Originally Posted by Viru
Interesting, never knew that! But do the tanks empty sequentially or are they all kept at the same pressure for a constant drain rate from all of them?
I was considering a similar thing a while ago, but with LPG. Since LPG tanks are much more versatile these days than CNG tanks, why don't car makers offer versions of their cars with just an LPG tank instead of a petrol tank so we don't have to compromise on boot space or sacrifice the spare tyre, while benefitting from the LPG?
I am not aware if there is a constant drain rate from the cylinders. My knowledge of single cylinder CNG goes like this.
CNG is stored at a pressure of about 200 bar unlike LPG which is stored at about 5-7 bar. In autos for eg, there is a 2 stage reduction process. 200 bar is first reduced to about 7 bar and in the next stage the pressure is reduced from 7 bar to atmospheric pressure.