On Nov 14, 8:40 pm, Dave S wrote:
There is essentially NO moisture in the tank of medical oxygen - for the
same reasons there is no moisture in aviation or welders oxygen. Any
moisture or humidification in a medical stream is added at the point of
use, AFTER the flowmeter.
Dave,
This source confirms your statement

http://www.c-f-c.com/specgas_products/oxygen.htm