A tooth-lock cover is a kind of convenient closure used in explosive containment vessels. But in experiments, it is found that a small amount of explosive exploded in cylindrical vessels could cause severe deformation to the tooth-lock covers. In some situations, the cover would even be blown out of the vessel with severe distortion. The spreading and superposition of the shock waves in the cylindrical vessel is studied in this paper. Impulse is chosen as the evaluation parameter instead of the peak pressure because of the reflection and superposition of the shock waves. The piston method is used to calculate the impulse and the result is verified in 8-tooth cover vessels. This method can evaluate the intensity of the shock wave loaded on the cover. It would be useful in the optimization of the explosion containment vessels.

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