I have a graduation defense today, and there are a few questions I’d like to ask everyone
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1. What is the purpose of thinning long-neck butt weld flanges? I answered that it is to prevent structural mutations and to avoid the generation of local stresses. It was asked again: What type of local stress was generated? ? 2. The corrosion margin for my tube bank is set to 0, because I believe the heat exchange tubes I used are of 19 by 2 dimensions; if the corrosion margin were set to 1 or 2, wouldn’t the effective thickness be reduced to nothing? ! The teacher said that using a corrosion margin of 2 is sufficient to meet the strength requirements. Why?
The first issue is due to roughly this reason; the answer to the second issue is incorrect. The standards for heat exchange tubes stipulate that no corrosion margin needs to be considered, but corrosion margins still need to be taken into account for the tube side, as well as the shell head, cylinder, and tube sheet.
May I ask which standard specifies that no corrosion margin is considered for heat exchange tubes?