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Petty Officer 2nd Class Thomas Armstrong, Station Cryogenics Division technician, purges a cryogenic hose over a liquid oxygen pan at the Navy Cryogenics Division building here July 9. The process of purging clears the hose of excess oxygen or nitrogen particles. - Petty Officer 2nd Class Thomas Armstrong, Station Cryogenics Division technician, purges a cryogenic hose over a liquid oxygen pan at the Navy Cryogenics Division building here July 9. The process of purging clears the hose of excess oxygen or nitrogen particles.