SpudFiles

A single compressor won't do it, you need to have a series of them cascading.

but how?

the output of one compressor is fed into the input/inlet of another compressor

but personally I don't it's a good idea to use fridge compressors to fill CNG tanks... IIRC the highest pressure that anyone achieved and reported here on SF was just over 1000 psi and the compressor broke down within minutes


Don't get me wrong - fridge compressors are awesome - they are designed to compress refrigerant to about 180psi (12bar)
yet they can be used as cheap high pressure compressors and reach pressures as high as 500 psi or greater

But you want to use a product designed to reach 12 bar and turn it into a 200 bar CNG compressor

What POLAND said.

http://www.spudfiles.com/forums/1800psi ... 17278.html

This guy claims to have reached 120 bar with difficulty.

Maybe something like this is more suitable for your application? http://www.shoeboxcompressor.com/

What JSR said ^^^ The shoebox is a good inexpensive choice. It works hard and needs to be kept in top shape, but can get the job done.