If the user holds liquid, it is calculated according to the specific gravity of the product, but there must be enough space for the product to expand and crack by 10% due to thermal expansion (but a low boiling point product is another matter) to prevent the steel drum from expanding and cracking when it is deformed. If users hold products with low boiling points (generally referring to boiling points below 60°C), they must fully consider that such products have vapor pressure at a certain temperature, and liquid vapor pressure increases with temperature. In addition, it is necessary to consider the temperature difference between the highest storage and transportation temperature (up to 60 degrees, such as the equator) that the steel drum may encounter after the product is filled, which will cause the volume of the product to expand and cause internal pressure in the steel drum. The sum of these two pressures cannot be greater than the allowable internal pressure of the steel drum, otherwise the steel drum will burst.
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