As a high vapour pressure petroleum cargo enters an empty tank there is a rapid evolution of gas, as a result it may be necessary to reduce the loading rates. During the loading of high vapour pressure cargoes a very high concentration of hydrocarbon gas, approaching 100% by volume, may be vented to atmosphere.

How do you handle high vapor pressure cargoes?

The use of very low initial flow rates into tanks. The use of very low topping off rates. Avoiding a partial vacuum in the loading line. Avoiding loading hot oil which has been lying in shore lines exposed to the sun.

Which effect can liquids with high vapour pressure?

Effect of temperature

The vapour pressure of the liquid increases with an increase in its temperature. The molecules of the liquid have higher energy at higher temperatures.