Quote:
Originally Posted by rmay635703
Key here is we likely DON"T need to DIY an inexpensive 500psi flammable gas pump, they exist but I have never come in direct contact with them to write down models and brands.
Ah well.
|
Almost any AC compressor can pump flammable gas. I filled up my home heat pump with dry propane instead of R22 refrigerant. You can pump to 350-400 Psi using just a R22 AC compressor. R410a compressors can pump 500 Psi.
The problem is I have 2 large and heavy type 1 cng tanks. They are huge but only 3 ft3 together. Lets see how much CNG they will hold at 500 Psi:
500/14.7=34 compression
34x3=102 volume uncompressed
102/127=0.8 GGE...... not much......
I need 1200-1300 Psi to get 2GGE
This is why I am thinking about "second stage compression".
What about using hydraulic cylinder to compress gas? First stage can easily compress to 200 Psi and we only need 6 times ratio to get 1200 Psi.
Benefits of using hydraulic cylinders: not expensive, low temperature, low speed, easy to rebuild ($20-$30 seal kit)