In the spirit of ensuring a change is made to table 5.1.11 in every edition, I wanted to offer this proposal up for discussion.

I would like to see the standard operating pressure for nitrous oxide be changed to 45-55 psig.  The substantiation comes from Annex D of ASSE 6000, specifically D.3.1 subparagraph e) 1) which states that it is recommended that nitrous oxide be set and maintained at least 5 psig below the normal operating pressure of oxygen and med air.  

Also, carbon dioxide is often needed to run at higher pressures than 50-55 psig.  Depending on what type of insufflators a facility is using, the may require a CO2 pressure of 70, 80 or even 90 psig.  So the standard operating pressure for CO2 I think should have a greater range of 50-90 psig.