泡沫消防系統(tǒng)外文翻譯(存儲版)
【正文】 /8英寸噴嘴和 5/2英寸光滑橡膠襯里軟管時，標準滅火水流流量是 250 加侖 /分。 (2)空氣（提供燃料用的氧氣）必須以恰當?shù)谋壤c燃料構(gòu)成能引燃的混合物。 (3)必須存在引燃源（足以引起燃燒這種化學反應的高溫和能量）。該標準水流要求噴嘴壓力約為 45磅 /英寸 2 ，若噴嘴于消防栓間采用 400英寸軟管，則要求消防栓壓力為 105 磅 /英寸 2 。 ：泡沫溶液內(nèi)充空氣后的充氣混合物，能形成窒息火災的覆蓋 層。這種溶液仍以高速流動形成真空 吸入空氣后，泡沫溶液膨脹 8到 10 倍。根據(jù)所采用的器械和泡沫劑溶液，常用泡沫生產(chǎn)設備獲得的膨脹比范圍為 6： 1 至12： 1，比較所生產(chǎn)的泡沫體積與生產(chǎn)該體積泡沫所需溶液體積就可測出膨脹率。固定式系統(tǒng) 包括泡沫劑儲罐、泡沫泵、比例混合系統(tǒng)，以及接至設備和構(gòu)件的管線和泡沫排放裝置。 這種系統(tǒng)的 優(yōu)點是： ，能照顧到整個站庫； ； ；。系統(tǒng)中具有泡沫支管，它從防火堤外接 至油罐基礎處。一般的工藝是在離密封區(qū)約一英尺處安裝環(huán)狀泡沫堰板，并在圍繞罐壁的背板上安裝小型泡沫發(fā)生器及排放裝置。 ，所有可在各個油庫、市政當局和泡沫制造廠之間應有相互支援的計劃。 在錐頂罐上，往罐內(nèi)導入泡沫的泡沫室安裝在低于灌頂角鋼的管壁四周。 移動式系統(tǒng)可以由車載和人工移動設備組合而成。固定系統(tǒng)應用在設有大型儲罐的地方，如大型海上轉(zhuǎn)輸站或散裝儲油庫。 泡沫覆蓋層的隔熱性能與泡沫層的穩(wěn)定性及水在泡沫中的存留量有關(guān)。 有效地使用泡沫要求泡沫以一種穩(wěn)定的覆蓋層覆蓋在燃燒液體的表面。 水成膜泡沫時美國海軍為撲滅突發(fā)性火災而開發(fā)的，對流散火災非常有效。 壓力不夠時，就要安裝消防泵。切斷燃料或空氣通常就能滅火。oating on the water surface may actually spread the fire. Water is of assistance in keeping adjacent tanks and buildings cool. Water fog,a finely divided spray, is useful in shutting off air from burning oil surface and cooling it below ignition fog is effective on viscous oils or high flash oils in areas that are within the range of the spray. A standard fire stream is rated at about 250 gpm using a in. nozzle and in. smooth rubber lined hose. This standard stream will require a nozzle pressure of about 45 psi with a hydrant pressure of 105 psi using 400 feet of hose between hydrant snd nozzle. A main distribution pressure of 125 psi for hose streams and foam generation is adequate. When pressure is inadequate, fire pumps are installed. Pumps in the 500 to 1500 gpm are normally used. Standby pumps, usually diesel engine driven are provided for use in large facilities or when electrical power may be lost during a fire. Fire Fighting Systems The principal of foam application is to cover a burning oil surface with abblanket that will exclude air and smother the. Here are some basic definitions. (1)Foam Concentratea chemical which when mixed with water can be acrated and expanded to form foam. (2)Foam Solutionthe mixture of foam concentrate and water in proper proportions, usually about 310% foam concentrate. (3)Foam – the aerated mixture of foam solution that is made up of air filled bubbles that form a blanket to smother fire. The most pertinent developments with respect to types of foam include the following: (1)protein foam concentrate (2)fluoroprotein foam (3)aqueous film forming foams(AFFF) AFFF was developed by the . navy for crash fires and is very effctive on spill AFFF is bined with dry
畢業(yè)設計相關(guān)推薦
鄂ICP備17016276號-1