Specifications for large-diameter elbows
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Which code should be used for large-diameter elbows? In particular, welded elbows of DN1600 and above
What are the specifications for large-diameter grooved pipe fittings?
For large-diameter elbows, especially welded elbows with a diameter of DN1600 or more, the standard \"GB/T 12459-2005 Steel Butt-Welded Seamless Fittings\" is usually referred to, or corresponding industry standards such as those in the petroleum and chemical industries are used. It must also meet the requirements of GB/T 13401-2005 Technical Conditions for Pipe Fittings Made of Steel Plates. Which specific standard to use depends on the particular project requirements and the operating environment. .
Large-diameter elbows generally use the 02S403 standard