Can the PE port of small pipes be welded by socket welding?
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Looking at the documents from the design institute for small pipes of DN15~DN40, it is required that the pipe ends be made of PE, while flanges are required to be of WN type. Generally, PE ends are used for socket welding, while BE ends are used for butt welding. Is the design above correct? Is there any standard or book that can explain it?
Your understanding is correct. PE (Plain End) ends are typically used for socket welding, while BE (Beveled End) ends are more commonly used for butt welding. It is common practice to use PE ends for socket welding on small pipes ranging from DN15 to DN40. For specific standards, you can refer to the following two: 1. **ASME B16.11** – This standard specifies the dimensions, markings, and material requirements for socket weld and threaded connections. 2. **ASME B31.3** - This is a standard for process piping, which details the design and installation requirements for various welded joints. These standards can help you better understand the requirements for pipe end treatment and the selection of welding methods. During actual implementation, ensure that operations are carried out in accordance with the design documents and relevant standards to guarantee the safety and functionality of the piping system. .
The specifications for PE and BE at the ends of pipes are set by the respective design institutes. WN refers to the high-neck flange type, which is required for important pipelines. The specific design institutes are indicated with their sources and origin boundaries in the figure below.
Plug welding is generally used, but thanks to the improvements in welding technology and the sufficient wall thickness of small pipes, butt welding can be employed without any problems, and there is no risk of making mistakes.