Regarding the scope of application for socket welding
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Dear Haihao friends! Is socket welding suitable for high-temperature and high-pressure steam pipeline systems? In which standard can one find the scope of application for socket welding?
Plug welding generally involves inserting the pipe into a flange and then welding it; the weld seam resulting from plug welding cannot be inspected using radiographic testing. It is mainly used for welding small-diameter valves, pipes, fittings, and pipelines. . Based on analyses of factors such as weld strength and stress conditions, butt welding is superior to socket welding; therefore, it is advisable to use butt welding in applications with high pressure levels or under harsh operating conditions.
Any flange standard specifies the applicable ranges for different types of flanges; for temperature issues, one can simply refer to the temperature-pressure chart corresponding to that pressure
In my project, there is a high-pressure steam pipeline made of P91 material; the operating pressure is 10.5 Mpa and the temperature is 550 degrees. The bypass pipelines have DN25 and DN20 pipe flanges, and all the valves are of the socket-type design. The valve is 2500 pound socket weld.
Can socket welding be used in high-temperature and high-pressure pipeline systems? Anyway, that’s how the design drawings provided by SEI are designed. All pipes of DN25 and below are socket weld type
Yes, the wall thickness of the small tubes is increased. Socket welding is used mainly due to the difficulties associated with welding, as well as considerations related to the pipe diameter
Yes, the P91 material is quite special; when using butt welding, argon gas protection is required. Using socket welding may reduce some of the difficulties associated with construction. Regardless of the welding method, as long as it can meet the requirements of the operating conditions, that’s sufficient.
The gauge provided at 32 points is the standard one; you can use it by referring to the pressure range, and there will be no issues.