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You find in this section elements relating to standards. ISO8573 air for general purpose NF12021 for breathing air, EN11100 for railway equipment, Pharmacopoeia.
You will also find examples of operational qualification as requested by the FDA audits or medicines, or MSNA.
Standard Compressed Air Breathing Air, Rail, regulations
ISO 8573-1:2010
General compressed air specification
BREATHING AIR NORM
Breathing air norm
NORM FOR RAILWAY ROLLING STOCK
Compressed air for railway rolling stock
PHARMACOPEIAS AND GMP
OTHER REGULATIONS