Brewing Master » Breweries » CO2 Pressure in Beer Bottles
CO2 Pressure in Beer Bottles
Question:
: I used a BLATZ longneck bottle. I filled it with H2O and sealed it with : a cork form a wine bottle. I drilled a small hole in a bottle cap and : put it over the cork. I made a tubing system that had a pressure guage in : it and valve to regulate the air. I put a 20 guage needle through the hole : in the cap and into the bottle. I connected the tubing onto the needle : and pressureized the system. At 95 lbs/inch I quit. The bottle did : not burst. I did have a minor amount of leakage but even 3/4 of 95 lbs : is a considerable force on that bottle. : For safety, I wrapped the bottle in a big towel and taped the towel : on with wide duct tape. It was not necessay as it turned out. FOR SAFETY!! When you pressure test a vessel USE WATER for the pressure. Air is compressable and thus stores up energy, when the energy is realeased it will propell the glass with all the stored up energy it has. Water is not compressable (at least not much) thus it does not realese stored energy when the vessel burst and makes for a much less violent bursting. The results are the same. Pounds Per Square Inch is the same no matter what the medium. PLEASE be careful if you are going to try this experiment. I will do this experiment in the next week for you all. I can do it safely and would rather you all wait for my results instead of running the risk of hurting yourselfs. Dave Parsons
Response:
NFSome time ago, I posted a request for information about the bursting NFpressure of beer bottles. I didn’t get any information and was There are different bottles in many places on the Earth. In Finland there are return bottles of 1/3 litre. They can stand 12 bars. However, the usual pressure in a bottle of lager at 20 C is only 2 bars. The safety margin is quite wide. Note, that some breweries pasteurize the beer in the bottles. The temp goes up to about 65 C and the pressure in the bottle depends on – CO2 content in the beer (ie. lagers have 0.45 %) – the size of the gas space in the bottle: free space, % pressure, bar 5.0 3.75 4.0 4.65 3.0 6.75 2.5 9.65 Ari J.rm.l. (Scandinavian diacritic characters) o Ari Jarmala (the three ‘a’s are umlauted) 60 19′49" N
Response:
Some time ago, I posted a request for information about the bursting pressure of beer bottles. I didn’t get any information and was a bit surprised. We all use bottles in our hobby but don’t really know much about them. I did some experiments and these are the results. I must say that I would love for some of you to repeat my experiments for verification. I used a BLATZ longneck bottle. I filled it with H2O and sealed it with a cork form a wine bottle. I drilled a small hole in a bottle cap and put it over the cork. I made a tubing system that had a pressure guage in it and valve to regulate the air. I put a 20 guage needle through the hole in the cap and into the bottle. I connected the tubing onto the needle and pressureized the system. At 95 lbs/inch I quit. The bottle did not burst. I did have a minor amount of leakage but even 3/4 of 95 lbs is a considerable force on that bottle. For safety, I wrapped the bottle in a big towel and taped the towel on with wide duct tape. It was not necessay as it turned out. I know that the manufacturers of these bottles know exactly how much pressure it takes to burst one of them. But how does one find out what that is? Who makes these bottles? Anyone know? Anyone? Norm —