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消防電子報資料庫首頁 :: 消防英文
 
Preventing flashovers
-- 預防閃燃
文/曾郁青

Flashovers may be prevented in two ways.(閃燃可以藉由2種方式來預防。)

Proper ventilation can prevent a flashover. Venting allows superheated air and fuel-loaded fire gases to escape the room or area.(適當的通風排煙可以預防閃燃,可使高溫空氣和可燃性火煙離開該房間或區域。)


This can be done by horizontal or vertical ventilation. Reducing the heated ceiling layer reduces the thermal radiation feedback and the possibility of flashover.(通風排煙有水平或垂直兩種方式,減少靠近天花板之熱煙層可以降低熱輻射回饋和閃燃發生的可能性。)

It is important to note that venting the fire gases should not expose firefighters to injury or spread heat and smoke to uninvolved areas of the building.(值得特別注意的是,排出的火煙不應使現場消防員受傷或散佈至建築物未受影響之區域。)

This could increase the expansion fire problem if those gases were to ignite.(如果這些可燃性氣體被點燃,可能會造成延燒問題。)

The second way to reduce the possibility of flashover is to cool the fire area with a hose stream.(第2個減少閃燃發生可能性的方式是使用水線來冷卻火場。)

Most of us have been taught never to open the hoseline on smoke. This is true. But just as we were told that, weren’t we told there are no “nevers” in the fire service? This also is true.(我們大多數人都被教導永遠不要對煙霧射水,這是真的。但正如我們被告知的那樣,難道我們不是被教導在消防中沒有「永遠不」嗎? 這也是事實。)

The reason you can open the line on smoke in this situation is that the black-black smoke, a warning sign of flashover, is called “black fire”.(在這種情況下,你可以對煙霧射水的原因是看到黑色的濃煙,也就是閃燃即將發生的徵兆,被稱為「黑火」。)

If you see that black smoke and feel the rapid heat rise through your bunker gear, even if you can’t see the rollover, you must open the line on the “black fire”.(如果你看到黑色濃煙並感覺到你的防護裝備迅速升溫,即使你看不到滾燃,也必須打開水線對「黑火」射水。)

This will reduce the possibility of flashover. This is an emergency situation, and the hoseline can be operated in this manner.(這樣可以減少閃燃發生的可能性,這是緊急狀況且水線可以用此方式操作。)







註:本文相關內容來自https://www.usfa.fema.gov/(本專欄內容可能與我國消防現況有所出入,僅供學習消防英文參考使用。)


(108年7月5日 )
 
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