Differences between the new version of GB50341 and the old version regarding external pressure
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The new version 50341 introduces the calculations for external pressure tanks as specified in Appendix V of API650 with regard to external pressure constraints; the previous 2003 version specified a maximum negative pressure of -0.49 Kpa. So how was this negative pressure value determined in the older version? What impact will the new version have if calculated according to Appendix V? Like wall thickness and such.
-0.49 Kpa – this value is determined based on the negative pressure of the breather valve. Relatively speaking, the number of reinforcing rings in the new standard may be higher than that in the old one, while the wall thickness has little impact.