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API Spec 5L is the line pipe specification developed by the American Petroleum Institute, representing the most widely used standard in the global oil and gas industry. It covers various types of line pipes for transporting oil, gas, and water, serving as the "universal language" for onshore and offshore long-distance pipelines. Unlike industrial pipe standards such as ASTM A106, API 5L is specifically designed for pipeline transmission systems, with higher requirements for toughness, weldability, and pressure resistance.
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