Failures of most concern are: (1) Distortion of shell such that the floating roof malfunctions and (2) rupture of the shell or bottom plate or shell bottom plate connection. The tilt will cause an increase in the liquid level and, therefore, an increase in the hoop stress in the tank shell. This component rotates the tank in a tilted plane. Rigid body tilting of a tank (planar tilt). Uniform settlement does not induce stresses in the tank structure. However, attention should be paid to pipe connections and other attachments. ![]() This component often can be predicted in advance, with sufficient accuracy, from soil tests. API 653 talks about three types: uniform, planar tilt and out-of-plane settlement. Settlement in tanks can be of several types. The following is an introduction to the subject of settlement. If you are an API 653 inspector, there are many opportunities to do inspection or consulting jobs in small tanks. ![]() I got by only whith was needed for the exam. Tank settlement was, for a long time, elusive to me.
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