4 Installation
TZ-67
4.4 Specific conditions for safe use in accordance with ATEX/IECEx certification
Warning:
Max. permitted steaming temperature
The maximum permitted steam temperature through the machine and ambient temperature is 140°C.
Warning:
Steaming tanks larger than 100 m³
Tanks with capacities larger than 100 m³ that could contain a flammable atmosphere should not be steam
cleaned, as steam cleaning tanks produces an electrostatically charged mist. Tanks smaller than 100 m³ may
be steam cleaned.
For further information see IEC/TS 60079-32-1:2013 Explosive atmospheres – Part 32-1: Electrostatic hazards,
guidance. With focus on clause 7.10 and 8.5.
Tank size information
The tank cleaning machine has been certified by accredited notified body and can operate in tanks having an enclosed volume
up to 100 m³ as long as all ATEX/IECEx warnings in the instruction manual are complied with.
General guidelines for tanks larger than 100 m
3
:
Tanks larger than 100 m³ must not be steam cleaned – See guide IEC/TS 60079-32-1:2013 clause 7.10.5 and 8.5
To use the unit in tanks larger than 100m³ is possible under certain conditions.
It is necessary to know the current factors such as tank size, cleaning solvent and product.
Additives can be used in the cleaning solvent, or, for example, the tank can be filled with nitrogen. The basic guidelines are
described in the guide IEC/TS 60079-32-1:2013.
It must be ensured that the equipollently bonding of all conductive metal objects is in accordance with national regulations
for use.
The cleaning fluid conductivity must correspond to the products in the group “High conductivity”, cf. IEC/TS 60079-32-1:2013
clause 7.1 and 7.2.
High conductivity
> 10 000 pS/m
Medium conductivity
between 25 ×
ε
r pS/m and 10 000 pS/m
Low conductivity
< 25 ×
ε
r pS/m
For liquids with a dielectric constant of around 2, (e.g. hydrocarbons), these classifications reduce to:
High conductivity
> 10 000 pS/m
Medium conductivity
between 50 pS/m and 10 000 pS/m
Low conductivity
< 50 pS/m
Following a guidance document such as IEC/TS 60079-32-1:2013 to establish safe use of machinery and process is the users
own responsibility and is not covered by the ATEX/IECEx certification for this unit except for tanks up to 100 m
3
. For further
information see IEC/TS 60079-32-1:2013 Explosive atmospheres – Part 32-1: Electrostatic hazards, guidance with focus on
clause 7.1.3, 7.1.4, 7.2.1, 7.2.4.
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