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The Gas Source (Nitrogen or Helium) 1. Nitrogen and the Max Dog Brewing Delivery System
Nitrogen is a very common gas, making up ~ 80% of the air we breath. The gas is cheap, in no danger of running out, and readily available. Nitrogen is not restricted and no questions are asked about why one would want a source of this gas. Indeed, home brewers use the gas in beer dispensing systems, when they want to achieve the fine bubbles and a creamy head similar to Guinness stout (Nitrogen is used to aerate Guinness stout).
Since 2012, cylinders filled with nitrogen have been available from Max Dog Brewing (www.maxdogrewing.com). These high pressure cylinders contain ~400 litres of nitrogen, and can be refilled.
Regulating the Flow of Nitrogen
Max Dog Brewing nitrogen cylinders ship with a custom flow control regulator (see Fig 5.4b). These regulators incorporate a pressure gauge which indicates the pressure in the cylinder. They use a click setting to adjust the flow rate. The optimum flow rate for a peaceful death (15 litres/ min). The delivery hose that takes the nitrogen from the cylinder to the Exit Bag fits directly on to the regulator outlet.