What has been the common design for the central drainage systems in large crude oil storage tanks over the past 5 years?

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This post was last edited by rechuli on 2025-10-11 at 17:38. Dear experts, as the title suggests, in recent years, what types of central drainage systems are used in the design of crude oil storage tanks with a capacity of over 50,000 cubic meters? (Online, the main types mentioned are the split-track type and the fully flexible type; among the fully flexible types, there are both imported and domestically produced versions.) What are the differences between these systems in terms of tank design? Is there a significant difference in terms of investment costs? According to the new SY5921 standards, the first inspection period for newly built tanks can be scheduled after 15 years of use. Given such a long service life, which type of drainage system is more reliable? Also, when making the selection, is the frequency of lifting and lowering the floating platform taken into account (that is, how many times it is lifted and lowered per year, etc.)? Thank you all; I hope the experts can give me some advice!