Oxygen Machine is one kind of product producing oxygen from air. There are small oxygen machine providing 3-10 liter per minute flow, mainly using at home. There are also big Industrial Oxygen Generator providing oxygen with flow rate up to 10000 Nm3/hr. From technology, there are pressure swing adsorption(PSA) , vacuum swing adsorptio (VSA)and cryogenic three types. The PSA type is for smaller flow rate within 300 Nm3/hr, from 300 to 3000 Nm3/hr, it is ok to use VSA technology. For bigger flow rate, normally use cryogenic Oxygen Plant.
No matter what technology, these oxygen machines all use oxygen in the air. All use Air Compressor to provide raw material, compressed air. Then the compressed air will be cleaned, dried for futher separation. After separation, the produced oxygen either directly goes to oxygen using point or they are compressed into high pressure such as 150 bars or 200 bars, then stored in cylinders and tanks.
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Houston News: New York-listed global rotary equipment and parts service provider Dresser-Rand Group Inc has received more than $700 million worth of compression equipment and service contracts from TUPI BV and GUARA BV, both joint ventures owned by Petrobras Installed to 8 FPSO vessels, the equipment includes 80 sets of DATUM compressor units, as well as training, after-sales service and 10 years of maintenance.