How are the temperature and pressure of the steam used for insulating storage tanks determined?
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As stated in the title, a new 200 m3 anhydride storage tank has been installed at the factory. The freezing point of anhydride is 52 degrees, while the designed temperature for the storage tank is 60 degrees; steam heating is used for this purpose. I have never done insulation work on tank areas, and I would like to ask how to determine the temperature and pressure of steam? I also want to ask if it’s possible to blend oils in storage tanks? Consider running a line from the outlet of the raw material pump in the tank area back to the raw material tank, and installing a mixing nozzle inside the tank. I wonder if this will enable uniform mixing?
Saturated steam at 0.3 MPa is sufficient, at 144°C.
Thank you for the reply. I was wondering if this is based on experience? I also would like to ask how to obtain the desired temperature and pressure of steam from the boiler?
Based on experience, the low-pressure steam in ordinary factories is around 0.3 to 0.4 MPa. For boilers, simply tell the boiler manufacturer the steam pressure and temperature you need, and they will recommend a suitable model for you.
Thank you! :victory:
Does steam tracing mean using coiled tubes to cover the surface of the storage tank? You yourself said that the designed operating temperature for the equipment is 60 degrees, so this approach is not recommended; if additional heating is needed, a circulation system utilizing a heat exchanger for heating would be required to enable continuous operation. As for mixing, it should be at the pump outlet… actually, the inlet is more suitable; it would be best to install a mixer as well at the outlet. PS. The design temperature for this storage tank is a bit strange… the freezing point of its contents is 52 degrees, but it can only withstand temperatures between 52 and 60 degrees when heated… which doesn’t seem very logical
Firstly, the design temperature for the storage tank is 60 degrees. What’s the point of having a higher temperature? A too high temperature results in waste of steam. In this project, one pump is used for both loading and unloading; mixing takes place only during unloading (as the quality of the first batch of material may differ from that of the second batch). Mixing can only be done at the pump outlet. If separate pumps are not used, it would indeed be better to install a mixer at the pump inlet. However, since the batches of material differ, mixing is carried out inside the tank. Or do you have any better suggestions? Thank you for your reply
Since the freezing point is 50, the designed operating temperature for the equipment is 60; in other words, the operating temperature lies between 50 and 60. A capacity of 200 M3 isn’t very large. From another perspective, it’s quite easy for the temperature to either exceed or fall below this range, leading to freezing or conditions beyond what the equipment can handle. If I were to operate this equipment, I would consider whether waste heat could be utilized with a heat exchanger to provide additional heating, as this would help achieve a more uniform temperature distribution. As for mixing, since there are considerations related to material input and output, it’s difficult to give specific advice on this matter. Please understand
Oh, I see. There might be an issue with my writing; the operating temperature is 60 degrees. My apologies. Using a heat exchanger to stir the raw material storage tank doesn’t seem quite appropriate; I hadn’t dealt with this aspect before and didn’t understand it either. Anyway, thank you for your reply :)