Just a word of caution !

Yes the cause and effect:

In regards to the reduction of the IA system receiver pressure 

(original listed as 200 psig) and the final line pressure (still in table 5.1.11 listed as 169-185 psig) for a Instrument Air ( IA ) Medical Support Gas.

The NFPA 99 Edition 2018, provides a statement that allow, a reduction in the source and final line delivery pressures. In my opinion the wording is weak .

Section 5.1.13.3.4.3 & 5.1.13.3.4.5.

This change still refers us back to Table #5.1.11

which has IA pressures between 160-185 psig.

But no matter what you do / the system still has to provide the following requirements . 

1) Quality of IA Source (i.e. up-stream of the final line regulator) 

a pressure Dew-Point of -40 C ( -40 F)

2) Master and Local Alarms, if the IA system delivery pressure exceeds a pressure Dew-Point of -30 C ( -22 F )

The above is just a short listed of all the items or conditions still required.

(see the full section #5.1.13.3.4)

Also for those with existing IA systems with the intent of just turning down the final line pressure to less than the listed (160-185 psig), remember to replace the pressures relief valves to meeting the code.   

Steve Bradshaw wrote:

I think Corky is right

Using ~60 psig "Non-Medical Air" instead of Instrument Air does not require costly zone valves, area alarms, master alarms, special instrument air labels, and a very expensive source supply.  In my opinion Instrument Air is "permitted," but not "required" to be used for boom brakes, and a much less expensive Non-Medical Air system is also permitted to be used for boom brakes.

I agree with you Steve and Corky but it seems like most boom brakes operate @ 80psig. Maybe that's just Steris and Stryker.