Oil volume and density usage

Of course, it is impossible to collect the tank volume according to the density provided by the other party's ship. Because the original cargo volume in the tank is much different from the purchased volume, or the density of the original tank is very different from the density of the incoming ship, the actual density of the tank after the final tank purchase is bound to be quite different from the density provided by the ship. The general approach is to calculate a theoretical mixing density based on the purchase quantity standard, purchase density, final receipt quantity standard and the original tank standard number and density (mixed density = incoming ship density) * Purchase bid/total bid + tank density * The standard square meter of the tank before purchase/total square meter) is then compared with the actual measured density of the tank through multi-point sampling, and finally a yield density is obtained.

Does the brother upstairs have any basis for using mixed density? Evidence is the best tool for persuasion, thank you.

The mixed density is for reference. The basis is based on the actual measured density before and after the tank is purchased. However, sometimes the density cannot be obtained due to sampling problems in the actual measurement, so the theoretical mixed density will be used as a good reference. The standard should be measured by commercial inspection agreed by both parties.

It should be the calculation of the actual density after entering the tank. By measuring the temperature of the liquid after entering the tank (if there is a temperature difference, you can take a few more points to take the average), and convert it into the density at the current actual temperature based on the standard density of the oil at 20 degrees Celsius. There should be a conversion formula for this.

It must be calculated based on the density we measured ourselves. When oil products are put into the warehouse, except for bonded goods, they are pre-inspected for domestic trade before being put into the warehouse. The quantity received must be based on the density we make ourselves.

Agree with the approach on the second floor. Our unit uses the measured density of samples taken from the tank to calculate the final actual purchase volume. After the ship docks, our personnel will measure the actual density in accordance with regulations and compare it with the density provided by the ship (we require the ship to measure and measure the density after loading and before leaving the port) or the refinery. If there is a large difference, we will contact the relevant units to analyze the reasons. After entering the tank, if the density of the incoming oil is significantly different from the density of the original oil in the tank, there may be oil stratification. Multi-point sampling is used to measure the density, and the average mixed density is calculated based on a rough ratio. Sometimes the mixed density is calculated according to the formula on the second floor, and then combined with the measured density, the final calculated density is given and the weight is calculated. In addition, we usually stipulate that if the mixing density of the oil in the tank differs by more than 0.15% from the calculated value provided by the formula provided on the second floor, we must take samples from multiple points in the tank and then measure the density again, and require another person to measure, that is, two people to measure, to prevent errors.