Tube sheet calculation
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For a DN850 heat exchanger, there were originally 221 tubes; 20 mm was the specified diameter for these tubes. Ten tubes were removed during the process, and for simplicity, the value of 221 was changed to 211 in the calculation sheet without conducting any further calculations. The last time I checked GB/T151, I found that when k>1, it’s not possible to use GB/T151 for calculations in SW6 when k>1; using JB/T4732 instead also yields valid results, but the calculation report still has to be prepared in accordance with GB/T151 standards. The inspection is coming up soon, and I’d like to ask everyone what to do Should we change the calculation sheet? During inspection, does the inspector only look at the calculation sheet or do they calculate it using SW6 themselves? I’ve only been working for a short time; before this I was involved in work related to normal pressure and negative pressure. It’s really complicated working with pressure vessels for the first time
…… Well, I sent the post again exactly as it was… I give up
Reducing the number of tubes allows for an increase in the center distance or local reduction from the inside; this does not necessarily affect the k value.
With the reduction in tubes, the support provided by the heat exchange tubes to the tube sheet decreases, and the tube sheet may thicken. It has already been manufactured; the tube spacing cannot be changed. Since local (component) parts can be designed through analytical methods without requiring any special qualifications, the tube sheet can be calculated according to JB4732, along with an additional calculation report. However, GB/T151 tube sheets are designed through analysis methods, and the allowable stress (stress intensity) here should use the values specified in GB/T150; I’m concerned that you won’t be able to pass the calculations. Pressure vessels must be checked in every detail; it’s not done just for inspection purposes. When an incident occurs on site, the design is the first thing to be examined.
Agree with what was said on floor 4; first of all, you need to ensure that there are no issues with your design