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Tag Archive Difference Between LNG and LPG for sale

Difference Between LNG and LPG

LNG and LPG are energy sources. They are flammable, and combustion releases energy. Both are mixtures which are mainly composed of hydrocarbons. Both LNG and LPG are composed of gases, but they are converted to liquid form in order to store and transport easily. So they are stored under high pressurised conditions to maintain it as a liquid. But after vaporized into gaseous state, it is a highly flammable mixture.

Difference Between LNG and LPG

Difference Between LNG and LPG

Brief of Difference Between LNG and LPG

LNG (Liquified Natural Gas)

Liquified natural gas is abbreviated as LNG. This is a mixture of hydrocarbons, mainly composed of methane. It also contains small amounts of butane, propane, ethane, some heavier alkanes and nitrogen. LNG is odourless, non-toxic, colourless mixture. LNG is produced from natural gas. In a LNG plant, water, hydrogen sulphide, carbon dioxide and some other compounds (which will freeze under low temperatures) are removed. The environmentally harmful emissions from LNG are higher during the production, storage, and combustion. Therefore, special infrastructure facilities are there in production plants. So one disadvantage of LNG is the high cost associated with storage, transportation facilities, and infrastructure requirements.

LPG (Liquified Petroleum Gas)

Liquified petroleum gas is abbreviated as LPG. This is a mixture of hydrocarbon gases primarily containing propane and butane. Since it mostly contains propane gas, sometime LPG is referred to as propane. It is heavier than air. LPG is a flammable mixture of gases which is used as a fuel in motor vehicles and some other heating appliances (for cooking). LPG readily burns in air which makes it a good fuel for cooking and other purposes. When it is used to power the internal combustion engines in vehicles, LPG is named as auto gas. This is a clean fuel, and upon combustion, it produces fewer amounts of harmful emissions and carbon dioxide (which is a greenhouse gas).

Moreover, it is less expensive compared to gasoline. However, on the negative side, the availability of LPG is limited and also the number of miles a car can run from a full tank of fuel is fewer. So it has lower energy content. LPG is a fossil fuel, so it is produced as a by-product of petroleum refining. Further, it can be prepared by natural gas. LPG evaporates quickly at room temperature and pressure because it has a lower boiling point (which is lower than room temperature). So LPG is supplied in pressurised steel vessels. Leaking of LPG is hazardous. These leakages can be identified due to the odor of LPG. Although naturally LPG is odourless, addition of a stanching agent gives it a distinctive, unpleasant smell.

Difference Between LNG and LPG

• LNG mainly contains methane, and LPG mainly contains propane.

• LPG is commonly used in household whereas LNG is not. LNG is mainly used for other energy requirements.

• LNG is produced from natural gas, and LPG is produced from petroleum refining.

 Examples of LNG and LPG difference  applications in developing countries:

  • In Brazil, 98% of the households have access to LPG through government policies to develop the required infrastructure in all urban and rural regions, in combination with an LPG subsidy. Recently, due increased LPG prices, residents have begun switching back to woodfuel (IEA, 2006).
  • In 2001, 17.5% of Indian households (33.6 million households) used LPG as cooking fuel. Around three-quarter of these households were in urban areas; only 5.7% were rural households. Again, the LPG price is subsidised by the government. Increases in LPG prices are politically sensitive in India because of their effect on the middle classes, and recent increases in LPG prices have caused a move away from LPG. For instance, Climate Care is supporting a project in the Punjab to promote the use of briquettes made from biomass crop residues in cook stove. These cookstoves are half the price of the existing LPG stoves, and the payback time from the savings made is 18 months.
  • In China, 80,000 housing estates in Shenzhen have been converted to LNG. The price of natural gas was claimed to be lower and more stable than that of LPG and would not exceed 5 RMB/m3 (€0.43/m3). This is probably the result of the deal between China and Australia for the annual import of 3.7 million tons of LNG with a pricing mechanism that will ensure that the price is much lower than the current price for natural gas on the world market. However, the price of natural gas in Shenzhen would be higher than in Beijing and Shanghai due to the differences in the source and quality of gas, purchasing cost, construction and labour costs. In addition, the government supplies a subsidy for purchase of new equipment for LNG burning (Peoples Daily, 2006).