The core standard for the safe volume of an LPG storage tank is a filling coefficient not exceeding 0.9, while also accounting for volumetric expansion caused by temperature fluctuations.
Safe Volume Calculation Standard
The maximum safe filling quantity for an LPG storage tank is determined by a filling coefficient of 0.9. Specifically, for a tank with a nominal volume of V, the permissible safe filling volume is V × 0.9.
Example: For a 50-cubic-meter tank, the safe filling volume is 45 cubic meters.
Temperature Effects and Volumetric Expansion
This regulation is designed to prevent tank overpressurization caused by the thermal expansion of the liquid. The volumetric expansion coefficient of LPG is approximately 0.0038/°C. This means that for every 1°C rise in temperature, the liquid volume increases by about 0.38%. During design and operation, it must be ensured that even at the maximum expected temperature (typically calculated based on 50°C), the expanded liquid volume does not fill the entire tank, thereby maintaining a 10% vapor space as a buffer.
Key Safety Parameters
Filling Coefficient: Must not exceed 0.9; this is the most critical mandatory safety metric.
Design Temperature: The safe filling quantity is typically calculated based on an ambient temperature of 50°C.
Liquid Phase Volume: In actual operation, LPG is filled in liquid form, and its maximum volume must be strictly controlled according to the safe volume limit.
