The glycol system in my brewpub is at least 10 years old. I believe the piping is 18 years old (the age of the company). In general, it's been pretty well maintained. There is one reservoir and three loops; 1 chiller coil and two tank. Each loop is individually pumped.
Recently, we noticed a rise in the glycol reservoir temperature and slightly longer crash times. Thinking it might be worn out glycol (18 months old) we scheduled a drain and change. During that glycol change (a week ago) I noticed a pretty slow return flow from the cooling coil. It seemed like a physical blockage, so we hooked up a hose and backflushed it. We noticed some white, sand-like particles coming out. They looked like CaCO3 chunks and dissolved in phosphoric acid. It took an acid flush of the coil to clear the deposits.
So, I'm assuming random distribution could mean a similar buildup in the tank lines and jackets. At least one tank may be showing symptoms, since it's very slow to crash (over 48 hours with 30F glycol). I don't really want to do an acid rinse on that whole system because of cost, old plastic and unknown parts and plain 'ol ignorance of what might happen.
Has anybody else had to do this? One idea I had was to recirculate with RO or distilled water, thinking the minerals might dissolve into that.
Recently, we noticed a rise in the glycol reservoir temperature and slightly longer crash times. Thinking it might be worn out glycol (18 months old) we scheduled a drain and change. During that glycol change (a week ago) I noticed a pretty slow return flow from the cooling coil. It seemed like a physical blockage, so we hooked up a hose and backflushed it. We noticed some white, sand-like particles coming out. They looked like CaCO3 chunks and dissolved in phosphoric acid. It took an acid flush of the coil to clear the deposits.
So, I'm assuming random distribution could mean a similar buildup in the tank lines and jackets. At least one tank may be showing symptoms, since it's very slow to crash (over 48 hours with 30F glycol). I don't really want to do an acid rinse on that whole system because of cost, old plastic and unknown parts and plain 'ol ignorance of what might happen.
Has anybody else had to do this? One idea I had was to recirculate with RO or distilled water, thinking the minerals might dissolve into that.
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