Issues with pipe fixing brackets for ammonia synthesis compressors
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The pipe fixing brackets for ammonia synthesis gas compressors are welded directly to the pipes. Are there any disadvantages to this design and construction method? Discussions are welcome.
The design and construction method of directly welding the fixing bracket to the pipeline may have the following disadvantages: 1. Stress concentration: Welding points can create areas of stress concentration, which reduces the fatigue strength of the pipeline material in those areas, thereby affecting the overall stability and safety of the pipeline. 2. Heat-affected zone: The high temperatures generated during welding cause changes in the microstructure of the pipe material, resulting in a heat-affected zone that may reduce the mechanical properties of that area. 3. Difficult maintenance: Once the welded area is damaged or needs to be replaced, the overall maintenance process becomes complex, increasing both costs and time required for maintenance. 4. Leakage risk: If the welding quality does not meet standards, welding defects such as cracks and pores may occur, which can easily lead to leakage accidents. Therefore, it is recommended to consider using bolted connections or other detachable connection methods during design, to facilitate future maintenance and repair. .
If problems are found on site, the construction design drawings can be checked. The drawing number of the standard support and hanger used. Both the Ministry of Chemical Industry and the design institutes have standard drawings for supports and hangers.
Figure 1 shows the vertical trunnion of a elbow, while Figure 2 shows the vertical trunnion of a horizontal pipe. The main issue is to determine whether reinforcement is needed at the welding site.
Compare it with the **standard specifications**. Can the two match up?
The chemical industry standard HG/T 21629-2021, \"Standard Drawings for Pipe Racks,\" does indeed include this type of fixed pipe rack in which the trunnion base is welded in place. In practical use, it depends on whether there is vibration in the pipeline; if there is no vibration, and the calculated thrust meets the requirements, then there should be no problem.