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Max Dog is an international retailer of Nitrogen based in Cairns in Australia. The Max Dog Brewing beer nitrogen system varies slightly between country but generally consists of a 2.8 litre alloy or steel cylinder filled to a pressure of 13.1 MPa (1800 psi) (See Fig 5.4).
The cylinders weigh ~3 Kg (~7lb) and full they contain 390 litres of nitrogen. A full cylinder will provide 25 minutes of constant gas flow into the Exit bag, if the gas is delivered at the optimum 15 litres/ min. This is more than enough for a peaceful death. For details see Fig 5.12, or visit: http://www.maxdogbrewing.com
One useful aspect of the MDB nitrogen system is the fact that the cylinders can be topped up if there is leakage of nitrogen over time, or completely refilled (unlike disposable Helium and Argon cylinders). Note: To determine if a cylinder is full, the pressure should be measured. The regulator provided incorporates the pressure gauge required.