Method and apparatus for providing over-pressure protection for an underground storage cavern
AssigneeAir Liquide Large Industries U.S. LP
InventorPhillip James
Life of this patent
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Abstract
A method and apparatus is provided which will provide over-pressure protection for an underground storage cavern by reducing the pressure of a pressurized gas stream originating from the an underground storage cavern to form a lower pressure gas stream, monitoring the pressure of a lower pressure gas stream and stopping the flow of the lower pressure gas stream to the pipeline should the pressure of the lower pressure gas stream exceed a threshold value.
Claims13
A method for providing over-pressure protection for an underground storage cavern and a pipeline in fluid communication with the underground storage cavern, wherein the underground storage cavern is a salt cavern, the method comprising the steps of:
- providing an over-pressurization system comprising a pressure monitor, an isolation valve, and a pressure relief valve, wherein the isolation valve is fluidly connected between underground storage and the pipeline, wherein the pressure relief valve is fluidly connected between the underground storage and the pipeline, wherein the pressure relief valve is downstream of the isolation valve;
- receiving a pressurized gas from the underground storage cavern, wherein the pressurized gas is at a pressure exceeding the pressure within the pipeline;
- flowing the pressurized gas through a pressure reducing device configured to reduce the pressure of the pressurized gas received from the underground storage cavern;
- monitoring the pressure of the pressurized gas downstream of the pressure reducing device using the pressure monitor;
- introducing the pressurized gas to the pipeline if the pressure of the pressurized gas downstream of the pressure reducing device is below a first threshold value;
- and
- closing the isolation valve upstream of the pressure relief valve if the pressure of the pressurized gas downstream of the pressure reducing device is at or exceeds the first threshold value, such that the flow of the pressurized gas to the pipeline and the pressure relief valve is stopped.
A method for providing over-pressure protection for an underground storage cavern and a pipeline fluidly connected to the underground storage cavern, wherein the underground storage cavern is a salt cavern, the method comprising the steps of:
- providing an over-pressurization system comprising a pressure monitor, an isolation valve, and a pressure relief valve, wherein the isolation valve is fluidly connected between underground storage and the pipeline, wherein the pressure relief valve is fluidly connected between the underground storage and the pipeline, wherein the pressure relief valve is downstream of the isolation valve;
- receiving a pressurized gas from the underground storage cavern, wherein the pressurized gas is at a pressure exceeding the pressure within the pipeline;
- flowing the pressurized gas through a pressure reducing device configured to reduce the pressure of the pressurized gas received from the underground storage cavern;
- monitoring the pressure of the pressurized gas downstream of the pressure reducing device using the pressure monitor;
- determining whether the pressure reducing device has suffered a failure;
- in the event of determination of a failure of the pressure reducing device, closing the isolation valve upstream of the pressure relief valve thereby preventing flow of the pressurized gas to the pipeline and the pressure relief valve;
- and
- in the event of determination of a non-failure of the pressure reducing device, introducing the pressurized gas to the pipeline.
Dependencies are inferred from the claim text.