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Old 07-27-2008, 04:00 PM   #1
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Default Create gallon markings on a brewpot?

Is there a way to mark the inside of a brewpot with gallon markings. I bought my brewpot on the internet and didn't realize it didn't have the gallon markings (thought it was standard). I thought I would be able to keep track of the mash/sparge runnings but I lost track quite quickly. Having markings in my pot would help, so instead of remembering how much wort comes out of my mash tun, all I have to do is remember how much comes out after the five gallon marking.

I thought about marking it with a sharpie, but figured that would wear off in a stainless steel pot? Any ideas/suggestions?

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Old 07-27-2008, 04:03 PM   #2
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Mark your brew spoon in half gallon increments as you fill it up. I'm not sure how long it will last with a sharpie, but I use a yard stick that has been notched and it works great for any keg I have as a measuring tool.

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Old 07-27-2008, 04:17 PM   #3
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Mark your brew spoon in half gallon increments as you fill it up. I'm not sure how long it will last with a sharpie, but I use a yard stick that has been notched and it works great for any keg I have as a measuring tool.
That's what I did...I tired scratching the inside of mine, but gave up. Doing my spoon was much easier.
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Old 07-27-2008, 04:20 PM   #4
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Yep, in the brewery I learned this technique, lol. We had a wooden curtain rod notched with gallon setting that worked great in that huge kettle. I just had to transfer that to my home brewery. I even use it when cleaning kegs, just dip and check in that tiny Sanke hole, lol.

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Old 07-27-2008, 04:33 PM   #5
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How much does temperature affect water volume? Has anyone calibrated their notched measuring stick for different temperatures? I made mine when ground water was 80 degrees. It's a little cooler than that in the winter (maybe 70 degrees). But I measure the post-mash pre-boil runnings to calculate mash efficiency, and that is a much higher temperature than my baseline measurement temperature of 80 degrees. How much off would a volume measurement at 150 degrees be compared to 80?

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Old 07-27-2008, 04:40 PM   #6
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How much does temperature affect water volume? Has anyone calibrated their notched measuring stick for different temperatures? I made mine when ground water was 80 degrees. It's a little cooler than that in the winter (maybe 70 degrees). But I measure the post-mash pre-boil runnings to calculate mash efficiency, and that is a much higher temperature than my baseline measurement temperature of 80 degrees. How much off would a volume measurement at 150 degrees be compared to 80?

That's just a wee bit too anal for me to be concerned about...

I'm only really using it to guestimate the volume of wort in the kettle after I've drained my mashtun and sparged, to see if I need anymore...and to see just how much loss I have post boil....

For anything that requires any measure of accuracy I use measuring cups.
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Old 07-27-2008, 04:45 PM   #7
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I used this to make a measuring stick out of aluminum. You might be able to use it directly on your pot as well.
http://www.harborfreight.com/cpi/cta...emnumber=35121

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Old 07-27-2008, 05:03 PM   #8
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The graph on this page shows approximately 4% difference between room temperature water volume and boiling water volume. So, for a 6.5 gallon boil, the volume difference is ~1 qt. To me, that's pretty negligible, but it could be significant for a more anal brewer.

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Old 07-27-2008, 07:14 PM   #9
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Hmmmmm. Now I guess I'll have to work up a temperature-volume sliderule dipstick for accurate measurements at various temps.

Seriously, I think a quart at 6.5 gallons and approaching half a gallon for a 12 gallon batch is significant enough to make it worthwhile to at least calibrate a stick at two temps... average groundwater temperature and mash runnings temp. Or at least correct for the difference on paper.

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Old 07-27-2008, 07:20 PM   #10
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I used a dremel to mark the 7 gallon level and the 5.5 gallon level. Make sure you have your immersion chiller in place when you mark your finished level.

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