POMPE CUCCHI MX Series, Руководство по эксплуатации и техническому обслуживанию

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Pompa ad Ingranaggi - Serie MX
Gear Pump - MX Series
67
Supplementary instructions for operation and maintenance of pumps and pumping sets
which work in potentially explosive atmospheres (Directive 2014/34/EU)
Directive 2014/34/EU (that replaces Directive 94/9/EC, also known as ATEX), came into force on 30/04/2014
and concerns
“equipment and protective systems intended for use in potentially explosive atmospheres ” .
Equipment ad units intended for use in potentially explosive atmospheres are classified in groups and catego-
ries on the basis of the degree of safety they offer, so to their suitability to operate in locations with different
classifications:
Group I
(mines and related surface
plants exposed to risk of release
of firedamp and/or combustible
dust)
Group II
(other locations with potentially esplosive atmospheres)
Category M1
(very high
protection
level)
Category M2
(high protec-
tion level)
Category 1
(very high protection
level)
Category 2
(high protection
level)
Category 3
(normal protection level)
G
(gas)
D
(dust)
G
(gas)
D
(dust)
G
(gas)
D
(dust)
Zone 0 Zone 20 Zone 1 Zone 21 Zone 2 Zone 22
environments where
explosive atmospheres
are detected for long
periods of time
environments
where explosive
atmospheres are
probably detected
environments where ex-
plosive atmospheres are
rarely detected and, how-
ever, for short periods of
time
For each zone, there are 6 classes of temperature, which have been stated depending on the minimum ignition
temperature of the explosive mixture:
Temperature Class Max. Surface Temperature
T1
T2
T3
T4
T5
T6 450°C
300°C
200°C
135°C
100°C
85°C
At the order, the Customer must define:
-
w orking conditions of the pump (capacity, head, NPSH, local temperature,…);
-
chemical and physical characteristics of fluid to be pumped;
- classification of dangerous area;
-
temperature class.