![]() ![]() The hoop stress is then compared to the yield strength of the material. In an allowable stress approach the hoop stress in the shell is calculated using the shell width less the sum of the bolt holes. When the bolts are taken into account, the difference becomes greater. In traditional tank design, the maximum allowable stress is 66% of yield (F y/1.5). Using a material factor of φ=0.9, the hydrostatic load is permitted to generate stresses in the shell up to 75% of yield (0.9*F y/1.2). In general, limit states and allowable stress design produce relatively similar results however, the material savings afforded by the design of a bolted steel tank to AS2304 using a limit states approach are significant.įirstly, the hydrostatic load is considered a liquid pressure action and acquires a factor of 1.2 for the calculation of design stresses. The design of bolted steel tanks to AS2304 is based on a limit states approach which represents a fundamental change in philosophy with respect to traditional tank design. ![]()
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