Issues related to LNG low-pressure transfer pumps, loading time, and tank containers
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Hello, experts. I have a few questions and hope you can help answer them: (1) How are the flow rate and number of low-pressure LNG transfer pumps determined? What can be found online is usually just a brief description; for example, it is mentioned that the processing capacity is 3 million tons per year and that 3 LNG storage tanks have been installed, with each tank equipped with 2 low-pressure transfer pumps with a capacity of 480 m3/h. However, there is no detailed explanation as to why this arrangement is used. I would like to know how these figures are calculated. (2) How long does it generally take to load LNG onto ships? Used to determine the flow rate of the LNG loading pump. (3) How many LNG tank containers can generally be loaded at once, and are there any relevant documents available?
There is another question: how is the flow rate for cooling in the LNG cycle determined?
This post was last edited by tomlinson on 2020-2-7 at 13:24. 1. For LNG low-pressure transfer pumps, two main factors need to be considered: first, the requirements for high-pressure transmission, and second, the amount of gas to be loaded. If transmission and loading need to take place simultaneously, then these two amounts are added together； 2. For LNG loading pumps, it is generally considered that the larger they are, the better, mainly because berthing LNG carriers incurs fees, and the shorter the time, the lower the cost. Of course, the larger the LNG loading pump, the higher the price. 3. This isn’t very clear.
Thank you so much, expert. I have another question: for the flow rate of the low-pressure pump, should we also take into account the heat preservation requirement during circulation when the cargo is not being unloaded? How can this value be determined?
Thank you so much, expert. I have another question: for the flow rate of the low-pressure pump, should we also take into account the heat preservation requirement during circulation when the cargo is not being unloaded? How can this value be determined?
This post was last edited by henglinkou on 2020-4-9 at 20:53. It’s a spreadsheet I created myself for trial use.
I would like to ask if there is a data sheet or technical specification for the loading pump? What is the typical export pressure? Can it directly access the low-pressure pipeline network?