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3.2.2 Permitted materials
EN
WARNING! Explosion risk
• Do not collect material that may cause igni-
tion or blocking. It is strictly prohibited to col-
lect material that may undergo dangerous
chemical or thermal reactions and/or self-ig-
nite.
• Do not make any changes to this product
without consulting Nederman. Adding a relief
duct or changing the spacing or length of fil-
ter elements affects the calculations accord-
ing to EN 14491.
• The filter should not be used for filtering
fumes from welding processes.
WARNING! Risk of personal injury
Use suitable protective equipment: goggles,
ear protection and a protective mask.
It is of the utmost importance to know the
properties of the extracted material.
Some materials may undergo chemical reac-
tions in combination with humidity/water.
Such humidity may, for example, form if the
humidity in the extracted air is condensed in
the filter.
FlexPAK DX is intended to be a part of an extraction
system collecting material with the following proper-
ties:
• MIE (Minimum Ignition Energy): See the product
identification plate.
• MIT (Minimum Ignition Temperature): See the
product identification plate.
• Kst: See the product identification plate.
• Pmax: See the product identification plate.
Materials with properties not within the values stated
above or if a suppression or flameless system is used
are to be investigated prior to use with FlexPAK
800/1000 DX. Contact Nederman for technical sup-
port and dust application investigation.
3.3 Explosion protection
The CE and ATEX markings on this unit ensure both a
high level of safety and protection against ignition of
the collected combustible dust. However, if an explo-
sion occurs due to misuse, insufficient maintenance or
faulty installation, this unit is equipped with addition-
al protection methods to avoid dangerous pressure
build-up in the filter.
FlexPAK 800/1000 DX is equipped with one of the
following protection systems.
• Explosion venting, see Figure 2A.
• Explosion suppression system, see Figure 2B.
• Flameless venting.
20
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FlexPAK 800/1000 DX
3.3.1 Explosion venting
The harmful effects of an explosion are minimized
by venting the pressure and flame of the explosion
through an explosion relief panel, see Figure 2A. In
case of an explosion, the resulting flame and pressure
escape through the explosion relief panel which is to
be directed towards a safe area without any people.
This area is referred to as the 'risk area'.
The risk area is to be clearly marked, for example with
a fence, warning lines and signs, and entry is prohib-
ited when the filter is in operation. The area is to be
free of any flammable or combustible material or oth-
er objects which may be damaged by the flames and
explosion pressure.
The general size of the risk area is shown in Figure 3.
The following dimensions apply:
• A = 10 m (32.8 ft)
• B = 5 m (16.4 ft)
3.3.2 Explosion suppression system
With an explosion suppression system, the early stage
of an explosion is detected with optical and/or pres-
sure-sensitive devices, and an extinguishing agent
is quickly dispersed into the filter, see
suppression of the explosion is initiated an extremely
short time after detection of the explosion (in mil-
liseconds) and stops the pressure rising and extin-
guishes (suppresses) the flames of the explosion.
This ensures that the filter is not stressed to a danger-
ous level by the explosion.
The key components of the explosion suppression
system are the following:
• An explosion detection device (optical/pres-
• A computer-operated control unit.
• Action elements such as pressure cylinders contain-
Detailed information regarding system installation,
function, operation and maintenance can be found in
the suppression system manual.
3.3.3 Flameless venting
The method of flameless venting is similar to method
1 "explosion venting". However, a device attached to
the outside of the vent will stop flames from exiting
the filter vessel. Such a device is sometimes referred
to as a "quench-device" or "flameless-device".
The risk area may extend beyond the values
given above. The final risk area is to be evalu-
ated with regards to affecting factors found in
Standard EN 14491.
For assistance and information, contact Neder-
man.
sure-sensitive).
ing an extinguishing agent with an extra fast open-
ing valve.
Figure 2B
The
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