A spherical gas-storage tank with an inside diameter of 7.3m is being constructed to store gas under an internal pressure of 1.23MPa. The tank will be constructed from steel that has a yield strength of 285MPa. If a factor of safety of 2.7 with respect to the yield strength required, determine the minimum wall thickness tmin required for the spherical tank. Answer in mm, rounded-off to two decimal places.

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.