I will like to make a correction here. In Pakistan CNG system is operating at 200 Bar and not at 200 psi. 200 bar is about 2900 psi (Approximately). For a comparison the tyre pressure in a normal car is about 25 to 30 psi. It means that pressure in CNG cylinder is about 100 times more than that of a tyre.
But a tyre is made of rubber and CNG cylinder is made of steel. As I have already mentioned in an earlier post that the CNG cylinders are safe as these are made of special steel and do not have wleded joints.
@Player has rightly pointed out that gas at home is same but comes at very low pressure (2 or 3 psi). Therefore it needs compression to 2900 psi for which you need a compressor.
@datzburier . I also read about this compressor in an article and it takes nine to ten hours to fill a Honda Civic CNG version. It runs on electricity and is professionally installed and maintained by specific companies. This is because CNG station are not common in USA, whereas in Pakistan this is no problem.
However I am sure that CNG station in Pakistan under stricit survelience of Pakistan Hydrocarbon Institute (PHI) and their systems are checked periodically. Any engineer in living in Pakistan must verify it and inform us all.
When I was in Pakistan I got my CNG cylender cheked by PHI for Rs 500. It was an old cylinder imported from New Zealand and was manufactured in 1984. It was rechecked when it was imported to Pakistan. It was installed in my car in 1997 so after 5 yrs in 2002 I checked it again. However no one adviced me to do so.
I request all CNG users to trace the history of thier CNG cylinders and keep an eye on their life and checking. Its for your own safety.