The article introduces the technology of liquefied nitrogen freezing for the construction of the drain repairing of communication passage.
本文主要介绍了旁通道排水管修复液氮冻结加固施工技术,为今后类似排水管修复工程提供经验。
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When the water level of condensate in the drain sump drops, the cup to shut the admission pipe falls down, the passage for steam to enter into the valve body is opened.