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                    法蘭的維修

                    2020-05-21 11:14:23 cjgdadmin 1623

                    管道長期使用后,墊片會發生泄漏。當更換墊片時,法蘭又難以張開,可采用自制簡易工具,把兩片法蘭撐開。

                    1、法蘭連接不嚴密的原因

                    相連接的兩個法蘭密封面不平行;

                    法蘭密封面上有缺陷;

                    管道投入運行后,未進行法蘭螺栓的二次緊固;

                    墊片失效:①材料選擇不當;②墊片過厚,被高壓介質刺穿;③墊片有皺紋、裂紋或折斷;④墊片經長期使用失效;

                    管道投入運行后,未進行法蘭螺栓的二次緊固。

                    2、消除方法

                    熱彎法蘭一側的管子:在需要進行彎曲的一側上,用氧乙炔焰將長度等于3倍直徑、寬度不大于半徑的帶形面加熱,然后彎曲管子,使兩國法蘭密封面平行;

                    深度不超過1mm的凹坑、徑向刮傷等,在車床上加工;深度超過1mm的缺陷,在清理缺陷表面后用電焊焊補,再用手銼清理、刮平或磨平;

                    在管道投入運行后,當溫度和壓力升高到一定值時,適當再擰緊螺栓,在運行后的幾天經常檢查螺栓盡快情況;

                    更換新墊片,墊片材料應按介質種類和壓力選用;該墊厚度符合規定的墊片;改裝質量合格的墊片;定期更換新墊片;

                    在管道投入運行后,當溫度和壓力升高到一定值時,適當再擰緊螺栓,在剛運行的幾天經常檢查螺栓緊固情況。


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