I have a question regarding the unloading of liquefied gas
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I am currently working on a liquefied gas tank farm, and initially plan to use pumps for unloading, with a flow rate of 20 cubic meters per hour. I’m not sure if there’s a problem. Do truck tankers come equipped with a unloading pump? I seem to have heard that some cars come with it? Also, after unloading, tank trucks generally cannot return under pressure; they are equipped with vapor equilibrium pipes, which means the pressure inside the truck is the same as the pressure in the tank. So, how is this problem usually solved? Can the gas phase tube be purged with nitrogen? Is it a problem if some nitrogen mixes with liquefied gas in the spherical tank? How are tank trucks usually emptied after unloading? What methods are used for this?
It’s best to use a unloading compressor, as it unloads quickly and thoroughly! Hehe
The tank truck is not equipped with a pump; one is provided at the tank farm. The gas phase is drawn into the spherical tank using a compressor. Do not use nitrogen.
A LPG compressor is used to extract gas from the storage tank, transport it to a tank truck, and unload it under pressure. After unloading is complete, a compressor can be used to extract the gas from the tank truck, thereby reducing its pressure.
You can try to open the vapor equilibrium line and use the pressure difference to force the liquefied gas into the tank truck.
Generally, compressors are used for unloading, but centrifugal pumps can also be employed; in the case of gas, it’s sufficient to use a balance line to equalize the pressure between the tank truck and the storage tank
I would like to ask what to do with the liquid ammonia in the pipes after unloading the cargo
I’ve seen tank trucks equipped with dump pumps, but those vehicles were imported from Japan
Unloading 20 cubic meters per hour is quite slow. It’s possible to empty the tank using just a pump, but it depends on where the pump is installed and what type of pump is used. Using nitrogen does not affect the quality of the product; however, I’m not sure what purpose nitrogen serves in this process. If you don’t use a compressor and don’t introduce gas phase during unloading with a pump, then there’s no need to release pressure from the tank after unloading. After the tank is emptied, the liquid and gas phases can be released directly, and generally no recovery device is required.
Is there a carburetor for releasing liquefied gas? How is it working? Let the experts give some advice.
I’m seeking safer and more environmentally friendly methods of unloading goods other than using compressors