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A method of determining a required inspection interval for large storage tanks - with design modicfication, risk based inspection (RBI) and utilizing finite element analysis (FEA) - with particular attention for the weld between the bottom annular plates and shell wall.
One of the most critical welds in the design of a large storage tank is the weld between the bottom annular plates and shell wall. The change in direction introduces a biaxial stress, and possible stress concentration. This paper evaluates a method of determining a required inspection interval based on using a combination of conservative design modifications, risk based inspection (RBI) assessments, on site construction verification, and FEA analyses. In the case study presented, a design modification was made to specify this traditionally dual fillet weld as a full-penetration fillet weld. While this exceeds the typical design requirements, exceeding the minimum requirements, inspection codes do not provide acceptance criteria for the design. A more thorough volumetric inspection was conducted, in addition to the typical magnetic particle inspection, to confirm the full penetration of the weld was achieved. In making conservative changes to the design, more robust inspections, and performing RBI methodology, a longer inspection interval can be determined due to the increased information available on the outset. These small changes at the start of the construction can lead to increased operating time without an intrusive inspection through the lifespan of the tank.
Key words: RBI, FEA, ammonia storage tank, inspection interval, commissioning inspection, commissioning verification
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Risk management and a systematic approach of risk based inspection (RBI) based on API 580. The process, benefits, possible pitfalls and opportunity for improvements are clearly detailed based on practical application of RBI and corrosion management of oil and gas facilities.