Problems with installing temperature and pressure indicating instruments on distillation towers
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May I ask, when installing temperature and pressure indicating instruments on the tower again, why are valves installed on some of the outlet sections while none are installed on others?
There is no valve for temperature indication, as it is achieved through thermocouples that do not require direct contact with the medium. A pressure indicator requires a shut-off valve in order to allow for the replacement of the pressure gauge or to enable prompt isolation and handling in case of abnormalities.
Reply to 2# Chuan Nao Liao Kun: Thermocouples come in two types – those with sleeves and those without sleeves. Those with sleeves can be replaced online, while those without sleeves are in direct contact with the material and cannot be replaced online. Generally, cut-off valves cannot be installed on them, as temperature measurement must be carried out while the fluid is in flow; otherwise, temperature readings taken in areas where there are dead zones will be inaccurate