According to Dow Chemical propylene glycol is completely soluble in all proportions in water. It “dissolved" into the water. A liquid dissolving into another is a notion we rarely think about. You ended up with about 90 gallons good for 15F. That is 25% glycol or 22.5 gallons glycol in a 90 gallon mixture. You had planned for 60 gallons mixed. That would be 22.5 gallons glycol in 60 gallons total. That is about 37% glycol. So you must have been shooting for about 0 F. In other words the premix was for about 0F in order for the numbers to make sense.
Allan Seidel St. Louis, MO > On Oct 20, 2015, at 9:59 PM, Douglas Hicks <[email protected]> wrote: > > We installed an isolation valve on an propylene glycol antifreeze loop. > Unfortunately, we were told the system was about 55 gallons. It was closer to > 90 gallons. We only had enough antifreeze for 60 gallons. We used what > antifreeze we had, and finished the job with straight water. My thought was > to drain the water, monitoring the liquid until we got to the antifreeze. > Then we would fill the system with an antifreeze mix. > > Today, we returned to the job site with 30 gallons of antifreeze. We > closed the isolation valve and drained out 5 gallons. The drained water > tested to 15°F. We tested the fluid at the other end of the piping. It > also tested 15°F. I thought the antifreeze loop was a closed system. How did > the antifreeze and water get mixed in a closed pipe system? > > Douglas Hicks > General Fire Equipment Co of Eastern Oregon, Inc > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
