES OF OPERATION. The
warranty relating to operating reliability and safety of the
unit supplied is only valid if the pumping unit is used in
accordance with its designated use as described in the
following sections. The limits stated on the nameplate
must not be exceeded under any circumstances.
K. EXPLOSION PROTECTION. If the pumps/units are
installed in potentially explosive atmospheres, the
measures and instructions given in the following
sections K.1 to K.6 must be adhered to without fail, to
ensure explosion protection.
K.1 Unit Fill.
It is assumed that the system of suction
and discharge lines and thus the wetted pump
internals are completely filled with the fluid to
be handled at all times during pump operation,
so that an explosive atmosphere is prevented.
If the operator cannot warrant this
condition, appropriate monitoring devices must
be used.
CAUTION
In addition, it is imperative to make sure that
the seal chambers, auxiliary systems of the
shaft seal and the heating and cooling systems
are properly filled.
K.2 Marking.
The marking on the pump only refers to
the pump, i.e. the coupling and driver must be
regarded separately. The coupling must have
an EC manufacturer’s declaration. The driver
must be regarded separately.
An example of ATEX equipment marking is shown
below. The actual classification of the pump will be
engraved on the nameplate.
II 2 GD c IIC 135 ºC (T4)
Equipment Group
I = Mining
II = Non-mining
Category
2 or M2 = high level protection
3 = normal level of protection
Gas and/or dust
G = Gas
D = Dust
c = Constructional safety
(in accordance with EN13463-5)
Gas Group (Equipment Category 2 only)
IIA – Propane (typical)
IIB – Ethylene (typical)
IIC – Hydrogen (typical)
Maximum surface temperature (Temperature Class)
(Refer to Section II, Paragraph K.5)
K.3 Checking the Direction of Rotation.
If the explosion hazard also exists during
the installation phase, the direction of rotation
must never be checked by starting up the
unfilled pump unit, even for a short period, to
prevent temperature increases resulting from
contact between rotating and stationary
components.
K.4 Pump Operating Mode.
Make sure that the pump is always started up with the
suction-side shut-off valve fully open and the discharge-
side shut-off valve slightly open. However, the pump can
also be started up against a closed swing check valve.
The discharge-side shut-off valve shall be adjusted to
comply with the duty point immediately following the run-
up process.
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