Zonage ATEX, Audit, Inspection et
Formation ISM-ATEX

Criterion

Score

Notes
/ Comments /Examples

Areaclassification

Zone0

15points

Or
Class I Division1

Zone1

10points

Or
Class I Division1

Zone2

5points

Or
Class I Division2

Unclassified

1point

Non-Hazardous
(Safe)

Environmentalconditions

OutdoorExtreme

5points

Exposed to weather elements (water,
highhumidity, dust, sand, temperatures +40ºC), deluge/seaspray, severe
airbornepollution

OutdoorModerate

3points

Near
laydown area but protected, onshore outdoor(dry heat rather thanhumid)

Indoor

1point

Dry,
controlledclimate

Corrosion

High

4points

Delaminating
of base metal, ineffectivecoating

Medium

2points

Degraded
coating due to scaleforming

Low

1point

Light
to no surfacecorrosion

Vibration
/ Exposure to mechanicaldamage

High

4points

Rotating
and reciprocating equipment (example:offshore installation drill floor),
frequentdamage

Medium

2points

Flow/process
induced vibration, acoustic vibration,fast opening/closing valves,
occasionaldamage

Low

1point

Equipment
secured to main structure, low vibrationareas(example: inside an enclosure),
raredamage

Historical
loss of containment (hydrocarbon leakage over 10years)

High

4points

More
than 1 incident recorded in secondaryarea

Medium

2points

1
incident recorded in secondaryarea

Low

1point

No
incidentsrecorded

Historical
hardwarefailure

High

4points

Multiple
failures recorded in area ofequipment

Medium

2points

1
failure recorded in secondary or equipmenttype

Low

1point

No
recordedfailures

Totalpoints

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