Possible reason/justification in future pandemic planning!
During Covid in my (mid size district general) hospital Respiratory wards extensive use of oxygen(Bilevel ventilation) caused pressure fluctuations (visible on O2 Thorpe tubes) connected to oxygen pipe line!
So acute respiratory rooms had 'wider' bore second supply pipeline to reduce strain on rest of ward O2 pipeline. There were tests carried out with calibrated 'pressure' leaks to discover maximum theoretical flows but estates dealt with this.
