Explosion Protection; Method 1: Explosion Relief Venting; Method 2: Explosion Suppression System - Nederman FlexFilter EX Manual De Instrucciones

8

Explosion protection

The CE and ATEX marking on the FlexFilter EX ensure both a high level of safety
and protection against ignition of possible explosive atmospheres. However,
if an explosion occurs due to misuse, insufficient maintenance or faulty
installation, the FlexFilter EX is equipped with additional protection methods
to avoid dangerous pressure build up in the filter.
The FlexFilter EX comes equipped with either an Explosion Relief Panel, or an
Explosion Suppression System.
The Suppression System is normally only used if venting is impossible due to
the placement of the filter, dangerous material properties or resulting flame
and pressure risk area.
8.1

Method 1: Explosion relief venting

The harmful effects of an explosion are minimised by venting the pressure and
flame of the explosion via a relief panel. In case of an explosion, the resulting
flame and pressure escapes out the relief panel which must be directed to a
safe, unmanned area. This area will be referred to as the "risk area"
The risk area must be clearly marked, for example with a fence, warning lines
and signs, and is to be off limits during the time the filter is in operation. The
area shall be free of any flammable or combustible material or other things in
danger of being damaged by the flames and explosion pressure.
The general size of the risk area with or without deflector (accessory) is shown
on picture no. 9. As a general rule the following dimensions apply:
A) 12 m (39.4 ft)
B) 3 m (9.8 ft)
C) 5 m (16.4 ft)
D) 6 m (19.7 ft)
E) 6 m (19.7 ft)
F) 6 m (19.7 ft)
G) 6 m (19.7 ft)
NOTE! The risk area can extend beyond above given values. Final risk area
must be evaluated with regards to affecting factors found in standard EN
14491.
8.2

Method 2: Explosion suppression system

With an Explosion Suppression System, the early stage of an explosion is
detected with optical and/or pressure devices, and an extinguishing agent is
quickly dispersed into the filter. The suppression of the explosion is initiated
in an extremely short time after explosion's detection (in milliseconds), and
stops the pressure rise and extinguishes (suppresses) the flame/flames of the
explosion.
This ensures that the filter is not stressed to a dangerous level by the
explosion.
FlexFilter EX EN
39