Is it possible to increase the diameter of the tube holes in the heat exchanger tube sheet?
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For heat exchangers, the standard diameter for the tube sheet holes is 38.45 mm; I increased it to 38.8 mm. Will strengthening the welds and using expansion joints work?
What I’m looking at is clause 6.5.1.7. What it states is that the \"maximum gap\" cannot exceed the requirements for Class II tube bundles; for Class II tube bundles, the negative deviation of the steel tubes is 0.2 mm, while the positive deviation of the holes in the tube sheet is 0.1 mm. In other words, the minimum diameter of the steel tubes is 37.8 mm, and the maximum diameter of the holes is 38.6 mm, so the gap between them is 0.8 mm. This means that with a strength weld and appropriate expansion, the maximum gap between the diameter of the steel tubes and that of the tube sheet can be within 0.8 mm, right?
A key point is that clause 6.5.1.7 emphasizes the “maximum gap””
Look closely: it’s either strength swelling under conditional conditions, or strength swelling combined with adhesive swelling; there are no issues such as welding stress concentration from a welding machine. Your requirement is for strength welding, but that introduces welding-related problems.
What do \"intensity swelling + adhesive swelling\" mean? I thought it was a printing error; I’ve only heard of \"intensity welding + adhesive swelling\"