Compressed Natural Gas
CNG is gas that has been compressed such that it can be transported cost effectively in pressure vessels. Typical pressures for CNG applications range from 3,000 to 3,600 psi (205 to 245 bar). The compression ratio achieved at these pressures is about 300:1. In other words one unit of CNG yields 300 units of natural gas at normal pressure. Liquefied natural gas (LNG) by comparison yields 600 units of natural gas at normal temperature and pressure, but requires significantly more investment and process complication.
CNG is not new, over 6 million vehicles worldwide run on CNG and the number is growing at an annual rate of 30%*. CNG provides a cleaner and cheaper fuel than gasoline or diesel.
