Customers who require large, or "tonnage" volumes of oxygen and/or nitrogen in a continuous fashion can obtain them from an Air Products dedicated plant or pipeline. The products will commonly be produced in a cryogenic air separation plant which operates by compressing air and cooling to cryogenic temperatures under which conditions the air liquefies and can be separated by distillation.

Plants supplying up to 4000 t/d gaseous oxygen are available to meet the needs of the metals, glass, refining and petrochemical industries. These plants co-produce nitrogen and frequently are constructed to produce liquid oxygen and nitrogen as local back-up or for merchant export. A similar flexibility in size is available in nitrogen-only plants which find application in metals, electronics, refining, chemicals, enhanced oil recovery and natural gas dilution.