Why use a long-necked butt welding flange?

Long-necked butt welding flanges are common dedicated connections used in industries such as energy, petroleum and petrochemicals. They are commonly found in complex piping systems that serve multi-storey buildings and refineries. But why are they considered the perfect pressure vessel connection for these piping systems? Here are some of the reasons: Example of a long…

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The difference between T91 alloy Pipe and P91 alloy pipe

T91 alloy tube, T91 alloy tube is a new martensitic heat-resistant steel developed by the National Like Tree Ridge Laboratory and the Metallurgical Materials Laboratory of the American Combustion Engineering Company. It is based on 9Cr1MoV steel to reduce the carbon content, strictly limit the content of sulfur and phosphorus, add a small amount of…

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P91 alloy steel pipe welding process technology

Due to the good high temperature comprehensive performance of P91 steel, it has been widely used in the main steam pipeline of Large Power Stations in China in the past ten years. This paper describes the welding characteristics, welding process, welding quality inspection, welding quality monitoring and development trend of P91 pipeline. In the construction…

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