Glycol guestion

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a good brand of hydronic glycol should last 10 years or more. 180- 200 degrees is not a problem for hydronic glycols.

To keep glycols healthy, first off the system should be cleaned and flushed before adding. also the water used to blend the glycol should be DI or DM water.

Hydronic glycols have inhibitor chemicials added. These scavange O2, buffer ph, lock up hardness, etc.

If the system is dirty, or hard water is used to mix the inhibitir package gets used up right away.

You can buy just the boost chemicals to add.

Test the ph, it should run 8-10. If it falls below 7, time to replace the fluid, as the cost of boost chemicals to bring it back would not pencil out.

If you do decide to flush and replace buy a cleaner and run it in the system for a few days first.

Also stick with brand name glycols Dowfrost HD, Nobel No-burst, and Hercules are 3 that I have had best results with.

Less expensive brands tend to have less inhibitors :)

hot rod

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Matt J

Glycol guestion

We have several snow melt systems that are several years old. All of them include propylene glycol solution. I have read that systems that run at a high temp will shorten the life cycle of the glycol? Some of these do not have heat-ex on them so they are probably running higher temps. First question what do the consider high temps? Will propylene degrade just like ethylene glycol in a vehicle, even if water is never made up in the system just by the heating process? Is it necessary to go out and recheck annually your glycol %? What do any of the rest you do? Also I do not know without looking if the glycol that we use all ready has additive in it, I'm sure this mite make a difference. Your input would be appreciated! Thanks Again!! Matt J.

Unknown

You need to talk to George

at Rhomar Water Managment.

Anything above 100ºF will cause degredation fairly quickly. All glycol breaks down. You just can't neglect the systemic fluid ia any SIM system for more than a couple of years. Anual testing and conditioning must be done. Having several of these systems out there, it would be of benefit to all involved to have some testing done on the fluid to insure it has the ability to do what it's intended to do. A simple pH test of the glycol will tell you how it's doing but, there's a whole lot more to it than that. CALL GEORGE!

Wallace Radiant Design

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bob_50

Matt

I use an american optical refractometer to check strength and a dow dowfrost test kit to test condition (ph). Dow recommends a max operating temperature of 250F.