A very simple app to check / design a steel tank shell in accordance with API 650 2013. Design results include
-minimum required shell thickness per strake
-Ring wall moment, etc..
*internet permission required for ads
一个非常简单的应用程序来检查/设计出钢槽壳符合API 650 2013。设计成果包括
最小每边条要求的外壳厚度
环墙的时刻，等等。
*所需广告网络的权限

-fix for summary print out error (free version only), where weight of roof/platform is reported as 1000x of input. Thanks to user feedback.
Added in app purchase for removing Ads, support for SI and Imperial units, designing the bottom annulus as maybe required, save and restore input, and export design result as text file.
updated to API650 12th edition (2013)