Pipe Ice Plugging Tests Using A ~ 15% Exhaust Liquid Nitrogen Vapor Restriction For The Freezing Device Mounted On A 200 mm Horizontal Pipe, In A Stationary Flow Regime

The ice plug isolation technique used for large diameter horizontal pipes is applied for repair and maintenance activities on hydraulic installations that use liquid working agents. These techniques do not require shutting down the entire plant. Information required for dimensioning such devices and regarding their operation techniques is extremely brief. The nitrogen vapours exhaust nozzle diameter is randomly chosen. Reducing it by 15% has an influence over the ice development process inside the testing pipe. Its influence is more or less dependent on the nitrogen injection technique inside the freezing device. The article contains a brief presentation of the experimental technological facilities used, followed by a series of two experiments performed on a 200 mm testing section using demineralized water in stationary mode under similar temperature and liquid nitrogen supply conditions. At the end of the paper there is a brief result analysis and a few conclusions. The paper is dedicated to specialists working in research and technological engineering. (author).