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Safety Issues: Spirig Switzerland

Safety Issues

The electrolysis of water creates a combustible optimized mixture of 2 parts Hydrogen (H) and 1 part Oxygen (O). The combustion of this gas mixture, also termed as detonating gas, again creates a few drops of water in vacuum. The combustion of the gas mixture by burning as a stable flame is, provided the needed knowhow is available, absolutely safe. Only very low gas pressure levels do exist and also there is only about a four liter of gas in the system at any time.

No gas storage, it is JIT (just-in-time) gas production synchronized to the consumption. This means almost  1/100'000th  of energy stored when compared to pressurized gas bottles, eg acetylene.

The Spirflame® has several independent multiple level staged gas excess pressure safety  circuits.

Even a flash-back introduced into the Spirflame® interns will be safely absorbed by the hi-strength tank volume design, patented USA 5,217,507  / Europe 0462825 / Germany  DE 691 17 354.

A Spirflame model 250HP produces per hour a max of 250 liters of gas mixture, of which 2/3 are hydrogen (167 liter).

The LIL (lower ignition level), is 4 vol%.
That means a model 250HP could feed its full gas output for 14 minutes into a closed / sealed volume of 1 m3 before the LIL of 4% would be reached.    

A free gasing-out of a Spirflame® in a normal room environment can be considered as 100% safe.


Physics of the combustion of a mixture of 2 part Hydrogen + 1 part Oxygen  

  1. Mixture of 2H + 1O burns / recombines into some drops of water.
  2. Vacuum results from this combustion. No pressurized media, as caused by combustion of ordinary gas will remain in system.
  3. During combustion pressure spike duration is about 8 - 15 millisec. Spike might rise for a few ms to 18 bar.
  4. Total duration of such a pressure increase is 15 to 25 millisec.
  5. Energy released by  the combustion is mainly an acoustic <bang> + heat safely absorbed by the fluid and tank material.