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The Elements: Cold weather can cause problems

机译:要素:寒冷的天气可能会导致问题

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摘要

Clear the Fog. The temperature of a sewer system remains about the same temperature throughout the year. When a manhole is opened in cold weather, the much colder outside air mixes with the warmer air in the manhole and sewer pipeline, creating fog. The fog will dissipate when the two temperatures equalize. However, this takes time. To speed up this process an air blower can be used to move the air through the manhole and pipeline. Typically, the blower is installed at the manhole where the inspection will begin while removing the manhole lid at the terminating manhole, causing the air to move through the pipeline. Another option would be to have a water jetter placed at the downstream manhole with the hose and nozzle just inside the pipeline set at normal jetting pressure. This action will create sufficient vacuum to move the fog out of the pipeline and clear the camera lens.
机译:清除雾。下水道系统的温度全年保持大致相同的温度。在寒冷的天气下打开人孔时,外界温度低得多的空气与人孔和下水道管道中的温暖空气混合,形成雾。当两个温度相等时,雾将消散。但是,这需要时间。为了加快该过程,可以使用鼓风机将空气移动通过人孔和管道。通常,鼓风机安装在将开始检查的检修孔处,同时在终止的检修孔处取下检修孔盖,从而使空气流过管道。另一种选择是将喷水器放置在下游的人孔处,而软管和喷嘴恰好位于管道内,并设置为正常的喷水压力。此操作将产生足够的真空以将雾气移出管道并清除相机镜头。

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    《Underground Construction》 |2013年第6期|69-69|共1页
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