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Actical thermography of fire extinguishing process by the device using high speed flow of fire extinguishing agent

Journal: Pozharovzryvobezopastnost/Fire and Explosion Safety (Vol.26, No. 3)

Publication Date:

Authors : ;

Page : 51-59

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Abstract

Positive experience of fire tests thermography is proposed to be extended over testing of fire equipment when the application tactics of fire extinguishing devices is primarily important because of the limited mass and flow rate of fire extinguishing substances, and inappropriate use of technical opportunities which may result in low efficiency of fire extinguishing. As tools of objective control “IRTIS” thermographs were used which are insensitive to interferences and maintain the accuracy of data recorded with high smoke-forming ability of the materials of fire. Means of augmented reality applied to control testing of fire equipment to extinguish fire models. It is shown that observations in the spectral range of infrared radiation of 3…5 μm ensured orientation and targeting in the complete absence of visibility. The corresponding thermograms revealed changes in the combustion process due to the flow of extinguishing agent in the form finely sprayed flow and compact jet. Evaluation of fire extinguishing dynamics was done based upon the results of registered temperature anomalies and average temperatures of the central as well as extended zones of combustion. It was established that instrumental control makes available the synchronization of the suppression of the combustion process, adaptation of techniques and provides a significant increase in the efficiency of fire extinguishing. Based on the thermography data, recommendations were developed for the device using high speed flow of fire extinguishing agent “KLIN”. Objective functions to combine tactical thermography with the use of the tested device are outlined. They include: priority for further action of finely dispersed curtain to reduce controlled thermal radiation and to allow reduction of the distance and following close action with the suppression of controlled temperature anomalies of the compact high-speed supply of fire extinguishing substances at the final stage of extinguishing the fire. It is noted that extinguishing of standard fire models is possible after one or two exercises because uniformity of burning allows to quickly identify necessary and sufficient techniques. More complex scenarios which are close to reality, take place when fighting non-standard fires, which are different from the standard ones by random distribution of zones of different intensity of combustion and random distribution of the closed areas, difficult to reach for the extinguishing substance. Extinguishing of these fires require adaptive use of fire equipment, that's why thermographic control of the burn is recommended in non-standard conditions.

Last modified: 2018-10-17 21:17:09