How much settlement of the oil storage tank foundation is required before the tank can no longer be used?
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The foundation of the oil tanks in our company has sunk, and the bottom plates of the tanks have suffered significant deformation. I would like to ask everyone: at what extent of butterfly-shaped settlement can oil tanks no longer be used?
Half of them are unusable if it exceeds 5 millimeters; those with a downward displacement of more than 5-10 millimeters are also unusable.
SH3068-1995 Code for Design of Foundations of Steel Storage Tanks in Petrochemical Enterprises: Allowable Values for Foundation Deformation, Characteristics of Tank Foundation Deformation, Types of Tanks, Inner Diameter of Tank Bottom Ring in meters, Allowable Value for Settlement Difference in millimeters, Planar Tilting (in any diameter direction). For floating roof tanks and internal floating roof tanks: Dt≤22, 22＜Dt≤30, 30＜Dt≤40, 40＜Dt≤60; values are 0.007Dt, 0.006Dt, 0.005Dt, 0.004Dt respectively. For fixed roof tanks: Dt≤22, 22＜Dt≤30, 30＜Dt≤40, 40＜Dt≤60; values are 0.015Dt, 0.010Dt, 0.009Dt, 0.008Dt respectively. For non-planar tilting (uneven settlement around the tank): For floating roof tanks and internal floating roof tanks, △S/l≤0.0025; for fixed roof tanks, △S/l≤0.0040. The slope of the tank foundation cone should be ≥0.008. Note: △S represents the settlement difference between adjacent measurement points around the tank； l is the distance between adjacent measurement points around the tank (mm). This post was last edited by lhy on 2009-3-11 12:11]
As long as there is uniform settlement, there is no need to worry. Floating roof tanks are feasible based on the data provided by the original poster, and for dome roof tanks, as long as the inclination due to non-uniform settlement does not exceed 15°, there will be no problems.
The person upstairs is an expert; the answer to this question was absolutely brilliant.