ALF-13150-E-01
All-Flo
22
ATEX PROTECTION SUMMARY
POTENTIAL IGNITION
SOURCE
CAUSE
DESCRIPTION OF PROTECTION MEASURES APPLIED
Hot Surface
Friction between stationary
and moving parts
The maximum surface temperature of the equipment does
not depend on the equipment itself, but mainly the process.
The relevant information has been given in the instructions
for use and the equipment has been marked T6-T3 in order
to inform the user about this special situation.
Hot Surface
Ingress of Dust
Equipment passed IP 5X testing, removing risk during
normal operation. Equipment functions under positive
pressure or no vacuum during normal operation due to
no heat production (therefore, breathing effects are not
present). Due to two means of dust ingress protection listed
above, ingress is only considered possible during
rare malfunction, which is acceptable for Category 2D.
Hot Surface
Friction between stationary
and moving parts
The only moving parts that can cause frictional heat are
located in the air valve assembly. Testing was performed to
show the air valve assembly does not heat up during use.
Also, the air acts as a heat exchanger when passing through
the assembly.
Hot Surface
Friction between stationary
and moving parts (air valve
assembly)
While in use, there is a constant air flow over the moving
parts within the valve assembly, acting as a heat exchanger
that cools the air valve assembly and prevents overheating.
The equipment cannot run without compressed air.
Hot Surface
Insulation effects due to dust
layering
Due to no heat rise during normal operation, there is no
additional heat rise due to dust layering. Testing shows
equipment has no heat rise during normal operation.
Flames and Hot Gases
Overheating of non-metallic
materials
The maximum allowed temperature for the process fluid
is dependent upon the material used in the equipment.
Certificate and warning markings include temperature
limitations for non-metallic materials.
Mechanical Generated
Sparks (Impact/Friction)
Friction between stationary
and moving parts
The moveable parts within the air valve assembly that can
make contact with other parts are all non-metallic. There is
no metal-to-metal action in the assembly.
Mechanical Generated
Sparks (Impact/Friction) Undue Vibration
Mounting feet can be used to reduce vibration. End user
to ensure installation instructions are followed from the
Installation, Operation and Maintenance manual.
Static Electricity
Fluid (air or liquid) being
pumped
All external non-metallic materials have been surface
resistance tested. Internal non-metallic materials’ projected
area are in acceptable ranges for use in Group II. Condition of
use applied for ambient conditions greater than 30% Relative
Humidity.
Adiabatic Compression
and Shock Waves
High temperatures from
adiabatic shock waves
Equipment has been overpressure tested, showing it can
withstand high pressure. Therefore, adiabatic shock will not
occur without a rare malfunction.
10
SECTION
