{"id":197,"date":"2019-02-08T15:48:10","date_gmt":"2019-02-08T15:48:10","guid":{"rendered":"http:\/\/www.mikeandpen.net\/beer\/?page_id=197"},"modified":"2019-03-08T14:59:15","modified_gmt":"2019-03-08T14:59:15","slug":"priming-calculator","status":"publish","type":"page","link":"https:\/\/www.mikeandpen.net\/beer\/priming-calculator\/","title":{"rendered":"Priming Calculator"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/jadzia.perpetual.name\/priming.html\">https:\/\/jadzia.perpetual.name\/priming<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why is this one different?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This differs from other calculators in that it takes into account the headspace of the pressure vessel. Standard priming sugar calculators assume that the headspace is a couple of orders of magnitude less than the volume of beer. If you&#8217;re filling a corny keg then this assumption is perfectly valid and should give good results. Also, if you&#8217;re using forced carbonation, none of this matter because you keep the pressure fixed by topping up from a cylinder.       <\/p>\n\n\n\n<p class=\"card-text wp-block-paragraph\">However, if you&#8217;ve got a plastic barrel (which tend to be about 25L) and you&#8217;re only brewing 20L then you&#8217;ll be slightly out with your sugar calculations. Use the above calculator with the defaults and just change the Headspace volume between 0.1L and 5L you&#8217;ll see that the Mass of Glucose changes between 93.2g and 111.5g. That&#8217;s a 19% difference, which equates to an actual carbonation of 1.82, not 2.        <\/p>\n\n\n\n<p class=\"card-text wp-block-paragraph\">Of course, if you&#8217;re only half filling a corny keg or barrel then these differences will be much greater. Above, if you enter Beer: 19, Headspace: 0.1 you get &#8220;88.6g&#8221;. If you use 10\/9.1 you get 80.4g. Not much difference? But you&#8217;ve got almost half the amount of beer! If you use the excellent Brewer&#8217;s Friend priming calculator the former is 86.5g and the latter is 45.5g &#8211; much lower. 45.5g in a half empty keg translates to about 1.53 volumes of CO2, which is quite a way off your desired 2.       <\/p>\n\n\n\n<p class=\"card-text wp-block-paragraph\">This calculator works out how much CO2 needs to be in the beer to reach the       right carbonation level, the associated head pressure, how much CO2 is       in the head then, from those, how much glucose is needed to make that       mass of CO2. It also accounts for any dissolved CO2 from the       fermentation. As a bonus it also works out what pressure you&#8217;d need to       completely carbonate the beer in a single application of gas, rather       than top-ups. In practice, unless you have a lot of head space and are       the temperature is low, your gas cylinder won&#8217;t have enough pressure.       <\/p>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/jadzia.perpetual.name\/priming Why is this one different? This differs from other calculators in that it takes into account the headspace of the pressure vessel. Standard priming sugar calculators assume that the headspace is a couple of orders of magnitude less than the volume of beer. If you&#8217;re filling a corny keg then this assumption is perfectly &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.mikeandpen.net\/beer\/priming-calculator\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Priming Calculator&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-197","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.mikeandpen.net\/beer\/wp-json\/wp\/v2\/pages\/197","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mikeandpen.net\/beer\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.mikeandpen.net\/beer\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.mikeandpen.net\/beer\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mikeandpen.net\/beer\/wp-json\/wp\/v2\/comments?post=197"}],"version-history":[{"count":7,"href":"https:\/\/www.mikeandpen.net\/beer\/wp-json\/wp\/v2\/pages\/197\/revisions"}],"predecessor-version":[{"id":237,"href":"https:\/\/www.mikeandpen.net\/beer\/wp-json\/wp\/v2\/pages\/197\/revisions\/237"}],"wp:attachment":[{"href":"https:\/\/www.mikeandpen.net\/beer\/wp-json\/wp\/v2\/media?parent=197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}