Safety Through Training and Assessment

TechKnowCon

Test Report

In the event of fire released particles travel in the air ventilating  the mine. Because of the high volume of air needed to ventilate the mine CO gas can not be generated in the early stage of a fire. This report shows the response of  a Smoke and a CO gas detectors when exposed to the same source.

Some mines are using large quantities of wood for roof support. A soldering ion with a temperature of approximately 350 deg Celsius was used to burn wood. The test showed that the smoke detector responded immediately and that there was no response from the CO gas detector.

Smoke versus CO gas detection

Response to Smoldering Wood

Response to Smoldering Duff—Conveyor Belt Fire

The CO gas detector did not respond in the test where the contact between the cloth and the hot element had been isolated from air. The Smoke detector responded immediately to the particles released from the burning cloth.

Fire can easily be started by friction between materials.

The results of test show clearly that the smoke detector is extremely sensitive to the particles released in the process. No response from the CO gas detector.

Response to Wood Friction

The smoke detector is extremely sensitive to the release of  particles when electrical equipment and cables are overloaded and can produce a warning even before the start of a fire. Ideal for the detection of fire in substations and cable trenches. No response from the CO gas detector.

Response to Electrical Fire

To show that the CO detector was functioning, matches was burned inside the shield of the detector where the flame could be starved from oxygen and generate CO gas. The 200ppm CO gas detector saturated giving a 100% signal output showing that it was responding to CO gas.

CO Detector Test

Response to Friction on Rubber

Fire can easily be started by friction on rubber components.– Vehicle Tires, Conveyor Belting.

The results of test show  that the smoke detector is extremely sensitive to the particles released in the friction process. No response from the CO gas detector.