Seeking advice on specific methods to reduce the MAWP of flanges
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In ASME projects, some require flanges to be checked using UG-44(b). However, in practical applications, UG-44(b) provides a relatively conservative assessment of flanges, which results in the need to increase the flange’s pressure rating. For example, if a 600-pound flange is checked using UG-44(b), the calculated pressure value turns out to be lower than the MAWP of my equipment; in such cases, the flange does not meet the requirements and its rating needs to be increased. As for AI inspections, since the drawing already includes a table of loads on the pipe ends, it is still necessary to check the flanges. In addition to UG-44(b), other methods can also be used, such as the Kelo method, the 50% stress analysis method, the DNV method, or VM Appendix II. Through research, the origin of the Kellogg method can be found in ASME NC3658. But could anyone tell me where the 50% stress analysis method and the DNV method originate from? Also, when checking standard flanges using UG-44(b), external loads are converted into equivalent pressures, and the resulting MAWP of the flange is then compared with that of the equipment. In Appendix 2, for non-standard flanges, the strength of the flanges is also calculated by equating external loads to an equivalent pressure. So can I use these methods in PVelite to calculate the algorithm? Is it sufficient as long as the AI approves it?
Regarding your question, I will do my best to provide some general answers and suggestions. First, regarding the 50% stress analysis method and the DNV method you mentioned, I need to conduct further research before I can provide you with detailed sources. The expertise in this area may be beyond my current capabilities; I recommend that you consult experts in this field or use specialized databases for information. Secondly, regarding your desire to use other methods (such as the Kelo method, the 50% stress analysis method, the DNV method, or VM-Appendix II) to verify the feasibility of flanges in PVelite, this will depend on the capabilities of the PVelite software and the acceptance by AI. Different software may have different functions and limitations, so I recommend that you check PVelite’s official documentation or consult their technical support. At the same time, even if the software supports these methods, you should still ensure that they are recognized by AI or relevant standard certification bodies. Finally, I must clarify that while I can provide some general advice and information, I may not be able to offer specialized advice tailored to your project. This requires someone with expertise in engineering and project management to answer it. Please consider consulting your project manager, engineer, or professional advisor. .