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Liquefied petroleum gas (LPG) on the physical and chemical properties is a high grade fuel for automobile engines. major components of the CIS - propane and butane, which is a by-product of oil refining and gas-gasoline plant.

The gas mixes well with air to form a homogeneous fuel-air mixture, provides a high heating value, does not detonate when burned. In a gas, the minimum content of substances that contribute to carbon deposition polluting power system, as well as corrosive parts. During the combustion of gaseous fuel mixture of hazardous substances released into the atmosphere is formed minimal amount. The CIS consists mainly propane and butane, and ethane, ethylene butylene pentanes. Their total number in relation to the main fraction of gas (propane and butane) does not exceed 5-6%.

LPG components let you create the properties of gaseous fuel engine. while stirring propane guarantees an optimum vapor pressure of the gas mixture, which is particularly important for the operation of gas-cylinder vehicles in various climatic conditions and at different times of the year. Therefore, propane is a desirable component of the CIS.

Bhutan is one of high calorific value and is easily combustible components of the CIS. However, due to the low vapor pressure butane in our country in its pure form as a fuel is not used. Experience in operating gas-cylinder cars showed that the ratio of the CIS propane to butane in the winter should be 70-75% higher than in the summer.

Liquefied petroleum gas is colorless and odorless, so for safety when used in cars give him the special smell - odoriruyut. In our time, a measure of the quality of fuel octane number, which measures detonation resistance of hydrocarbon gases. The higher the octane rating of the fuel, means it is more resistant to detonation. For most of the main components of the gas octane number of 100-115, that is higher than the best grades of gasoline.