Oxygen and PSA
Oxygen-enriched air
ISO 10083:2006, a standard withdrawn on 15 February 2016, used the term oxygen-enriched air for the gas produced by oxygen concentrator supply systems for medical gas pipelines, and applied only to systems producing it with an oxygen concentration of not less than 90%; ISO lists ISO 7396-1:2016 as its revision.
ISO 7396-1:2016 covers supply systems in which all sources deliver oxygen 93, with an oxygen concentration that may vary between 90% and 96%. HTM 02-01 (2026), the NHS England guidance, still uses the older term: Part B lists oxygen-enriched air among the medical gases of BS EN ISO 7396-1 pipeline systems, together with pipelines for oxygen-enriched air connected to oxygen concentrator supply systems complying with BS 7634 and ISO 10083.
In fire safety, WHO's Foundations of medical oxygen systems (2023) uses the same words for air with a raised oxygen level: it warns that even a small increase in the oxygen level in the air, from 21% to 24%, can be hazardous, and that oxygen-enriched air combined with a fuel source and a heat source can cause a fire. HTM 02-01 Part B notes that an oxygen-enriched atmosphere may be present when medical oxygen is used.
Sources
- ISO 10083:2006 (withdrawn), life cycle and abstract (iso.org)
- ISO 7396-1:2016, abstract (iso.org)
- HTM 02-01 (2026) Part B: Operational management, paragraphs 4.2 and 10.31 (NHS England)
- WHO, Foundations of medical oxygen systems (17 February 2023), section 3.6
Ultra Controlo figures come from its technical datasheets. Third-party facts were read at the source on the date shown.