天然氣球閥内漏的原因及處理方法-資訊--格業閥門有限公司_鸭脖电竞

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鸭脖电竞

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天然氣球閥内漏的原因及處理方法

發布時間:2017-11-17 22:27:08   訪問:777

球閥内漏的原因

  1)施工期造成閥門内漏的原因:

       ①運輸和吊裝不當引起閥門的整體損傷從而造成閥門内漏;

       ②出廠時,打完水壓沒有對閥門進行幹燥處理和防腐處理,造成密封面鏽蝕形成内漏;

       ③施工現場保護不到位,閥門兩端沒有加裝盲闆,雨水、砂子等雜質進入閥座,造成洩漏;

       ④安裝時,沒有對閥座注入潤滑脂,造成雜質進入閥座後部,或焊接時燒傷引起内漏;

       ⑤閥沒有在全開位進行安裝,造成球體損傷,在焊接時,如果閥不在全開位,焊接飛濺物将造成球體損傷,當附有焊接飛濺物的球體在開關時進一步将造成閥座損傷,從而導緻内漏;

       ⑥焊渣等施工遺留物造成密封面劃傷;

       ⑦出廠或安裝時限位不準确造成洩漏,如果閥杆驅動套或其他附件與之裝配角度錯位,閥門将洩漏。

  2)運行期造成閥門内漏的原因:

  ①最常見的原因是運營管理者考慮到較為昂貴的維護費用對閥門不進行維護,或缺乏科學的閥門管理和維護辦法對閥門不進行預防性維護,造成設備提前出現故障;

       ②操作不當或沒有按照維護程序進行維護造成内漏;③在正常操作時,施工遺留物劃傷密封面,造成内漏;

       ④清管不當造成密封面損傷造成内漏;

       ⑤長期不保養或不活動閥門,造成閥座和球體抱死,在開關閥門時造成密封損傷形成内漏;

       ⑥閥門開關不到位造成内漏,任何球閥無論開、關位,一般傾斜2°~3°就可能引起洩漏;

       ⑦許多大口徑球閥大都有閥杆止動塊,如果使用時間長,由于鏽蝕等原因在閥杆和閥杆止動塊間将會堆積鐵鏽、灰塵、油漆等雜物,這些雜物将造成閥門無法旋轉到位而引起洩漏——如果閥門是埋地的,加長閥杆會産生并落下更多的鏽蝕和雜質妨礙閥球旋轉到位,引起閥門洩漏;

       ⑧一般的執行機構也有限位,如果長期造成鏽蝕,潤滑脂硬化或限位螺栓松動将使限位不準确,造成内漏;

       ⑨電動執行機構的閥位設定靠前,沒有關到位造成内漏;⑩缺乏周期性的維護和保養,造成密封脂變幹、變硬,變幹的密封脂堆積在彈性閥座後,阻礙閥座運動,造成密封失效。

天然氣球閥内漏的判斷方法

  天然氣管線上常用的是固定軸球閥,其一般的檢查方法是:将閥門轉動到全開或全關位,通過閥體排污嘴的排放檢查是否有洩漏。如果可以排幹淨,則證明密封良好。如果始終有壓力排出,則可以認為閥門洩漏了,這時要對閥門進行相應的處理。

天然氣球閥内漏的處理程序

  ①首先檢查閥門的限位,看是否通過調整限位能解決閥門的内漏。

       ②先注入一定量的潤滑脂看是否能止漏,這時注入速度一定要慢,同時觀察注脂槍出口壓力表指針的變化來确定閥門的内漏情況。

       ③如果不能止漏,有可能是早期注入的密封脂變硬或密封面損壞造成内漏。建議這時注入閥門清洗液,對閥門的密封面以及閥座進行清洗。一般最少浸泡半小時,如果有必要可以浸泡幾小時甚至幾天,待固化物全部溶解後再做下一步處理。在這一過程中最好能開關活動閥門幾次。

       ④重新注入潤滑脂,間斷的開、關閥門,将雜質排出閥座後腔和密封面。

       ⑤在全關位進行檢查,如果仍有洩漏,應注入加強級密封脂,同時打開閥腔進行放空,這樣可以産生大的壓差,有助于密封,一般情況下,通過注入加強級密封脂内漏可以消除。

       ⑥如果仍然有内漏,就要對閥門進行維修或更換。


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