Freeze pipe12/14/2022 ![]() For frozen areas with a small volume and short maintenance phase, it can be an economical alternative even though nitrogen is a consumable. The advantages of ground freezing with liquid nitrogen over brine are the short mobilisation time for the equipment and a substantially shorter freezing time (usually 3 The collected data is recorded and stored on an online platform and can be accessed at all times. The freezing process, the frozen area and frost expansion is monitored with measuring pipes equipped with sensors. Temperaturecontrolled magnetic valves discharge the liquid nitrogen into each freeze pipe. Heat is extracted from the soil and frozen areas are formed during evaporation. The escaping gas is then collected in exhaust pipes and discharged into the atmosphere through an exhaust tower. As the nitrogen exits the downpipe it evaporates and flows back through the freezing pipe. ![]() The liquid nitrogen flows through insulated pipes to the freeze pipes and via a down-pipe to the deepest points of the pipes. The liquid nitrogen is delivered by specialized trucks to the construction site where it is temporarily stored in vacuum-insulated tanks. An economical alternative is to use liquid nitrogen during the freezing phase and to switch to brine freezing for the maintenance phase.Īrtificial ground freezing with liquid nitrogen uses cryogenic liquefied nitrogen with a temperature of -196☌ as a refrigerant. Max Bögl owns all the necessary equipment for brine freezing, including cooling towers, storage tanks for brine, pumps and insulated pipes of various dimensions.Ĭompared to freezing with liquid nitrogen, brine freezing is more cost-effective for frozen areas with large volumes and/or a long maintenance phase. The layout of the freeze pipes defines the geome-try of the frozen area.ĭepending on various factors affecting the freezing phase, this process can take up to 20 to 40 days to complete. Expansion as well as the temperatures within the frozen area are measured using temperature measuring pipes which are fitted with sensors. These columns connect and form frozen walls or plates. With progress of time, cylindrical frost columns grow around the freeze pipes. The cold brine flows through the freeze pipes withdrawing heat from the soil around the pipe. ![]() The brine is cooled to temperatures of -30 to -40☌ by freezing units and then pumped through an insulated circuit to the freeze pipes and back. ![]() For artificial ground freezing with brine, a saline solution, usually calcium chloride is used as the refrigerant. ![]()
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