The conic mechanical seal has been used in sand pumps in oil fields with well performance, long life, low leakage and low power loss.
锥面机械密封已应用在离心砂泵上，经钻井公司使用，效果良好，泄漏量小，寿命长，功耗低。
As well leakage accidents caused serious harm and economic loss. Domestic and foreign experts and scholars have been working on how to prevent and deal with the problems of lost circulation.
由于井漏事故造成的危害严重、经济损失巨大，国内外专家学者也一直致力于如何预防和处理井漏问题的研究。
Pipeline leakage is a frequent phenomenon due to inevitable aging, erosion and contrived damage, which causes serious economic loss and environmental pollution as well.
然而由于不可避免的老化、腐蚀及人为损坏等原因，管道泄漏频频发生，所产生的经济损失和环境污染也十分严重。
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