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Only if you plan to finish on your evaporator. I did batch boils for five years, and only went to probably 50% sugar max on the evaporator, before finishing the syrup on the stove. Never used a drop off defoamer, and never burned my pans.Quote:
Originally Posted by TapTapTap
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I've always used canola oil, works good for me.
ThanksQuote:
Originally Posted by DRoseum
Do you just add a drop or two when you start boiling, or do you wait until you have a foaming problem?
Is a drop or two good for 8 hours of boiling, or would you add a drop every four hours or so.
it will depend on many things, but typically we use a couple drops every time we fire our rig. early in the season we tend to use much less than later in the year. our first handful of boils we may not use it at all.
I use a ketchup bottle, like what you see in restaurants, for the canola oil. I have a 2 x 4 evaporator and begin with a couple of drops on the inlet side of the flue pan when I start up. Then watch as I boil and add oil when firing and if it starts to foam up.
I will pick up some canola oil and the ketchup bottle sounds like a good idea.
A drop when I fire up and another drop if they start to foam.
Watching a couple of You Tube videos, one person added butter and the other simply scooped out the foam.
There are two kinds of foam. The one that's the real problem, you can't scoop out.Quote:
Originally Posted by Swingpure
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Boy, I have a lot to learn!Quote:
Originally Posted by berkshires
Yes you do. Lol and the biggest thing to know is that you NEVER leave your boil unattended or un watched. You can watch that sap boil for hours and days with no problems but the minute you turn your back on it disaster can happen. You would be hard pressed to find a sugermaker that hasn't scorched his or her pan at the least. I did it on my first boil right at the end of the day and seen my first batch of beautiful syrup turn to ugly black ash and a scorched and warped pan. Not a good feeling!Quote:
Originally Posted by Swingpure
In a nutshell:Quote:
Originally Posted by Swingpure
"Foam" refers to two things:
1 - There is a type of foam formed of big light bubbles that form and pop quickly. It forms all the time, but some sap does this more than others - it may depend on the tree and or the time of the season. The main downside of this foam is that it leaves residue on the side of your pan, which (especially if you have high heat on the sides of your pan) can scorch a little. This is not a very big deal, but can lead to off-flavors in your syrup - mostly a burnt-caramel type flavor. And it's typically very subtle. The solution to this can involve scooping foam if you like, but I always ignored it. The thing is, if you don't have heat on the sides of your pan it won't scorch, so it's just not an issue. I guess if you have a super-hard boil you could get enough of this type of foam that it could cause some of the foam to boil over the sides, which would not be good.
2 - The second type of foam does not happen all the time. It only happens when sap gets close to syrup. Then the consistency changes. It gets much thicker, and when it boils, you get lots of small bubbles that don't pop as quickly, but instead tend to build up. Think of a liquid flowing sponge. I know you recently made maple candy, so you may have noticed that if it boils hard it will boil over. On the stove you can just turn the heat down, but on the evaporator, not only you can't you, but you don't want to. Instead if you add defoamer it can make the bubbles pop faster. So what is the risk of this kind of foam?
The risk is huge. First of all, this foam is progressive. The foam is an insulator. The more it foams up, the less heat gets released, causing even more of the syrup to foam. So bad goes to worse very fast. Second of all, down at the level of the pan, once the foam gets past a certain point, there's nothing but foam touching the surface of the pan. Foam is not a good heat conductor, so your pan can quickly go from 219 to 800 degrees. You now have horribly scorched sugar on your pan, and these temperatures will permanently warp your pan.
In addition to destroying your pan, you can also have all your syrup destroyed by having all that horribly burnt sugar (and nitre) in it. If that's not bad enough, your syrup can also boil over, making a big sticky mess, and even catching on fire.
The key thing about foam type 2 is that it typically only happens as your sap gets to high sugar percentage. So if you only go to 30 - 40% sugar on your evaporator, and then finish elsewhere, you may not need to worry too much about it. On my old setup, I didn't use a drop of defoamer for 5 years.
Hope that helps,
Gabe