Nederman E-PAK 300 DX Manuel D'instruction page 29

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NOTE!
The risk area may extend beyond the values given above. The
final risk area is to be evaluated with regards to affecting factors found in
Standard EN 14491.
4.1.2 Method 2: Explosion suppression system
With an explosion suppression system, the early stage of an explosion is
detected with optical and/or pressure-sensitive devices, and an extinguishing
agent is quickly dispersed into the filter. The suppression of the explosion
is initiated an extremely short time after detection of the explosion (in
milliseconds), and stops the pressure rising and extinguishes (suppresses) the
flames of the explosion.
This ensures that the filter is not stressed to a dangerous level by the explosion.
The key components of the explosion suppression system are the following:
• An explosion detection device (optical/pressure-sensitive).
• A computer-operated control unit.
• Action elements such as pressure cylinders containing an extinguish agent
with an extra fast opening valve.
Detailed information regarding system installation, function, operation and
maintenance can be found in the suppression system manual.
4.1.3 Isolation device
An isolation device, see Figure 9, item 5, is to be installed to prevent a filter
explosion from propagating back into the plant through the connected duct.
The duct, see Figure 9, item 8, between the unit and the isolation device is to
be pressure-resistant to an overpressure of at least 0.5 bar (7.2 PSI) and have a
minimum length (Figure 9, item A) as specified in the manual of the isolation
device.
5 Description
5.1 Function
E-PAK 150 DX/300 DX/500 DX has been designed to filter combustible and
non-combustible dust in a high vacuum system.
E-PAK 150 DX/300 DX/500 DX is a complete vacuum unit with a direct-
driven side channel fan fitted as one unit on a steel frame and a start and
control unit with an integrated 24 V transformer. E-PAK 150 DX is direct
started, while E-PAK 300 DX/500 DX are Y/D started. The unit has automatic
start/stop and automatic filter cleaning in two stages.
Filtration in two stages
In the first stage, the inlet separates course particles. In the second stage, fine
particles are separated on conductive filter bags.
Automatic filter cleaning
E-PAK 150 DX/300 DX/500 DX uses filter cleaning by a short blast of reversed
air flow with atmospheric pressure. By the rapid opening of the filter cleaning
valve located on top of the filter, a powerful blast of reversed air flow is
created, efficiently dislodging dust from the filter bags.
E-PAK 150 DX/300 DX/500 DX EN
29