Antifreeze and NFPA 25

Here's my question referring to my earlier post.  What would one consider an impairment?  We don't know what solution was initially installed in the CPVC antifreeze systems only that they are now 25 deg F to -10 deg F.  ___ Sprinklerforum mailing list S

Antifreeze Solution and NFPA 25

We have several CPVC antifreeze systems that we've checked with a hydrometer to see the condition of the solution.  The ranges are from a +25 to a -10 deg. F.   NFPA 13 (2010) states in Figure A.10.5.1 that the lowest one-day mean temperature is 0 degrees for our location in sunny Texas. The manu

HELP - Permanent Heat Source in Sprinkler Riser Rooms

Thanks in advance I could use your help. Will anyone help me to identify what a "permanent heat source" might and might not be when it comes to fire sprinkler valve rooms? What can I say - I'm from Texas! Danette at Arro