specific gravity of boiler antifreeze

specific gravity of boiler antifreeze

PostBy: 1975gt750 On: Wed Jan 29, 2014 11:49 pm

Can you use an automotive hydrometer to check specific gravity of boiler antifreeze?
what should the specific gravity be for a in house boiler be?

Thanks chris
1975gt750
 
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Re: specific gravity of boiler antifreeze

PostBy: mozz On: Thu Jan 30, 2014 8:26 am

Different types of auto antifreeze have different specific gravity, so you use a tool calibrated with both scales. I just bought a refractometer on Amazon and would never use the floating ball type again. I'm sure boiler antifreeze specific gravity can be found and a automotive tool can be used to get you in the ball park. You can buy tests strips to test your boiler antifreeze, they shouldn't cost too much.
Last edited by mozz on Thu Jan 30, 2014 8:34 am, edited 1 time in total.
mozz
 
Stoker Coal Boiler: Axeman Anderson 1982 AA-130 Steam

Re: specific gravity of boiler antifreeze

PostBy: VigIIPeaBurner On: Thu Jan 30, 2014 8:33 am

The automotive antifreeze gauge is calibrated for ethylene glycol. Most likely you'll be using propylene glycol in your boiler. It would get you close but it would not be accurate. Commercial antifreeze lens usually have an inhibitor package in them that could slightly affect the specific gravity of the solution.

Go on the Internet and look for charts that would give you the specific gravity, freezing point, boiling point, specific gravity's of solutions for both propylene ethylene glycol. Then you just have to convert from the automotive antifreeze gauge reading to propylene glycol.

Here's two links to start . . .
propylene glycol

ethylene glycol
VigIIPeaBurner
 
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Re: specific gravity of boiler antifreeze

PostBy: mozz On: Thu Jan 30, 2014 8:36 am

Refractometers are calibrated in both scales, that's why i mentioned it.
mozz
 
Stoker Coal Boiler: Axeman Anderson 1982 AA-130 Steam

Re: specific gravity of boiler antifreeze

PostBy: VigIIPeaBurner On: Thu Jan 30, 2014 10:34 pm

mozz wrote:Refractometers are calibrated in both scales, that's why i mentioned it.

Yes, indeed there are instruments that are. Refractometers come calibrated to many scales, even an arbitrary scale like the one I use. And it's probably just what he really should get. His original post was could he use an automotive style to check the %PG in his boiler loop.
VigIIPeaBurner
 
Hot Air Coal Stoker Furnace: Keystoker Koker
Hand Fed Coal Stove: Vermont Casting Vigilant II 2310
Other Heating: #2 Oil Furnace