Selection issues for manholes in containers made of 316L material at a working temperature of 400 degrees
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1. In GB150-2011 and HG/T20592-2009, the maximum operating temperature for 316L is 450 degrees. Why is the maximum operating temperature for manholes made of 316L in standards such as HG/T 21517-2014 only 300 degrees? 2. How should manholes be designed for 316L vessels with an operating temperature of 400 degrees and a design temperature of 450 degrees?
If a different material is used, GB 150 standards can be met; as long as the calculations show it is acceptable, then that material can be used. For example, S310 and 347 are preferably the same as the cylinder material
Micro-positive pressure equipment can use 316L
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In fact, as long as one does not choose a standard manhole, I can provide my own drawings for the manhole components; the flanges, flange covers, studs, nuts, and gaskets selected in accordance with HG/T20592-20613 are all the same as those specified in HG/T 21517-2014, so they meet the standards as well, and no calculations are required. I just don’t understand why the upper temperature limit specified in both GB150-2011 and HG/T20592-2009 is 450 degrees; yet in standards such as HG/T 21517-2014 for manholes, the upper temperature limit for manholes made of 316L material is only 300 degrees.
Is it because the calculation method is different? Generally, when the temperature limits for the same material vary, the calculation methods for the two cases differ, including the choice of coefficients used