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The Peaceful Pill Handbook Ensuring a Cylinder is Full
When using a cylinder of compressed gas, it is important to establish that there is sufficient gas available for a peaceful hypoxic death. For compressed gas in cylinders, the easiest way of ensuring this is to measure the pressure. This is particularly important for cylinders that have been kept in storage for long periods.
If using the Max Dog Brewing nitrogen system, the pressure will be shown by the gauge on the regulator supplied. To measure the pressure, turn the regulator flow rate to 0 litres/min and open the cylinder to read the pressure. This should be ~12MPa (1750psi) (see Fig 5.4).
For Balloon Time and similar helium cylinders, the Exit pressure gauge that fits the flow control makes testing the pressure simple. A full cylinder should have a pressure of ~ 1.7MPa (250 psi). Some of these cylinders have been found to have faulty taps and to be near empty on purchase. This is why the Exit pressure gauge is so important to use (see Fig 5.10 & 5.11).