Diverter systems are designed to handle shallow gas flows and gas hydrate dissociation, but the design requirements differ substantially due to the nature of the hazard. Shallow gas flows typically occur at relatively shallow depths where the gas is free and can flow quickly to the surface. A diverter system for shallow gas is designed to quickly and safely redirect the flow of gas away from the rig floor to prevent explosions and fires. These systems typically consist of a rotating diverter head located below the rotary table, a vent line to carry the gas away from the rig, and a means of sealing the annulus (the sp....
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