1322Liquefied Natural Gas LNG

When natural gas is cooled to a temperature of approximately -260°F at atmospheric pressure, it condenses to LNG. One volume of this liquid takes up about 1/600th the volume of natural gas at a stove burner tip. LNG weighs less than one-half the weight of water, actually about 45% as much. LNG is odorless, colorless, noncorrosive, and nontoxic. When vaporized, it burns only in concentrations of 5 to 15% when mixed with air. Neither LNG nor its vapor explode in an unconfined environment.

The liquefaction process removes the oxygen, carbon dioxide, sulfur compounds, and water. The process can also be designed to purify the LNG to almost 100% methane.

Once liquefied, natural gas is much more compact and occupies only 1/600th of its gaseous volume. This makes it economical to ship over long distances.

LNG tanks are always double-wall insulated construction. Large tanks are low aspect ratio (height to width) and cylindrical in design, with domed roofs. Storage pressures are less than 5 psig. Smaller quantities, 70,000 gallons and less, are stored in horizontal or vertical vacuum-jacketed, medium pressure (up to 250 psig) vessels. LNG must be maintained below -117°F to remain liquid.

Solar Stirling Engine Basics Explained

Solar Stirling Engine Basics Explained

The solar Stirling engine is progressively becoming a viable alternative to solar panels for its higher efficiency. Stirling engines might be the best way to harvest the power provided by the sun. This is an easy-to-understand explanation of how Stirling engines work, the different types, and why they are more efficient than steam engines.

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