長春輸油氣分公司完成農安輸油站所轄管道慶鐵三線和慶鐵四線陰極保護檢查片的埋設與安裝工作，標志著管道陰極保護檢查片在長春分公司“上崗”。
管道斷電電位是評價陰極保護效果的重要指標。受限于技術手段，管道公司在日常管理中測量的電位均為通電電位，難以對管道陰極保護效果進行準確評價。為此，管道公司管道處組織研發了管道陰極保護檢查片。陰極保護檢查片既可作為陰極保護斷電電位評價，又可通過觀察檢查片的腐蝕情況對檢查片的陰極保護效果進行定性評價。與以往直接通過測試樁測量保護電位相比，檢查片測量的斷電電位更能反映管道陰極保護效果，操作簡單，拆卸方便。
陰(yin)極(ji)保(bao)(bao)(bao)護(hu)(hu)電(dian)(dian)(dian)位檢(jian)(jian)查(cha)片(pian)(pian)是用(yong)于(yu)(yu)模擬被調(diao)查(cha)管(guan)道(dao)(dao)(dao)陰(yin)極(ji)極(ji)化后電(dian)(dian)(dian)位的(de)(de)檢(jian)(jian)查(cha)片(pian)(pian)，將其(qi)埋設(she)在管(guan)道(dao)(dao)(dao)測試點處(chu)，檢(jian)(jian)查(cha)片(pian)(pian)部分露出，其(qi)余(yu)部分有防(fang)腐(fu)層，檢(jian)(jian)查(cha)片(pian)(pian)的(de)(de)埋設(she)狀態、材質均與(yu)管(guan)道(dao)(dao)(dao)相同，通過電(dian)(dian)(dian)纜與(yu)管(guan)道(dao)(dao)(dao)連接起來，這(zhe)樣檢(jian)(jian)查(cha)片(pian)(pian)的(de)(de)裸露部分就模擬了管(guan)道(dao)(dao)(dao)的(de)(de)一個防(fang)腐(fu)層漏點。當(dang)管(guan)道(dao)(dao)(dao)處(chu)于(yu)(yu)陰(yin)極(ji)保(bao)(bao)(bao)護(hu)(hu)狀態時，管(guan)道(dao)(dao)(dao)被保(bao)(bao)(bao)護(hu)(hu)電(dian)(dian)(dian)流極(ji)化的(de)(de)同時，檢(jian)(jian)查(cha)片(pian)(pian)也會(hui)被極(ji)化為(wei)與(yu)管(guan)道(dao)(dao)(dao)相同的(de)(de)程度，只需測量檢(jian)(jian)查(cha)片(pian)(pian)的(de)(de)瞬時斷(duan)開(kai)電(dian)(dian)(dian)位，即可代表管(guan)道(dao)(dao)(dao)測量點的(de)(de)斷(duan)電(dian)(dian)(dian)電(dian)(dian)(dian)位。NACE SP0502-2010《管(guan)道(dao)(dao)(dao)外腐(fu)蝕直接評(ping)價方(fang)法》認為(wei)檢(jian)(jian)查(cha)片(pian)(pian)的(de)(de)斷(duan)電(dian)(dian)(dian)電(dian)(dian)(dian)位近似于(yu)(yu)管(guan)道(dao)(dao)(dao)防(fang)腐(fu)層漏點處(chu)的(de)(de)陰(yin)極(ji)保(bao)(bao)(bao)護(hu)(hu)電(dian)(dian)(dian)位，能夠評(ping)估管(guan)道(dao)(dao)(dao)陰(yin)極(ji)保(bao)(bao)(bao)護(hu)(hu)效(xiao)果。
