Surface Temperature; Fluid Temperature; Build Up Of Explosive Mixture; Auxiliary Devices - Wilo MMI50V Instrucciones De Instalación Y Funcionamiento

CatégorY :
2 = areas where dangerous explosive atmosphere can be expected
occasionally (zone 1)
3 = areas where dangerous explosive atmosphere can be expected only
rarely and for short periods (zone 2)
GaS or Dust :
G = Gas
Those pumps are not « D » Dust certified.
PUMP Protection :
c = safe by construction
maximum surface Temperature (tEMPERATURE CLASS TO atEX
94/9/EC) :
T1 = 450°C
T2 = 300°C
T3 = 200°C
T4 = 135°C
ADDITIONAL INFORMATION TO BE CONSIDERED :
X = special conditions of use me be respected
2.8.2

SURFACE TEMPERATURE

Ensure that the equipment temperature class is suitable for the
hazard zone that is defined by the plant operator.
Pump temperature class is as stated on the nameplate. It is based on a
maximum ambient temperature of 40°C. (ask manufacturer for higher
ambient temperatures).
The surface temperature taken on pump surface is influenced by the
temperature of the handled liquid. The maximum permissible
temperature depends on the ATEX temperature class and must not
exceed the values indicated in the ATEX additive attached to the pump.
Temperature at bearings depends on permitted minimum flow.
If pump is run in zone 1, use of a flow controler is mendatory.
Refer to flow sensor instruction and operating manual.
A minimum flowrate will have to be maintained :
- 20% of Qn for Qn> ou = 4m3/h
- 50% of Qn for Qn < 4m3/h
With Qn = pump nominal flowrate.
2.8.3

FLUID TEMPERATURE

Ensure that the equipment temperature class is suitable for the
hazard zone that is defined by the plant operator.
Pump temperature class is as stated on the nameplate. It is based on a
maximum ambient temperature of 40°C. (ask manufacturer for higher
ambient temperatures).
The surface temperature taken on pump surface is influenced by the
temperature of the handled liquid. The maximum permissible
temperature depends on the ATEX temperature class and must not
exceed the values indicated in the ATEX additive attached to the pump.
The internal bearings temperature rise is taken into account.
The maximum fluid temperatures indicated below are given
accordingly :
T1  400°C
T2  275°C
T3  180°C
T4  115°C
It is highly recommended to install a flow controller on discharge
pipe if there is risk to run the pump on a closed discharge shut-off valve.
(the flow sensor must be installed when pump is operated in zone1).
Motor overload trips should be correctly calibrated. Proceed with
regular cleanings if pump is installed in a dirty or dusty environment.
2.8.4

BUILD UP OF EXPLOSIVE MIXTURE

Ensure that pump will not run dry.
Make sure that the pump hydraulic is always wet : minimum liquid level
should never be under the lower pump bearing. It is highly
recommended to use a lever gauge in the tank to stop the pump at
minimum level (alarm and stop) in both ATEX zones 1 and 2.
Make sure that the pump is run with filled-in hydraulic and discharge
lines to avoid build up of an explosive atmosphere. In addition it is
essential that auxiliary sealing systems are properly filled and working
correctly.
To avoid potential hazards from fugitive emissions of vapor or gas to
atmosphere the surrounding area should be correctly ventilated.
2.8.5

AUXILIARY DEVICES

Intermediate shaft bearing(s) that are intergradted in some variants of
pumps with motor assembly type TM or TH must be lubricated with an
external lubricating device (compatible clean and non hazardous fluid).
Liquid injection pressure should be maintained between 0.5 and 1 bar
(avarage flowrate 50l/h).
Motor powersupply should be switched off is pressure decreases
under 0.5bar.
2.8.6

PREVENTING LEAKAGE

The pump must only be used to handle the liquids for which it has
been defined.
If the pump is installed outdoor, make sure liquid containing parts are
drained and/or protected against freezing.
If leakage of liquid to the atmosphere can result in a hazard then a
leakage detection sensor should be installed.
2.8.7

COMPLETE UNIT

ATEX certification for a complete unit according to ATEX Directive
94/9/CE is given according to lower protection level of the integrated
component. This comment applies particularly to the electric motor
protection.
2.8.8 PUMP UNIT DELIVERED WITHOUT MOTOR /
WITHOUT SENSORS
If a partial delivery is required (electric motor, flexible coupling,
coupling guard or sensor not supplied), an integration certificate will be
established.
It will be the integrator's responsibility to supply missing parts in order
to fulfill ATEX requirements for the complete machine.
ENGLISH
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