The difference between internal compression and external compression

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The main difference between the two is that the oxygen supply pressure for the product is achieved by pressurizing liquid oxygen in a cryogenic tank using a liquid oxygen pump; the liquid oxygen then undergoes heat exchange with high-pressure air in a high-pressure plate-fin heat exchanger, thereby vaporizing and being reheated. 　　(1) From a safety perspective, the internal compression process is theoretically more secure, as the air separation industry has extremely high requirements regarding safety. 　　(2) The cost of the liquid oxygen pump required for the internal compression process, along with the air booster, is correspondingly much lower ； Oxygen compressors have many safety factors to be considered in their design and manufacture, which makes them very expensive. 　　 (3) The internal compression process facilitates pipeline gas supply; foreign gas companies, while operating on-site gas supply services, usually also sell a large number of liquid products. Please, experts, fill in any gaps as well.