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Building is a freezer.

It's the 2010 NFPA 13 that we're subject to. Just speaking with the Fire Sprinkler designer, and the issue is the antifreeze concentration (above 38%). Originally a dry system was planned, based on original water main pressure numbers, but the City did some newer testing, and the numbers were...

Thanks guys, cdafd, yes, this is located within the US. Skdesigner, I found a copy of this Tentative Interim Amendment, effective 3-21-11 dealing with Premixed Antifreeze Solution. Am I correct in assuming that this is essentially code for now? This may be the issue, actually, as this...

Thanks for the response, cdafd. Yes, it is high-pile storage, up to 20-ft. It's approx. 13,900 (200x69.5) SF in the freezer, and the designer has specified Tyco ELO.231B Pendents, K-11.2. Standard Response. It's a gridded system with 2" branch lines and 6" cross mains.

We have a freezer building with a design operating temperature of 0-degrees F. Because of this, we have a system with 50% Propylene Glycol, which should allow for anti-freeze safety in the building down to a temperature of -26. However, the Propylene Glycol increases the water density...