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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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