I have an old toyota corolla e 100 sedan. A CNG cylinder is installed in my car because here it is cheaper than octane. I was thinking about setting up a good audio system in my car, which includes a 12 inch or mayb an 18 inch sub woofer. The cng cylinder is installed in the trunk. If I install a sub then it has to be put in the trunk too. So I was wondering would it be a problem for the cylinder? Like when I use really high volume with high bass bits? Will the sub woofer vibration cause any risk for the cylinder? TIA.

  • CNG = Compressed Natural Gas for those that don't follow.
    – Nick G
    Commented Sep 21, 2015 at 13:52

1 Answer 1


Fuel needs air to burn/explode/ignite

This video is ample evidence of that.

Acoustic vibration will have no impact on a CNG tank whose integrity isn't compromised (i.e. doesn't leak).

Even if the tank leaks gas into its surroundings, there needs to be a spark or naked flame to result in an explosion. Acoustic vibration alone won't be enough to cause ignition.

If there was even a remote possibility of igniting an air-fuel mixture with acoustic vibrations it would have been explored as an alternative to (comparatively complex) spark-ignition systems.

That said, there is more than one way a CNG tank can go bang. Consider the following:

  • electrical hazards from installing the subwoofer (electrical shorts, heating effect of high current)
  • mechanical integrity of the tank (leaks, corrosion)
  • heat in small enclosures
  • That was really helpful. Now I just got one question. I did not get the last line of your answer. By saying "heat in small enclosures" did you mean the sub woofer enclosure? If not then what? You know a speaker can get a little bit heat when it produces a lot of dB. So I was just curious which enclosures did you mean? Commented Sep 21, 2015 at 16:52
  • @WahidMasud I meant the space where the tank is installed. If the addition of your system is generating a lot of heat then the enclosure temperature will rise
    – Zaid
    Commented Sep 21, 2015 at 17:52
  • 1
    the good thing is, standard CNG install can take a lot of hat before problems occur. Those canisters are robust
    – Rory Alsop
    Commented Sep 21, 2015 at 18:24

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