Settlement observations are conducted regularly on storage tanks in use; what are the specific methods for such observations?

1. Fixed-point method: Select several fixed points around the storage tank, use instruments such as levels for measurements, compare the elevation values at different times, and determine the settlement changes. 2. Steel gauge method: Steel gauges are buried around the storage tank, and their length changes are measured regularly to determine the degree of settlement. 3. Inclinometer method: An inclinometer is used to measure changes in the inclination angle of the storage tank, and settlement is determined based on these angle changes. 4. Rope hanging method: Wrap a rope around the outer wall of the storage tank, and measure its length regularly to determine the degree of settlement. 5. Simulation calculation method: Based on the structure and material of the storage tank, mathematical models are used for computational analysis to predict settlement patterns. .