let's consider blast control. In every HHO setup, there is generally an area where HHO is concentrated in a particular area.
This area can be the gas pocket at the top of a reservoir or Wet Cell container, or within a pressurized chamber. Sometimes this area can be a Liter in size or more. This is especially true for reservoirs or cell containers if the electrolyte level is allowed to fall below a certain level. This scenario should be avoided by keeping the electrolyte level high enough to prevent large standing pockets of HHO from forming.
When you have the potential for a large pocket of HHO to form, you should install one or more pressure relief valves. They should be designed to open around 20-PSI over the ambient pressure of the entire system. For instance, if you are running your system at 20-PSI, the blast relief port should open at 40-PSI. The design should also be able to safely dissipate a flashback and reseal itself, automatically.
We recommend the opening of the pressure relief valve to be AT LEAST 1/5th the diameter of the container it is attached to for each Liter of standing HHO. This number can be combined by installing multiple valves. In other words, if your reservoir has a 3 inch diameter with no more than 1 Liter of standing HHO, your blast relief should be at least .6 inches diameter. Of course, the larger the blast relief port, the better.