Oxygen-Enriched Atmosphere (OEA) 3 : An atmosphere in which the concentration of oxygen exceeds 21 percent by volume or the partial pressure of oxygen exceeds 160 torr (millimeter of mercury), or both
NFPA 59A Standard for the Production, Storage, and Handling of Liquefied Natural Gas (LNG), 2009 ed. http://www.giignl.org/sites/default/files/PUBLIC_A REA/About_LNG/4_LNG_Basics/lng_4_-_operational_int egrity_7_3_09-aacomments-aug09.pdf, (Std: Prod, Storage, and Hndlg of LNG - Amer) {215 NFC}
NFPA 53 Recommended Practice on Materials, Equipment, and Systems Used in Oxygen-Enriched Atmospheres, 2004 ed. https://www.nfpa.org/assets/files/AboutTheCodes/53 /53-F2009-ROP.pdf, (Recmm Prac: on Mtrl, Equip and Sys Used in Oxy-Enriched Atm - Amer) {209 NFC}