| 摘要 |
An arrangement for removing occluded air in a refrigerated liquid circulated through a plurality of freezing elements used in solidifying incompetent earth formations, which includes bleed lines extending from the freezing elements to manifolds positioned above the freezing elements, a valve in each bleed line controlling the flow to allow air and a minor amount of said liquid to be conducted therethrough, the manifold sloping downwardly to the inlet of a pump that returns the liquid from the manifold to the refrigeration plant, and float-operated vent devices connected to and positioned above the manifolds for collecting and discharging the air.
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