Re: explosion suppression systems

Date:         05 Aug 97 03:15:48 
From:         gfoley@freenet.columbus.oh.us (Gerard Foley)
Organization: The Greater Columbus FreeNet
References:   1
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PFAFFENBERGER, SIEGFRIED (SIEGFRIED.PFAFFENBERGER@LHT.DLH.DE) wrote:
: i remember that in the late 60's airplanes like the boeing 707 and 720B,
: maybe also the 727 were equipped with an explosion suppression system
: manufactured by a company with the name fenwal or similar. The system
: sensed the onset of an explosion (early flame front) and reacted
: supposedly fast enough to prevent further progress by triggering a
: cartridge with a chemical inerting the surrounding air due to its strong
: affinity to oxygen. the system was definitely much cheaper and lighter
: than any of the systems discussed now for retrofit in connection with
: twa 800.

This explanation of the action of a fire suppressing system does not
sound correct.  A chemical with a strong affinity for oxygen is one
which burns easily - combustion is, in one view, the removal of
oxygen from air by combining it with some other element (carbon,
hydrogen...) to form an oxide.  The chemical described would seem
just to nourish the fire.

Fenwal was the name of a company which made, among other things,
thermostats.  I think they were also in the Fire Prevention or
protection business.

: This system apparently is no longer used. does anyone know for what
: reason? was there a basic flaw?

Don't know anything for a fact.  Sorry

--
Gerry