Thermometers installed at pipe elbows and the issue of diameter expansion
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The specifications provide clear guidelines regarding the installation method of thermometers: for pipes with a diameter of less than DN80, it is necessary to expand their diameter to DN100 or install them at pipe elbows (SH/T3104). Literally speaking, it is possible to install a thermometer at a elbow without the need for diameter expansion. But then the question arises: 1. DN80 is merely a general range; common sense tells us that the pipe diameter cannot be infinitely small. To what extent can it be reduced while still allowing installation at an elbow without the need for diameter expansion? 2. If we set a limit, such as allowing pipes with a diameter of DN50 or larger to be installed at elbows without the need for diameter expansion, then can pipes with a diameter smaller than DN50 have their elbows expanded to DN50 before the thermometer is installed there, thereby avoiding the use of excessively large diameter-expansion components? 3. For a thermometer installed at a elbow, an opening needs to be made at that location; is it necessary to reinforce the area where the opening is made? Are there any special requirements regarding the type of thermometer? For example, wear resistance, erosion resistance, thermometer installation method, welded sleeves, straight connectors
It says it’s not necessary to expand the diameter, but that doesn’t mean it’s absolutely impossible to do so; you can choose to expand the diameter. As long as the usage requirements are met, the diameter can be increased; it is not necessary to do so, and even for DN40, an increase in diameter is not required. :lol
If the diameter is not increased, it has to be installed at a elbow; DN40 will affect the flow in the pipeline, and if the diameter is even smaller, flow will be completely blocked
It should be no less than DN80, I guess. Specification requirements.