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TITANUS
PRO·SENS
®
TECHNICAL MANUAL
2.3.8
Detonation prevention device for endangered areas
Fig. 2.20: Detonation prevention device in the air sampling smoke detection
system and air return system
TITANUS
PRO·SENS
®
can also be used in dangerously explosive areas by
installing a detonation prevention device. Both must be installed outside the
protected area.
To protect a dangerously explosive area a detonation prevention device is
essential, because deflagrations or detonations can result in the TITANUS
PRO·SENS
®
pipe system if vapour/air mixtures should ignite. This depends on
the type, concentration, starter pressure and temperature of the flammable
mixture.
The detonation prevention devices, type PROTEGO EG xx, are flame
breakthrough barriers, resistant to pipe explosions (deflagrations) as well as
resistant to detonations (see fig. 2.20).
During standard operation, the vapour or gas mixtures flow through the
prevention device. The flow direction is interchangeable. If the mixture is ignited
in the primary air sampling system the developing detonation is stopped. The
flame breakthrough (nominal gap width) is avoided by means of the flame
filters. If the mixture ignites near the flame filters, the detonation front could
recoil. In order to avoid this, the minimum pipe length between the mounting
location of the detonation prevention device and the possible ignition source (air
sampling system) must be
1.0 m
. Thus, indirectly, permanent fire prevention is
achieved.