re: TPC Plant in Port Neches Explosion: Port Neches, Groves, and parts of Nederland Evacuated

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No doubt the spheres can be high pressure....they surely must have a plan to evacuate/off load the material in the spheres when a situation like this occurs?

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Spheres will have relief valves set to depressure the contents either to the atmosphere or a flare based on the maximum design pressure of the sphere. The rate that the relief valves depressure are designed based on the worst case scenario, such as a fire or operational upset. If designed properly, the contents should be relieved. However, the discharge piping may be damaged due to the scale of the fire or the contents could immediately ignite while being discharged.