燃(ran)氣(qi)(qi)(qi)過濾器(qi)(qi)(qi)一(yi)(yi)旦發(fa)生(sheng)報警(jing)應盡快斷電(dian)，檢(jian)查下水道(dao)等地溝沼(zhao)氣(qi)(qi)(qi)的(de)(de)(de)(de)干擾(rao)(rao)。這(zhe)是(shi)(shi)最(zui)(zui)常見(jian)(jian)的(de)(de)(de)(de)一(yi)(yi)種誤報警(jing)。解(jie)決的(de)(de)(de)(de)辦(ban)法(fa)(fa)是(shi)(shi)首(shou)先詢 問最(zui)(zui)近的(de)(de)(de)(de)住戶(hu)或(huo)物業，指明(ming)下水道(dao)的(de)(de)(de)(de)準(zhun)確位(wei)置，以(yi)了解(jie)管(guan)(guan)(guan)(guan)(guan)道(dao)同(tong)(tong)下水道(dao)的(de)(de)(de)(de)距離關系，從而設(she)定 苦干鉆孔(kong)點(dian)(dian)(dian)，最(zui)(zui)后(hou)通過對氣(qi)(qi)(qi)體(ti)(ti)的(de)(de)(de)(de)濃度(du)(du)檢(jian)測(ce)(ce)(ce)(ce)來判(pan)斷是(shi)(shi)否為漏(lou)點(dian)(dian)(dian)。 排除(chu)相鄰管(guan)(guan)(guan)(guan)(guan)道(dao)洞點(dian)(dian)(dian)的(de)(de)(de)(de)干擾(rao)(rao)。若(ruo)確定漏(lou)點(dian)(dian)(dian)并開(kai)挖(wa)后(hou)發(fa)現目標管(guan)(guan)(guan)(guan)(guan)道(dao)完好無損，在其他 可(ke)(ke)能(neng)的(de)(de)(de)(de)干擾(rao)(rao)都排除(chu)后(hou)，就要(yao)考慮相鄰管(guan)(guan)(guan)(guan)(guan)道(dao)泄漏(lou)的(de)(de)(de)(de)可(ke)(ke)能(neng)。 當在復(fu)雜管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)地區測(ce)(ce)(ce)(ce)量深(shen)(shen)(shen)度(du)(du)時(shi)，可(ke)(ke)采用重(zhong)復(fu)測(ce)(ce)(ce)(ce)量的(de)(de)(de)(de)方(fang)法(fa)(fa)測(ce)(ce)(ce)(ce)深(shen)(shen)(shen)，若(ruo)重(zhong)復(fu)性好則測(ce)(ce)(ce)(ce)探(tan)(tan)結 果可(ke)(ke)信(xin)。 燃(ran)氣(qi)(qi)(qi)查漏(lou)檢(jian)測(ce)(ce)(ce)(ce)儀(yi)(yi)器(qi)(qi)(qi)可(ke)(ke)配合(he)防腐(fu)(fu)(fu)層(ceng)檢(jian)測(ce)(ce)(ce)(ce)儀(yi)(yi)器(qi)(qi)(qi)同(tong)(tong)時(shi)使(shi)用，起到雙保險(xian)的(de)(de)(de)(de)作用、這(zhe)樣(yang)檢(jian)測(ce)(ce)(ce)(ce) 結果的(de)(de)(de)(de)準(zhun)確串較高。檢(jian)測(ce)(ce)(ce)(ce)人員(yuan)根(gen)據(ju)(ju)作業不(bu)同(tong)(tong)點(dian)(dian)(dian)的(de)(de)(de)(de)電(dian)流值(zhi)判(pan)斷管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)防腐(fu)(fu)(fu)層(ceng)是(shi)(shi)否有破(po)損，同(tong)(tong)時(shi) 根(gen)據(ju)(ju)氣(qi)(qi)(qi)體(ti)(ti)檢(jian)測(ce)(ce)(ce)(ce)儀(yi)(yi)的(de)(de)(de)(de)檢(jian)測(ce)(ce)(ce)(ce)數值(zhi)判(pan)斷管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)是(shi)(shi)否泄漏(lou)。 第(di)八節 煙氣(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)迢的(de)(de)(de)(de)防腐(fu)(fu)(fu)層(ceng)檢(jian)測(ce)(ce)(ce)(ce) 管(guan)(guan)(guan)(guan)(guan)道(dao)腐(fu)(fu)(fu)蝕(shi)可(ke)(ke)分(fen)為管(guan)(guan)(guan)(guan)(guan)道(dao)內(nei)腐(fu)(fu)(fu)蝕(shi)和外腐(fu)(fu)(fu)蝕(shi)，其中(zhong)外腐(fu)(fu)(fu)蝕(shi)是(shi)(shi)破(po)壞燃(ran)氣(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)道(dao)的(de)(de)(de)(de)主要(yao)因素，埋地 鋼管(guan)(guan)(guan)(guan)(guan)防腐(fu)(fu)(fu)系統出現問題(ti)，例(li)如防腐(fu)(fu)(fu)層(ceng)出現破(po)損點(dian)(dian)(dian)、局部(bu)老化及失效(xiao)等故(gu)障，管(guan)(guan)(guan)(guan)(guan)道(dao)會(hui)(hui)發(fa)生(sheng)大(da)氣(qi)(qi)(qi)、 土壤(rang)、電(dian)化學腐(fu)(fu)(fu)蝕(shi)，嚴重(zhong)時(shi)會(hui)(hui)發(fa)生(sheng)腐(fu)(fu)(fu)蝕(shi)穿孔(kong)。將(jiang)探(tan)(tan)頭(tou) 沿垂直管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)方(fang)向(xiang)一(yi)(yi)側移動(dong)，找(zhao)(zhao)出信(xin)號(hao)最(zui)(zui)小的(de)(de)(de)(de)位(wei)量B，設(she)管(guan)(guan)(guan)(guan)(guan)道(dao)中(zhong)心(xin)為o，這(zhe)樣(yang)AABo為一(yi)(yi)等腰 直角(jiao)三角(jiao)形，所以(yi)AB＝AO即為管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)埋深(shen)(shen)(shen)。45。法(fa)(fa)測(ce)(ce)(ce)(ce)深(shen)(shen)(shen)原理見(jian)(jian)圖6—19。 2．80％法(fa)(fa)測(ce)(ce)(ce)(ce)深(shen)(shen)(shen) 利(li)用極大(da)值(zhi)法(fa)(fa)找(zhao)(zhao)出管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)的(de)(de)(de)(de)位(wei)置A，并記下探(tan)(tan)管(guan)(guan)(guan)(guan)(guan)儀(yi)(yi)接收的(de)(de)(de)(de)信(xin)號(hao)強度(du)(du)但，將(jiang)探(tan)(tan)頭(tou)垂直于管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian) 并沿著管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)方(fang)向(xiang)分(fen)別(bie)向(xiang)兩側移動(dong)，注(zhu)意主顯(xian)(xian)示宙(zhou)口中(zhong)信(xin)號(hao)強度(du)(du)的(de)(de)(de)(de)變化，找(zhao)(zhao)出信(xin)號(hao)強度(du)(du)為A處 80％的(de)(de)(de)(de)點(dian)(dian)(dian)B和點(dian)(dian)(dian)c，則距離Bc即為管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)的(de)(de)(de)(de)埋深(shen)(shen)(shen)。80％法(fa)(fa)測(ce)(ce)(ce)(ce)深(shen)(shen)(shen)原理見(jian)(jian)圖6—20。 3．極值(zhi)法(fa)(fa)測(ce)(ce)(ce)(ce)深(shen)(shen)(shen) 利(li)用極小值(zhi)法(fa)(fa)找(zhao)(zhao)出管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)的(de)(de)(de)(de)位(wei)置A，將(jiang)探(tan)(tan)頭(tou)沿垂直管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)方(fang)向(xiang)向(xiang)一(yi)(yi)側移動(dong)，注(zhu)意主顯(xian)(xian)示窗口 中(zhong)信(xin)號(hao)強度(du)(du)的(de)(de)(de)(de)變化，找(zhao)(zhao)出信(xin)號(hao)最(zui)(zui)強處點(dian)(dian)(dian)B，則B點(dian)(dian)(dian)與管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)在地面投影的(de)(de)(de)(de)垂線(xian)(xian)(xian)段AB即為管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian) 的(de)(de)(de)(de)深(shen)(shen)(shen)度(du)(du)。