Analysis and design of spherical tanks – hydrostatic test conditions
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Hello everyone: When performing analysis and design for spheres and tanks, if the static pressure of the liquid column exceeds the test pressure by 6%, it is necessary to verify the conditions under which the hydrostatic test will be conducted. Which parts need to be checked in this process? Do structural discontinuity areas need to be checked? Such as the root of the takeover, the position of point a, etc. Thank you!
Check these key areas: the shell body (especially the bottom, where the liquid column pressure is highest), all welds； Pillars and joints, tie rods ； All connections (feed inlets, level gauge ports, etc.) as well as the root and reinforcement parts ； Manholes, internal fittings – these are the pressure-bearing components. In areas where the structure is discontinuous, it is necessary to conduct checks – such as at the root of the pipe fittings, point A, the junctions between supports and the shell, and where shells of different thicknesses meet. Stress concentration is high in these locations; therefore, careful analysis and design are required to ensure that the stress levels are within acceptable limits.
It’s also worth paying attention to the level of settlement of the foundation, for reference.
First, thank you for the answer. According to the new standard GB/T4732, regarding the hydrostatic testing conditions, only S1 and S3 are checked; secondary stresses are not taken into account, nor is there any design for a dynamic load factor or similar! It is different from the old standard. Let’s keep discussing