Piusi K33 Atex, Manual

Page: 19 / 32

M0217 EN 19
EN
C1 DEFINITION OF CLASSIFIED ZONES
FOREWORD Definition of zones as shown in directive 99/92/CE
ZONE 0 Place where an explosive atmosphere made up of a mix of air and
inflammable substances in the form of gas, vapour or mist is con-
tinuously present, either for long periods or frequently.
Note: Generally speaking, said conditions, when they occur, involve
the inside of tanks, pipes and containers, etc.
ZONE 1 Place where it is probable that an explosive atmosphere, made up of
a mix of air and inflammable substances in the form of gas, vapour or
mist, can occur occasionally during normal operation.
Note: Said zone can also include:
- places in the immediate vicinity of zone 0;
- places in the immediate vicinity of supply openings;
- places in the immediate vicinity of filling and and emptying open-
ings;
- places in the immediate vicinity of appliances, protection systems and
fragile glass and ceramic components, or components made of other
similar materials;
- places in the immediate vicinity of inadequately sealed stuffing
boxes, e.g., on pumps and valves with stuffing box.
ZONE 2 Place where it is improbable that an explosive atmosphere, made up
of a mix of air and inflammable substances in the form of gas, vapour
or mist, can occur during normal operation, but which, if it does oc-
curs, only persists for a short time.
Note: Said zone can include, among others, places surrounding the zones
0 or 1.
ZONE 20
Place where an explosive atmosphere in the form of a cloud of com-
bustible powders in the air is continuously present, either for long
periods or frequently.
Note: Generally speaking, said conditions, when they occur, involve
the inside of tanks, pipes and containers, etc.
ZONE 21 Place where it is probable that an explosive atmosphere, in the form of a
cloud of combustible powders in the air, can occur occasionally during nor-
mal operation.
Note: Said zone can include, for example, among others, places in
the immediate vicinity of powder loading and emptying points and
places where powder layers form or which, during normal operation,
could produce an explosive concentration of combustible powders
mixed with the air.
ZONE 22 Place where it is improbable that an explosive atmosphere, in the
form of a cloud of combustible powders in the air, occur during
normal operation but which, if it does occur, only persists for a short
time.
Note: This zone can comprise, among others, places near appliances,
protections systems and components containing powder, out of
which the powder can come out due to leaks with the formation of
powder deposits (e.g., milling salt, where the powder comes out of
the mills and deposits).
ZONE 1 ZONE 0
ZONE 20
ZONE 2 ZONE 21