Let’s discuss together the differences between the \"Steaming Regulations\" and the \"Tolerance Regulations\" in terms of welding (a reward of 3 charm points for interesting discussions—Benny Spin)
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This post was last edited by Benbenxuan on 2011-7-14 21:39. There are significant differences between steam standards and pressure vessel standards in terms of welding, such as assembly accuracy, welding quality, flaw detection, test plates, etc. Please discuss this and draw out some conclusions.
I’m just wondering, what is “Steaming Rules”? I’ve never really heard of it! I’m sorry, but my knowledge is limited!
This issue is quite complex; let me mention a few points. 1. Welding method for small nozzles: The regulations do not specify explicitly which welding method should be used, but in boilers, the placement welding method is commonly employed for small nozzles, whereas in pressure vessels, the insertion welding method is traditionally used ； 2. Inspection ratio for welds: 20%, 50%, and 100% as specified in the tolerance standards ； While the steam standards require 10%, 25%, and 100%
I would also like to mention two points: 1. There is no clear specification in the boiler standards regarding the designation of longitudinal and circumferential seams as Seam A and Seam B; whereas in GB150, there are diagrams for containers； 2. The regulations regarding the amount of misalignment of welds differ between pot standards and container standards ； 3. Depending on the number of test plates, in addition to longitudinal seam test plates, the drum also requires circumferential seam test plates ； When the butt welds of the boiler header and pipes are made of alloy steel, simulation test pieces must also be prepared for each batch ； 4. The standards used for weld evaluation differ; one is an appendix to the steam regulations, while for containers it is JB4708 ；