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Switching to Natural Gas

Discussion in 'Alternative Fuel Forum' started by steve4611, Jan 24, 2012.

  1. lawnservjoe

    lawnservjoe LawnSite Member
    Messages: 6

    I have been running propane the last few years. Kwik Trip stores have installed CNG pumps. 1.65 a gallon. Could you give me info on that CNG tank.
    Also is my Kawa 21hp FH ok to run CNG. I think my propane parts will also work with CNG. If you have info on this let me know. thanks, Joe
  2. olde_blue

    olde_blue LawnSite Senior Member
    Messages: 349

    Here is a link to a site that sells small (2.5 gge tanks, 85 lbs) inexpensive Type 1 (steel) tanks: http://www.americancng.com/categories/Cylinder. A similar Type III tank (only 46 lbs) is found here (no price): http://www.luxfercylinders.com/products/alternative-fuel-cylinders/443-type-3-alternative-fuel-cylinder-specifications You will need strong brackets to mount the tanks without damaging them. They can be expensive. You will need alot more parts to convert to CNG from propane. Here is a schematic for a low-pressure CNG conversion for a carburated automotive application: http://www.pngtechnologies.com/PDF_Files/Auto_Dual_Fuel_CNG_Gasoline_Over_Schematic.pdf. You will need most of the same components. Here is a site that sells some CNG/Propane conversion parts for small engines: http://www.propanecarbs.com/tri_fuel_kits.html. They do not have duel-fuel kits for mower engines. A site for CNG info for autos and some other conversions: http://cngchat.com/forum/forum.php.
    Beware, I have no practical experience with CNG. I have only done a bit of research. Here are three cautions I have come across: (1) CNG gas stations may not allow you to fuel your mowers, since they are not factory conversions. In my area, there is only one station, so home refueling would be my main option. (2) Natural gas burns hot; in specially built engines they use hardened valves. You may be able to counteract this with a water-injection system. (3) Engines produce less power on natural gas than propane or gasoline.
  3. designman

    designman LawnSite Member
    Messages: 9

    I worry about long term, i have natural gas at my shop and the compressor for filling is 5-7k, and Nat gas prices are going up. Sure would hate to get stuck before thing pay for themselves

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