I used to work for a company that specialized in CNG stations. The first thing you need to know is the make-up of the gas off the well head. I think you want about 95% methane to run on. The next is the water content, it needs to be lower than 6%, but a dessicant dryer will take care of that. Like what was said earlier, Hydrogen sulphide mixed with water makes sulfuric acid, bad stuff. We use a three of four stage compressor to take it to 4500psi. You can run on 3000, but will have to fill more often. Cars started to run on that then went to 4500 for storage. We had to cool the gas between compression stages, because compression causes heat. You could use a smaller compressor and run a long time to reach the pressure, but you need a compressor to do that. There are some old ingersol rands out there that will work. Most CNG programs in the stated are buses or commercial fleets. CNG is very popular in SE Asia. Most well hed gas is either burned off or used for process heating.
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Today's Featured Article - A Question for Dads This recent topic from the Tractor Talk discussion board is being highlighted because it is an awesome display of the caliber of individuals that have made this site their own. The young person asking questions received positive feedback and advice from total strangers who "told it like it is" with the care many reserve for their own kids. The advice is timeless... so although it isn't necessarily antique tractor related, it will be prominently displayed in our archives to honor those who have the courage to ask and those who have the courage to respond in an honest, positive manner.
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