The hazards of using nitrogen to pressurize the liquefied gas tanker into the tanker after it has been loaded
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Recently, a problem was discovered. The liquefied gas tank truck supplied by the company was filled with liquefied gas before leaving the factory, and then nitrogen was pressed into the tank truck to increase the gas phase pressure. After testing, the gas phase nitrogen content of the tank truck was as high as 40%wt. This material After entering the device, the depropanizer tower is overpressured, >1.8mpa. In order to ensure that the depropanizer tower is not overpressured, it needs to be continuously discharged. The nitrogen content in the reflux tank is about 30%wt. In order to achieve the separation effect, the steam consumption of the tower reboiler rises sharply. Please discuss whether this is illegal after the liquefied gas tanker is filled with liquefied gas, and then nitrogen is used to pressurize the tanker to increase the gas phase pressure. Is there any regulation that prohibits this? ； Also, how much benefit does this bring to the other company or driver?
The raw material car samples containing liquefied gas are sometimes used for replacement, and some are deliberately added for profit.