石油化工腐蚀与防护
石油化工腐蝕與防護
석유화공부식여방호
PETROCHEMICAL CORROSION AND PROTECTION
2011年
6期
46-49
,共4页
徐承伟%滕延平%蔡永军%蔡培培%蒋国辉%杨士梅%许卓
徐承偉%滕延平%蔡永軍%蔡培培%蔣國輝%楊士梅%許卓
서승위%등연평%채영군%채배배%장국휘%양사매%허탁
阳极地床%阴极保护%电压升
暘極地床%陰極保護%電壓升
양겁지상%음겁보호%전압승
anode bed%cathodic protection%voltage rise
管地电位为衡量管道是否得到足够阴极保护的重要评价指标,但在日常管理工作中,阴保站附近经常会出现管地电位过负的问题,这为管道的安全运行带来一定隐患。以秦皇岛首站附近管道为研究对象,采用对两条管道单独提供阴极保护的方法,研究阴保站附近管地电位过负的真正原因并提出相应的解决措施。此外,也对电位过负管段进行断电电位测量。结果表明:管道处于正常保护状态,日常测量中管地电位过负是受到阳极地床干扰所致。对于电位过负管段,所测试的管地电位只是一个表象,并不能代表真实的阴极保护电位,不能根据此数据判断防腐蚀层可能发生阴极剥离的可能性。
管地電位為衡量管道是否得到足夠陰極保護的重要評價指標,但在日常管理工作中,陰保站附近經常會齣現管地電位過負的問題,這為管道的安全運行帶來一定隱患。以秦皇島首站附近管道為研究對象,採用對兩條管道單獨提供陰極保護的方法,研究陰保站附近管地電位過負的真正原因併提齣相應的解決措施。此外,也對電位過負管段進行斷電電位測量。結果錶明:管道處于正常保護狀態,日常測量中管地電位過負是受到暘極地床榦擾所緻。對于電位過負管段,所測試的管地電位隻是一箇錶象,併不能代錶真實的陰極保護電位,不能根據此數據判斷防腐蝕層可能髮生陰極剝離的可能性。
관지전위위형량관도시부득도족구음겁보호적중요평개지표,단재일상관리공작중,음보참부근경상회출현관지전위과부적문제,저위관도적안전운행대래일정은환。이진황도수참부근관도위연구대상,채용대량조관도단독제공음겁보호적방법,연구음보참부근관지전위과부적진정원인병제출상응적해결조시。차외,야대전위과부관단진행단전전위측량。결과표명:관도처우정상보호상태,일상측량중관지전위과부시수도양겁지상간우소치。대우전위과부관단,소측시적관지전위지시일개표상,병불능대표진실적음겁보호전위,불능근거차수거판단방부식층가능발생음겁박리적가능성。
The potential of pipelines is an important parameter for evaluation of whether the pipelines have been effectively protected by cathodic protection nor not. In daily operation, the pipeline nearby cathodic protection station exhibits "over protection," which will impose potential hazard for the safe operation of pipeline. With a case study of pipelines nearby initial Qinghaangdao station, the root causes of "over protection" of pipelines nearby cathodic protection station are studied through separate cathodic protection of two pipelines, and corresponding solutions are presented. In addition, the electric potential of " over protection" pipelines is measured by "off" electricity. The results show that the pipelines are properly protected, the " over protection" in daily measurement is the result from interference of anode beds. For " over protection" pipline, the potential measured is just a phenomenon and does not represent the real cathodic protection potential, and therefore, can not be used to decide whether the anti - corrosion insulation has been spalled or not.