Relationship between pressure and LPG quality
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Dear sea friends: I have a question. Our company has a liquefied gas pipeline that is 7,100 meters long and has a DN200 diameter; it is currently being prepared for shipment. I have a question regarding how to calculate something related to this. The pipeline pressure was 0.4 Mpa before loading, and it rose to 0.6 Mpa after loading. The density of the liquefied gas during loading was 0.545. How much more liquefied gas can be contained in the pipeline at these different pressures before and after loading? Thank you.
Liquefied gas is in a liquid state during loading onto a ship, and it can basically not be compressed. As for the increase in pressure, it is due to the pressure present during the return process, which causes an increase in the pressure in the inlet pipeline. The density should not have changed, that is, it has not increased.
The pipeline transports liquid LPG, and its density remains essentially unchanged with pressure variations, so there is basically no increase. If it really needs to be calculated, one can look at the density at different pressures, take the difference to determine the weight