TH43607A - A method for removing compressed liquid gas from a storage device. - Google Patents

Abstract

DC60 (24/01/43) A method is disclosed for the removal of compressed liquid gas from a series of containers containing a liquid gas at a temperature exceeding -112 °C. The compressed replacement fluid is introduced into a series of containers to release the compressed liquid gas. The replacement fluid is then pumped from the series container to a series of containers to release the liquid gas. As the replacement fluid is separated from the series container, the void created by the separation is filled with vapor at a pressure lower than the pressure of the replacement fluid. The fluid connection between the series of containers is subsequently cut, and the initial steps are repeated for all containers in sequence, except that the last container in the series of replacement fluid is pumped to an auxiliary container for storage rather than to another container. A method is disclosed for the removal of compressed liquid gas from a series of containers containing a liquid gas at a temperature exceeding -112 °C. The compressed replacement fluid is introduced into a series of containers. To release the compressed liquid gas, the replacement fluid is pumped from the first-stage packing device to the second-stage packing device of a series of packing devices. As the replacement fluid is separated from the first-stage packing device, the void created by the separation of the replacement fluid is filled with vapor at a pressure lower than the pressure of the replacement fluid. The fluid connection between the first-stage second-stage packing devices is then cut, and the initial step is repeated for all packing devices in sequence, except that in the last packing device in the series, the replacement fluid is pumped to an auxiliary packing device rather than to another packing device.

Claims (12)

1. A method for replacing a number of packing devices containing high-methane liquefied gas and residual gas, such liquefied gas having a temperature above -112 °C (-170 °F) and the necessary pressure at the liquefied gas bubbling point, which consists of the following steps: (a) introducing the pressurized replacement fluid into the aforementioned packing devices to release the pressurized replacement fluid and residual gas, the replacement fluid having a pressure higher than the pressure of the liquefied gas; (b) pumping the replacement fluid from the first packing device to the second packing device of the number of packing devices to release the liquefied gas and filling the void in the first packing device by separating the replacement fluid from the vapor at a pressure lower than the pressure of the replacement fluid in the second packing device; and (c) separating the fluid connection between the first and second packing devices and repeating steps (a) and (b) for all such packing devices, respectively, until all packing devices are free of liquefied gas. And fill with low-pressure vapor, unless the final liquid filling device for replacement is pumped out to the auxiliary filling device. 2. The method of claim 1, by the liquid temperature for displacement, is higher than -112°C. 3. The method of claim number 1 by means of a liquid for replacement, which refers to ethanol. 4. Method of Claim 1 by liquid for replacement, meaning n-propyl alcohol. 5. The method of claim I, by means of a liquid substitute, refers to tetrahydrofurap. 6. The method of claim 1 by which the gas of step (b) is obtained from liquefied gas. 7. Method of Claim 1 by meaning vapor pressure is less than 200 psi (1380 kilopascals). 8. The method of claim 1, where the liquid temperature for displacement is approximately equal to the temperature of the liquefied gas in the first-order filling device. 9. The method of claim 1, subsequently incorporated, involves recycling the replacement fluid that is pumped to the auxiliary tank in step (c) to provide at least some of the fluid in step (a). 10. The method of claim 1, subsequently, comprises the following steps: the passage of the liquefied gas, released and residual gas of phase (a) into a phase separator which produces a vapor phase and at least one liquid phase; the removal of the vapor from the separator; the expansion of the vapor to reduce its pressure; the passage of the expanded vapor to a first-order dispensing device as low-pressure vapor of phase (b); and its removal from the separator for controlled flow of high volume liquefied gas. 11. The method of claim number 10 is subsequently incorporated with the removal from the separation device by a fluid stream containing a high volume of displaced fluid. 12. The method of claim 11 is subsequently incorporated into the liquid recycling procedure, in which a high volume of replacement liquid is removed from the separator by supplying at least one sub-concentration of replacement liquid in step (a) of claim 1.