In normal conditions, there will always be settlement. If there is no settlement expected (for example, a tank over a giant rock), it might not need settlement measurements, but that´s a decision that is entirely up to the owner. In new tanks, the API 650 standard doesn´t necessarily asks for a settlement measurement to be done during hydrostatic tests. And as complex as it may look in the api 653 standard, the limitations imposed by the BOK make it a really easy topic. As an inspector, you should be able to determine the type and extent of tank settlement, and decide if it can affect tank integrity. In the api 653 exam, maybe 2 questions will show up about this subject. In fact, the word “settlement” is mentioned more than 250 times in the API 653 standard. It is a very important subject for us tank inspectors, althought is also one of the most vague topics for a new inspector. Tank settlement is one of the topics of the Body Of Knowledge for the API 653 exam.
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