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Old 02-28-2006, 09:05 AM   #1
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Default Bottle Bombs?

I think I overprimed my hefeweizen last night; My scales were calibrated way off before adding the glucose and I only noticed this morning - I used 225g for 19 litres which is well above the 190g I've been told is safe to use. Am I in danger of exploding banana bombs?

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Old 02-28-2006, 01:41 PM   #2
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You are probably ok, but I would play it safe and keep them in a cool place and with something around them to soak up flying glass just in case.

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Old 02-28-2006, 01:51 PM   #3
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Sounds like a lot to me. Even 190g sounds like a lot. I use around 125-135g for a highly carbonated hefe of 19L. I've never had bottle bombs so I don't know where the limit is, but I'd be concerned.

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Old 02-28-2006, 03:46 PM   #4
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Hmmm, decisions decisions!

I was aiming for high carbonation but this may be a little 'lively' (ahem)

Maybe I'm not measuring this correctly - here's how I normally measure my priming sugar:

I normally go for the equivalent of a teaspoon of glucose per 500 ml bottle (just under a pint). I equate this teaspoon to 5g.

So I estimate a 19L batch to be 38 bottles.

38 x 5 would give me 190. I've done this before and haven't had to take shelter.

225g works out at almost 6g per bottle; almost 15% higher than normal.

Maybe I'm just trying to convince myself that I haven't ****** up

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Old 02-28-2006, 04:02 PM   #5
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I've always measured priming sugars by volume rather than by weight. Your way sounds more accurate, that is if the scale is calibrated correctly.

What does 225 grams translate into cups as? Anything relatively close to one cup should be fine. Weigh some up and pour it into a measuring cup to see.

I guess you should just let the beer carbonate to your preference, then store the rest of the bottles in the fridge until they are drank.

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Old 02-28-2006, 04:17 PM   #6
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I go by weight. For 5g/19L of beer carbonated to 2.8 CO2 by vol (a high level of carbonation IMO) I would use about 5oz/140g (more than I initially thought). For another syle of beer with medium carbonation (2.3 or so) I would use 3.75oz/105g in 5g/19L of beer.

190g of corn sugar would be 6.7oz and would result in around 3.4 CO2 by vol which seems high to me, but perhaps is still within range for hefeweizen. I do generally speaking prefer a lower level of carbonation.

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Old 02-28-2006, 04:33 PM   #7
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I have difficulty converting between metric and imperial and dry and liquid weights so I normally rely on Google.

Problem is it says 1 *US* cup is 8 *FLUID* ounces. OK then... Then it says 8 fl oz is 235 ml. Um.. fine...

BUT here's my problem - 1 cup of table sugar will not weigh the same as 1 cup of glucose as glucose is finer and will weigh more in the same quantity. Now I know 8oz is 225 grams which is what I dumped in when bulk priming.

So I guess to answer your question I'll need to pose another one - can you compare dry weight and liquid weight - i.e. is 8 *fluid* ounces roughly equal to 8 ounces?

I think I need a beer

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Old 02-28-2006, 04:38 PM   #8
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Quote:
Originally Posted by bigears
So I guess to answer your question I'll need to pose another one - can you compare dry weight and liquid weight - i.e. is 8 *fluid* ounces roughly equal to 8 ounces?
It varies with the ingredient, but roughly 1/4 cup is 1.5 oz. for DME. Corn sugar is a little lighter...5 oz is about 2/3 cups, IIRC.
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Old 02-28-2006, 05:57 PM   #9
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I think you will be fine with your carbonation,It my be more that you like but hey its a learning experience just be sure to open the first one outside.

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Old 02-28-2006, 06:14 PM   #10
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When I was first brewing I bottled a mead way before it was done fermenting. I don't know exactly how much pressure there was, but when I opened them they blasted like champagne. Long story short... it takes A LOT of carbonation to make bombs.

But if you are worried, then keep them as cold as possible( but not freezing) ... that will reduce the amount of pressure on the glass.

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