Ask everyone: Is there any requirement for the spacing between longitudinal seams on a cylinder of a pressure vessel? Where is the source?
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Just like the title! I've always been a little confused. I seem to have found that there are boiler standards, but I didn't see specific requirements in the solid capacity regulations and GB150.
I have not found clear regulations on the spacing between longitudinal seams on a cylinder of a pressure vessel. In "GB 150-2011 Pressure Vessels" and other Chinese * * In the standard, the provisions on the spacing of longitudinal joints are not clear. This may be because the design and manufacture of pressure vessels involves multiple factors, including the nature of the material, the design pressure of the vessel, the working environment, etc. Therefore, the determination of the longitudinal seam spacing needs to be based on specific design and use conditions. In relevant regulations such as the "Boiler and Pressure Vessel Manufacturing Supervision Regulations", there are specific requirements for weld arrangement, weld distance, etc., but these are usually based on safety and reliability considerations. In general, if you have questions about the spacing of longitudinal seams when designing or manufacturing pressure vessels, you may need to consult a professional engineer or consult relevant engineering manuals and standards. At the same time, it is also necessary to determine the most suitable longitudinal seam spacing based on the actual use conditions and design requirements of the pressure vessel. .
In order to make the welds on boilers and pressure vessels evenly distributed and avoid the superposition of welding residual stresses, the number and arrangement of welds are specified in the relevant regulations for boilers and pressure vessels. For example, when splicing cylinders, the length of the shortest cylinder section: For medium and low pressure boilers, it should not be less than 300mm, and for high pressure boilers, it should not be less than 600mm. Number of longitudinal welds per section of cylinder: When the inner diameter of the cylinder is 1800mm, there should be no more than 3 splicing welds. The longitudinal welds of adjacent cylinder sections should be staggered from each other, and the length of the outer arc between the center lines of the two welds should not be less than 3 times the thickness of the steel plate, and should not be less than 100mm
Excerpted from: GB/T 150.4-2011
150, 2024 version regulations