Insulation issues for circulating cooling water
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In the city where I live, the lowest temperature in winter drops to minus 10 degrees Celsius. The main pipes for the circulating cooling water are 2 inches in diameter, while the branch pipes are 4/8 inch in diameter. Since these tests are not conducted frequently, it would be a waste to use insulation throughout the system. Is there any good way to prevent the cooling water from freezing without using insulation?
With circulating water, as long as it stays flowing, it shouldn’t freeze, right? If you’re going to stop for a long time, just leave it empty; it seems like the water volume isn’t very high either...
Just keep it flowing; the common practice is to leave a certain opening for some low-point drain valves. When it’s very cold in winter, if it’s not in use, drain the circulating water and fill it with nitrogen as a protective measure to prevent rusting
The views supporting the 2nd and 3rd floors are valid; for simple experimental setups, this approach is indeed more reliable. If it’s an indoor setup, heating should be considered
For DN100 and above, insulation is not necessary; for DN100 and below, it is better to use insulation
Maintain flow or empty to prevent corrosion with nitrogen filling.
Ensure liquidity. Don’t stop; if you have to stop for a long time, then vent the pipe.