How accumulators balance pressure

We operated with a pressure difference of 1 to 21/2 psi with the hydrogen side at the higher pressure, and this worked well. The ideal would be to maintain a pressure differential of about 1 psi. At a difference of about 2Vz psi, there should be no crossover in the electrolyzer, however, be sure the pressure is always higher on the hydrogen side than on the oxygen side. 

On the oxygen side, the volume of the oxygen tubing, and the portions of oxygen duct inside the electrolyzer that will contain oxygen (above the liquid level line), when added to the volume of the accumulator should be half the volume of the hydrogen side of the system. 

With a general idea of the volume needed for the accumulator, you can then look for off-the-shelf parts, or fabricate something. If you find an off the-shelf part that comes close, the volume on the hydrogen side can be adjusted somewhat by varying the liquid level of the bubbler system, as discussed previously. However, do not fill bubblers more than % full with scrubbing liquid. 

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