3 Introduction
TZ-67
3.6
ATEX/IECEx temperature class and code
The maximum surface temperature depends mainly on operating conditions which are the temperature of the cleaning fluid and
the ambient temperature.
Group II EPL Ga
The gas temperature class is corrected with a safety margin of 80% due to a requirement for Group ll EPL Ga equipment.
The gas temperature class depends on the cleaning fluid temperature or the ambient temperature, whichever of the two is
the highest.
Table for determining temperature class (gas atmospheres)
Temperature Class
Cleaning fluid Temperature,
T
p
(°C)
Ambient temperature,
T
amb
(°C)
85°C (T6)
≤
+68°C
≤
+68°C
100°C (T5)
≤
+80°C
≤
+80°C
135°C (T4)
≤
+108°C
≤
+108°C
175°C
≤
+140°C
≤
+140°C
Group III EPL Da
The dust temperature class depends on the cleaning fluid temperature or the ambient temperature, whichever of the two is
the highest.
No dust layer is considered.
Table for determining temperature class (dust atmospheres)
Temperature code
Cleaning fluid temperature,
T
p
(°C)
Ambient temperature,
T
amb
(°C)
T85°C
≤
+85°C
≤
+85°C
T100°C
≤
+100°C
≤
+100°C
T135°C
≤
+135°C
≤
+135°C
T140°C
≤
+140°C
≤
+140°C
Example of gas class determination
Cleaning fluid temperature is 67°C and ambient temperature is 75°C.
Gas class = T5
ATEX/IECEx marking on the equipment:
II 1G Ex h IIC 85°C…175°C Ga
II 1D Ex h IIIC T85°C…T140°C Da
3.7
Quality system
The Alfa Laval Toftejorg tank cleaning machines are produced according to Alfa Laval Kolding´s ISO 9001 international
Standard certified quality system.
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