I figured an open container of fluid would be the same throughout the
container, or a homogeneous solution. But I did not expect that a closed
container would be a homogeneous solution. So why do we need a test drain
at the far end of the pipe, and why do we need another test port at
mid-center, if the system is 150 gallons or more? And at what point does
stratification become important? Two stories, four or ten stories. Is
there a point where we should add a circulating pump to insure the
antifreeze level is the same through the piping?
I have ordered more glycol antifreeze. We will drain all the antifreeze
into clean three 55 gallon barrels. That will allow us to know the pipe
capacity. After draining the system, we will connect the vacuum to the
piping to make sure we have all the fluid out of the piping. Then we can
add enough antifreeze to protect the building. What is left, we will pump
into the sewer system. They have their own on-site sewage treatment, 2
open ponds.
Thanks to those who responed.
-----Original Message-----
From: AKS-Gmail-IMAP
Sent: Wednesday, October 21, 2015 9:33 PM
To: sprinklerforum@lists.firesprinkler.org
Subject: Re: Antifreeze system
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 <fire...@eoni.com> 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
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