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SAFETY
PAGE 14
1.9.2.1
AREA CLASSIFICATIONS
Areas where the above hazards can exit are categorised into three ZONES for countries complying with
the standards produced by the IEC (International Electrotechnical Standardisation). The USA and
Canada still use standards which identify these areas as DIVISIONS.
IEC
USA & CANADA
ZONE 0:
Explosive gas atmosphere is
present continuously, or is present for long
periods
ZONE 1:
Explosive gas atmosphere is
likely to occur in normal operation.
ZONE 2
: Explosive gas atmosphere is not
likely to occur in normal operation and if it
does occur, it will exist for a short period
only.
DIVISION 1:
Hazardous concentrations of
flammable gases of vapours - or
combustible dusts in suspension -
continuously, intermittently or periodically
present under normal operating conditions.
DIVISION 2:
Volatile flammable liquids or
flammable gases present, but normally
confined within closed containers or
systems from which they can escape only
under abnormal operating or fault
conditions. Combustible dusts not normally
in suspension nor likely to be thrown into
suspension.
1.9.3
IGNITING CLASSIFICATIONS
The flammable gases are also given a classification according to the spark energy (or strength)
required to ignite the most easily ignitable mixture with air. Apparatus is approved as safe for a
particular group. It will also be safe for all groups that are less easily ignitable.
IEC
USA & CANADA
Surface Industries
Group IIC:
Acetylene
Group IIC:
Hydrogen more
Group IIB:
Ethylene easily
Group IIA:
Propane ignited
Mining Industries
Group I:
Methane (firedamp)
Surface Industries
Class I, Group A:
Acetylene
Class I, Group B:
Hydrogen more
Class I, Group C:
Ethylene easily
Class I, Group D:
Propane ignited
Class II, Group E:
Metal dust
Class II, Group F:
Carbon dust
Class II, Group G:
Flour, starch, Grain
Mining Industries
Unclassified:
Methane (firedamp
)
1.9.4
TEMPERATURE CLASSIFICATIONS
Mixtures can also be ignited by hot surfaces and gases are therefore given to a
TEMPERATURE
CLASSIFICATION
which identifies their ignition temperature.
TEMPERATURE
CLASSIFICATION
IGNITION TEMPERATURE °C
T1
T2
T3
T4
T5
T6
450
300
200
135
100
85
The maximum surface temperature of hazardous location apparatus
MUST NOT
exceed the gas
ignition temperature. Therefore, the best equipment has a
T6
temperature classification.
Summary of Contents for Reavell H5000 Series
Page 2: ......
Page 18: ...SAFETY PAGE 16...
Page 20: ...AMENDMENTS PAGE 18...
Page 22: ...COMPRESSOR LOG SHEET PAGE 20 REMARKS DATE REMARKS DATE...
Page 24: ...GENERAL DESCRIPTION AND OPERATION PAGE 22 4 6 LUBRICATION SCHEMATIC FLOW DIAGRAM...
Page 26: ...GENERAL DESCRIPTION AND OPERATION PAGE 24...
Page 36: ...OPERATION AND ROUTINE MAINTENANCE PAGE 34...
Page 44: ...DISMANTLING AND REASSEMBLY OF VALVES PAGE 42...
Page 50: ...FAULT GUIDE PAGE 48...
Page 72: ...PARTS LIST PAGE 70 93 95 1ST STAGE CONCENTRIC VALVE 9 8 6 5 4 2 1 3...
Page 74: ...PARTS LIST PAGE 72 96 97 2ND STAGE CONCENTRIC VALVE 2 1 3 4 5 6 5...
Page 80: ...PARTS LIST PAGE 78...
Page 92: ...ANCILLARY PARTS PAGE 90...
Page 94: ...STANDARD WIRING TERMINAL NUMBERS PAGE 92...
Page 95: ......