燃氣(qi)(qi)(qi)(qi)(qi)過濾器一旦(dan)發生(sheng)報警應盡快斷電(dian)(dian)，檢(jian)(jian)查(cha)下(xia)水道(dao)(dao)(dao)等地溝沼氣(qi)(qi)(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)干擾(rao)。這是(shi)(shi)最(zui)常見的(de)(de)(de)(de)(de)(de)一種誤報警。解決的(de)(de)(de)(de)(de)(de)辦法(fa)(fa)(fa)(fa)是(shi)(shi)首(shou)先(xian)詢 問(wen)最(zui)近的(de)(de)(de)(de)(de)(de)住戶或物業，指(zhi)明下(xia)水道(dao)(dao)(dao)的(de)(de)(de)(de)(de)(de)準確位置(zhi)，以了(le)解管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)同下(xia)水道(dao)(dao)(dao)的(de)(de)(de)(de)(de)(de)距離(li)關系，從而設定 苦干鉆孔點(dian)(dian)，最(zui)后通過對(dui)氣(qi)(qi)(qi)(qi)(qi)體的(de)(de)(de)(de)(de)(de)濃度(du)(du)檢(jian)(jian)測(ce)來判斷是(shi)(shi)否(fou)為(wei)(wei)(wei)(wei)漏點(dian)(dian)。 排(pai)除相鄰(lin)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)洞點(dian)(dian)的(de)(de)(de)(de)(de)(de)干擾(rao)。若確定漏點(dian)(dian)并(bing)開挖后發現(xian)目標(biao)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)完好無損(sun)，在(zai)其(qi)他 可(ke)能的(de)(de)(de)(de)(de)(de)干擾(rao)都排(pai)除后，就要考(kao)慮相鄰(lin)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)泄(xie)漏的(de)(de)(de)(de)(de)(de)可(ke)能。 當(dang)在(zai)復雜管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)地區(qu)測(ce)量(liang)深(shen)(shen)(shen)(shen)度(du)(du)時，可(ke)采用重復測(ce)量(liang)的(de)(de)(de)(de)(de)(de)方(fang)法(fa)(fa)(fa)(fa)測(ce)深(shen)(shen)(shen)(shen)，若重復性好則測(ce)探(tan)結 果可(ke)信。 燃氣(qi)(qi)(qi)(qi)(qi)查(cha)漏檢(jian)(jian)測(ce)儀(yi)器可(ke)配合防(fang)腐(fu)層(ceng)(ceng)檢(jian)(jian)測(ce)儀(yi)器同時使用，起到雙保險(xian)的(de)(de)(de)(de)(de)(de)作用、這樣(yang)檢(jian)(jian)測(ce) 結果的(de)(de)(de)(de)(de)(de)準確串較高。檢(jian)(jian)測(ce)人員根(gen)據(ju)作業不同點(dian)(dian)的(de)(de)(de)(de)(de)(de)電(dian)(dian)流值(zhi)判斷管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)防(fang)腐(fu)層(ceng)(ceng)是(shi)(shi)否(fou)有破(po)損(sun)，同時 根(gen)據(ju)氣(qi)(qi)(qi)(qi)(qi)體檢(jian)(jian)測(ce)儀(yi)的(de)(de)(de)(de)(de)(de)檢(jian)(jian)測(ce)數值(zhi)判斷管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)是(shi)(shi)否(fou)泄(xie)漏。 第八節 煙氣(qi)(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)迢的(de)(de)(de)(de)(de)(de)防(fang)腐(fu)層(ceng)(ceng)檢(jian)(jian)測(ce) 管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)腐(fu)蝕(shi)可(ke)分為(wei)(wei)(wei)(wei)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)內腐(fu)蝕(shi)和外腐(fu)蝕(shi)，其(qi)中(zhong)外腐(fu)蝕(shi)是(shi)(shi)破(po)壞燃氣(qi)(qi)(qi)(qi)(qi)管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)的(de)(de)(de)(de)(de)(de)主要因素，埋(mai)地 鋼(gang)管(guan)(guan)(guan)(guan)(guan)防(fang)腐(fu)系統出現(xian)問(wen)題，例如(ru)防(fang)腐(fu)層(ceng)(ceng)出現(xian)破(po)損(sun)點(dian)(dian)、局部老化(hua)及失效等故障，管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)會(hui)發生(sheng)大氣(qi)(qi)(qi)(qi)(qi)、 土壤、電(dian)(dian)化(hua)學腐(fu)蝕(shi)，嚴重時會(hui)發生(sheng)腐(fu)蝕(shi)穿孔。將(jiang)探(tan)頭 沿垂(chui)直(zhi)管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)方(fang)向(xiang)一側移動，找(zhao)出信號(hao)(hao)(hao)(hao)最(zui)小的(de)(de)(de)(de)(de)(de)位量(liang)B，設管(guan)(guan)(guan)(guan)(guan)道(dao)(dao)(dao)中(zhong)心為(wei)(wei)(wei)(wei)o，這樣(yang)AABo為(wei)(wei)(wei)(wei)一等腰 直(zhi)角三角形，所以AB＝AO即(ji)為(wei)(wei)(wei)(wei)管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)埋(mai)深(shen)(shen)(shen)(shen)。45。法(fa)(fa)(fa)(fa)測(ce)深(shen)(shen)(shen)(shen)原理(li)見圖(tu)6—19。 2．80％法(fa)(fa)(fa)(fa)測(ce)深(shen)(shen)(shen)(shen) 利用極(ji)大值(zhi)法(fa)(fa)(fa)(fa)找(zhao)出管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)位置(zhi)A，并(bing)記下(xia)探(tan)管(guan)(guan)(guan)(guan)(guan)儀(yi)接(jie)收的(de)(de)(de)(de)(de)(de)信號(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)但，將(jiang)探(tan)頭垂(chui)直(zhi)于管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian) 并(bing)沿著管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)方(fang)向(xiang)分別向(xiang)兩側移動，注意(yi)主顯示宙(zhou)口中(zhong)信號(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)的(de)(de)(de)(de)(de)(de)變化(hua)，找(zhao)出信號(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)為(wei)(wei)(wei)(wei)A處 80％的(de)(de)(de)(de)(de)(de)點(dian)(dian)B和點(dian)(dian)c，則距離(li)Bc即(ji)為(wei)(wei)(wei)(wei)管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)埋(mai)深(shen)(shen)(shen)(shen)。80％法(fa)(fa)(fa)(fa)測(ce)深(shen)(shen)(shen)(shen)原理(li)見圖(tu)6—20。 3．極(ji)值(zhi)法(fa)(fa)(fa)(fa)測(ce)深(shen)(shen)(shen)(shen) 利用極(ji)小值(zhi)法(fa)(fa)(fa)(fa)找(zhao)出管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)的(de)(de)(de)(de)(de)(de)位置(zhi)A，將(jiang)探(tan)頭沿垂(chui)直(zhi)管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)方(fang)向(xiang)向(xiang)一側移動，注意(yi)主顯示窗(chuang)口 中(zhong)信號(hao)(hao)(hao)(hao)強(qiang)(qiang)度(du)(du)的(de)(de)(de)(de)(de)(de)變化(hua)，找(zhao)出信號(hao)(hao)(hao)(hao)最(zui)強(qiang)(qiang)處點(dian)(dian)B，則B點(dian)(dian)與管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian)在(zai)地面投影的(de)(de)(de)(de)(de)(de)垂(chui)線(xian)(xian)(xian)段(duan)AB即(ji)為(wei)(wei)(wei)(wei)管(guan)(guan)(guan)(guan)(guan)線(xian)(xian)(xian) 的(de)(de)(de)(de)(de)(de)深(shen)(shen)(shen)(shen)度(du)(du)。