Regarding the issue of large openings
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On a device with an inner diameter of 1000, a 24\" manhole needs to be installed; its outer diameter at the opening is 610, which exceeds the range applicable for equal-area reinforcement. How should this be calculated? 1. GB150 does not specify that reinforcement can be calculated using the method outlined in HG20584 for large openings. Is it acceptable to use HG20584 for such calculations? 2. I once read an article stating that calculations can be done using analytical design methods, and that reinforcement can be determined even without having the qualifications for analytical design. Is this approach valid? 3. How should this issue be addressed if ASME design codes are followed? Please advise those with expertise
1. Feasible (incidentally, the calculation part is not HG20584; it’s 20584 for manufacturing) ； The calculation is HG20582) ； 99% of organizations across China handle things in this way. 2. It’s not an article; analysis is the standard recommendation. The organization does not need to have analytical qualifications, but the person conducting the analysis must ensure its accuracy. 3. According to ASME standards, calculations can be performed, and there is no issue of exceeding these standards.
It is sufficient to use the pressure-area method recommended by SW6 for the calculations; although this method is not recognized by GB150, it does not affect the safe operation of the equipment at all.