Dear Sirs,
This is my first post in this forum. I highly appreciate if you can help to clarify my questions regarding the kerosene storage tank as follow:
In my refinery, there is a tank to store kerosene rundown from CDU/KTU with flash point min + 38oC. The kerosene is then used to blend diesel.
The kerosene tank has an internal floating roof, but no circulation vents or inerting system. The maximum operating temperature is approximately 38oC (see attached file). But the tank temperature can be lowered maximum 35oC by reducing kerosene rundown temperature.
So
1. Is that safe to store the kerosene with lower flash point but still higher than the tank operating temperature in that tank? And what is safe margin of kerosene flash point above tank operating temperature that should be maintained because I suspect that the temperature of space between floating and fix roof would be higher than the tank operating temperature?
2. If the kerosene flash point is reduced lower than the tank operating temperature, does the tank need any modifications such creating circulation vents or inerting? Could you help to calculate the circulation vents or Nitrogen requirement for blanketing in those case.
Thanks,