The origin of the question regarding the equatorial zone of spherical tanks
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This post was last edited by jacques0920 on 2015-8-12 08:10. Hello everyone, as the title suggests, does this question come from the professional exam in 2014? I remember there was a discussion on the forum back then, but I can’t find it anymore. Could you share a link to that discussion post? Thank you
HG20570.2: I think for this question, one needs to understand what the equator is, as well as know the formula for calculating the surface area of a sphere. It’s actually very simple, but during the exam you might not understand what the questions are asking at all~
Analysis of Question 21 under the 2014 Professional Case http://bbs.hcbbs.com/thread-1385070-1-1.html (Source: Haichuan Chemical Industry Forum)
What does the equatorial zone mean? Is it the central line?
This question tests the regulations regarding the calculation of the wetted area in the safety relief section; having the relevant regulations or the Petrochemical Design Manual (4) is sufficient to solve it!
Detailed explanations can be found in the last paragraph of the original source API521 P36.
It is included in the Chemical Process Design Manual (4th Edition)