Post-weld heat treatment of the pressure vessel shell reinforcement ring
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There is a reactor with a diameter of 8m, and the reactor shell has a reinforcement ring. The drawings specify that the weld joints between the stiffening ring and the shell shall undergo post-weld stress relief heat treatment. Currently, this ring of joints is to be annealed in eight segments. I would like to ask: does this ring of joints fall under segmented heat treatment or local heat treatment? In the case of segmented heat treatment, both GB150 and GB30583 stipulate that there must be a reheating section of 1.5 meters. Should this requirement be followed? In the case of local heat treatment, I see that the specification sets requirements for the width of the heat-treated area. Are there any requirements regarding its length as well, or is it sufficient to heat-treat the entire area?
According to our company’s process, for the heat treatment of a circle, it is equivalent to treating a circumferential weld. How can it be divided into segments like this? Naturally, the entire circle should be heat-treated at the same time.
Is the OP trying to say that the diameter is too large and it won’t fit? Though it does sound a bit inappropriate :)
Segmented heat treatment is used when the equipment is too large to be put into the furnace all at once; this shouldn’t fall under that category, right?