Bottle conditioning carbonation

Discussion in 'General Brewing Discussions' started by Gledison, Oct 20, 2017.

  1. Gledison

    Gledison Active Member

    Joined:
    Jun 8, 2017
    Messages:
    149
    Likes Received:
    48
    Trophy Points:
    28
    Hi everyone.
    I would like to check with you regarding carbonation directly in the bottle.
    I´m Aware of the recomended values for different beers as well the formulas needed to achieve the Targets.
    Mostly i´m targeting a 2.5volumes of CO2 which requires ca. 2.2g of table sugar for a 330ml bottle.
    I have a Manometer coupled to a 330 ml coke bottle which i use to follow the carbonation. At 20°C (68 °F) im getting at the end of 7 days conditioning ca. 4 bars (58 psi) of pressure. This value gives me a 8.2 g/L CO2 = ca 4 Volumes CO2.
    Am im missing something here?
    Acutally, im quite happy regarding the carbonation (head, mothfeel,etc). In my first brew i´ve used 2g of sugar and i missed some CO2, after that im keeping 2.2 and the outcome is good enough. However the values are not matching somehow. Am i just overcabonating and somehow enjoying it? :p
    thanks for any comment
     
  2. illingwd

    illingwd Member

    Joined:
    Oct 14, 2017
    Messages:
    33
    Likes Received:
    5
    Trophy Points:
    8
    All those calculations look right. If the beer has the right head and doesn't explode out of the bottle, are you sure your pressure reading is accurate? 4 volumes would be overcarbonated for almost any style I think.
     
  3. Gledison

    Gledison Active Member

    Joined:
    Jun 8, 2017
    Messages:
    149
    Likes Received:
    48
    Trophy Points:
    28
    My manometer could be the Problem. I'm not sure. At least I'm following the common knowledge and adding the suggested amount of table sugar for a 2,5 Volumes. The main reason I have a control manometer is to be sure I'm getting carbonation ;)
     
    J A likes this.
  4. jmcnamara

    jmcnamara Well-Known Member

    Joined:
    Aug 29, 2012
    Messages:
    2,457
    Likes Received:
    1,947
    Trophy Points:
    113
    Gender:
    Male
    Location:
    Rosedale, MD
    forgive my ignorance, but does the manometer measure the co2 absorbed in the beer or just the amount in head space?
    it takes a little while for the beer to take in all that gas
     
  5. Gledison

    Gledison Active Member

    Joined:
    Jun 8, 2017
    Messages:
    149
    Likes Received:
    48
    Trophy Points:
    28
    After equilibrium, it measures the total amount of pressure in the bottle. the pressure in the headspace is the same inside of the liquid. its all distribuited. By cooling down, CO2 will be more dissolved in the liquid, therefore a little less pressure will be measured in the manometer.
    I believe my problem has to do with residual sugar. I have other batch and its measuring 2.5 bars.
    I will keep tracking this one and see how it goes. the good thing is that I have mostly Grolsh bottles, so I can release the pressure if its too high :)
    cheers
     
    jeffpn likes this.
  6. Head First

    Head First Well-Known Member

    Joined:
    Dec 22, 2012
    Messages:
    2,254
    Likes Received:
    2,455
    Trophy Points:
    113
    Location:
    Back in the mountains
    Are you calculating temperature into your equation? I force carb so am not working with sugar anymore but I know temperature served is the co2 vol you are looking for and there is a big difference between room temp and frig temp in volumes.
    [​IMG]
     
  7. Head First

    Head First Well-Known Member

    Joined:
    Dec 22, 2012
    Messages:
    2,254
    Likes Received:
    2,455
    Trophy Points:
    113
    Location:
    Back in the mountains
  8. Gledison

    Gledison Active Member

    Joined:
    Jun 8, 2017
    Messages:
    149
    Likes Received:
    48
    Trophy Points:
    28
    Yes, im calculating considering the temperature.
    I think the only explanation is residual sugar. I have a new batch now and its around 2.6 bars. A bit high but still ok i believe..
    thanks mate.
     

Share This Page

arrow_white