How short must the pipeline in front of the circulating water safety valve be to prevent freezing?
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Currently, the safety valve for circulating water is a manual valve combined with a pressure relief valve; it freezes in winter. If the section of pipe containing the pressure relief valve is removed and the safety valve is installed directly on the manual valve, I would like to know whether this is feasible. There is an elbow in front of the manual valve, and the total length of this elbow and the surrounding area is approximately 15 centimeters. I would like to ask how short this dead zone needs to be in order to prevent freezing, without the use of any heating. Thank you!
Whether a pipe will freeze depends on various factors, such as the fluid temperature, ambient temperature, pipe material, and the insulation of the pipe. There is no absolute length; generally, the shorter the pipeline, the less heat loss there is, and the less likely it is to freeze. However, even short pipelines can freeze if the ambient temperature is low enough or if the fluid remains stationary for an extended period of time. Removing the section of pipe that contains the pressure relief valve reduces the dead zone, which may help slow down the freezing process, but it does not guarantee that freezing will not occur. You can consider improving the insulation of the pipes, or adding heat tracing under extreme low-temperature conditions to prevent freezing. Installing a safety valve directly on a manual valve may pose risks due to the neglect of design safety considerations; it is recommended to consult relevant fluid system experts or safety engineers first to ensure that the modified design meets the requirements of preventing freezing in winter while also ensuring the safe operation of the system. .
Based on my many years of experience with heat tracing, pipes with leaks or bends that lack heat tracing will freeze no matter how short they are.
Don’t rely on luck – it’s better to get insurance to avoid trouble; just for your reference.
Agreed. Without elbows, it can still be discussed.