Abstract: A method of pad gas management in an underground storage volume including storing a first compressible fluid, determining a transient minimum operating pressure (Ptrans), measuring the pressure (Pact), removing at least a portion of the first compressible fluid, concurrently, introducing an incompressible fluid, thereby producing a transient pressure condition controlled by the flow rate of the incompressible fluid, such that Ptrans<Pact. The method may also include a length of casing, permanently cemented into the surrounding rock formations, with a final cemented casing shoe defining the practical endpoint at an approximate depth (Dcasing), determining a transient pressure gradient (Gtrans) for the underground storage volume, wherein Ptrans<Dcasing×Gtrans. The maximum removal of the first compressible fluid is controlled such that Pmin<Pact, and wherein the transient pressure condition has a duration (D) of less than 7 days, more preferably less than 5 days.

Abstract: An inventory management method is provided, which includes filling a first salt cavern with a product gas, removing all the working gas from a second salt cavern when the frequency requirement to empty the second salt cavern is reached, while concurrently, removing and replacing the gas product from the first salt cavern as supply and demand dictate, analyzing the frequency requirement for emptying the first salt cavern, calculating the time to fill the second salt cavern, filling the second salt cavern with a product gas, removing all the working gas from the first salt cavern when the frequency requirement to empty the first salt cavern is reached, while concurrently, removing and replacing the gas product from the second salt cavern as supply and demand dictate, analyzing the frequency requirement for emptying the second salt cavern, calculating the time to fill the first salt cavern, and repeating steps b)-j).

Abstract: A cavern pressure control method includes storing compressible and possibly incompressible fluids in an underground storage volume, removing a portion or introducing additional incompressible fluid into the underground storage volume, possibly removing a portion or introducing additional compressible fluid into the underground storage volume, thereby producing a net pressure increase rate (Pinc) within the underground storage volume, wherein Pinc is maintained at less than a predetermined maximum increase value (PImax).

Abstract: A cavern pressure control method includes storing compressible and possibly incompressible fluids in an underground storage volume, removing a portion or introducing additional incompressible fluid into the underground storage volume, possibly removing a portion or introducing additional compressible fluid into the underground storage volume, thereby producing a net pressure increase rate (Pinc) within the underground storage volume, wherein Pinc is maintained at less than a predetermined maximum increase value (PImax).

Abstract: A cavern pressure control method includes storing compressible and possibly incompressible fluids in an underground storage volume, removing a portion or introducing additional incompressible fluid into the underground storage volume, possibly removing a portion or introducing additional compressible fluid into the underground storage volume, thereby producing a net pressure increase rate (Pinc) within the underground storage volume, wherein Pinc is maintained at less than a predetermined maximum increase value (PImax).

Abstract: A cavern pressure control method includes storing compressible and possibly incompressible fluids in an underground storage volume, removing a portion or introducing additional incompressible fluid into the underground storage volume, possibly removing a portion or introducing additional compressible fluid into the underground storage volume, thereby producing a net pressure decrease rate (Pdec) within the underground storage volume, wherein Pdec is maintained at less than a predetermined maximum decrease value (PDmax).

Abstract: A cavern pressure control method includes storing compressible and possibly incompressible fluids in an underground storage volume, removing a portion or introducing additional incompressible fluid into the underground storage volume, possibly removing a portion or introducing additional compressible fluid into the underground storage volume, thereby producing a net pressure decrease rate (Pdec) within the underground storage volume, wherein Pdec is maintained at less than a predetermined maximum decrease value (PDmax).

Abstract: An inventory management method is also provided. This method includes removing and replacing the gas product from a first salt cavern as supply and demand dictate, analyzing the impurities in the gas product that is removed, predicting the duration until a maximum acceptable impurity limit is present, removing all the working gas from the first salt cavern when the maximum acceptable impurity limit is reached, then replacing the working gas in the first salt cavern, while concurrently, removing and replacing the gas product from a second salt cavern as supply and demand dictate, analyzing the impurities in the gas product that is removed, predicting the duration until a maximum acceptable impurity limit is present, removing all the working gas from the second salt cavern when the maximum acceptable impurity limit is reached, then replacing the working gas in the second salt cavern, while concurrently repeating steps a)-g).

Abstract: A carbon steel for use in high pressure hydrogen service is provided. This steel may have greater than 1.20% manganese and greater than 0.035% sulfur. This steel may have no more than 0.16% carbon, no more than 1.10% manganese, no more than 0.010% phosphorus, no more than 0.05% sulfur, no more than 0.02% silicon, no more than 0.15% copper, no more than 0.10% nickel, no more than 0.1% chromium, no more than 0.03% molybdnium, no more than 0.40% aluminum, no more than 0.02% vanadium, no more than 0.0005% boron, no more than 0.003% titanium, and no more than 0.02% niobium.

Abstract: An inventory management method is also provided. This method includes removing and replacing the gas product from a first salt cavern as supply and demand dictate, analyzing the impurities in the gas product that is removed, predicting the duration until a maximum acceptable impurity limit is present, removing all the working gas from the first salt cavern when the maximum acceptable impurity limit is reached, then replacing the working gas in the first salt cavern, while concurrently, removing and replacing the gas product from a second salt cavern as supply and demand dictate, analyzing the impurities in the gas product that is removed, predicting the duration until a maximum acceptable impurity limit is present, removing all the working gas from the second salt cavern when the maximum acceptable impurity limit is reached, then replacing the working gas in the second salt cavern, while concurrently repeating steps a)-g).

Abstract: This method includes a solution mined underground salt cavern, wherein the salt cavern has a main body with a mean diameter of DN, and an upper portion comprising an inert gas pad, a stream of leaching water which is injected below the inert gas pad with a velocity V, thereby leaching an Nth tier adjacent to the upper portion having a height H1 and a mean diameter DN+1 that is smaller than DN by a ratio R raising the inert gas pad by an amount A1, providing a stream of leaching water which is injected below the inert gas pad with a velocity V, thereby leaching a N+1th tier adjacent to the Nth tier having a height H2 and a to a mean diameter DN+2 that is smaller than DN+1 by a ratio R, and repeating steps c and d a number of times T, thereby forming a stable roof.

Abstract: This method includes a solution mined underground salt cavern, wherein the salt cavern has a main body with a mean diameter of DN, and an upper portion comprising an inert gas pad, a stream of leaching water which is injected below the inert gas pad with a velocity V, thereby leaching an Nth tier adjacent to the upper portion having a height H1 and a mean diameter DN+1 that is smaller than DN by a ratio R raising the inert gas pad by an amount A1, providing a stream of leaching water which is injected below the inert gas pad with a velocity V, thereby leaching a N+1th tier adjacent to the Nth tier having a height H2 and a to a mean diameter DN+2 that is smaller than DN+1 by a ratio R, and repeating steps c and d a number of times T, thereby forming a stable roof.

Abstract: A carbon steel for use in high pressure hydrogen service is provided. This steel may have greater than 1.20% manganese and greater than 0.035% sulfur. This steel may have no more than 0.16% carbon, no more than 1.10% manganese, no more than 0.010% phosphorus, no more than 0.05% sulfur, no more than 0.02% silicon, no more than 0.15% copper, no more than 0.10% nickel, no more than 0.1% chromium, no more than 0.03% molybdnium, no more than 0.40% aluminum, no more than 0.02% vanadium, no more than 0.0005% boron, no more than 0.003% titanium, and no more than 0.02% niobium.

Abstract: A carbon steel for use in high pressure hydrogen service is provided. This steel may have greater than 1.20% manganese and greater than 0.035% sulfur. This steel may have no more than 0.16% carbon, no more than 1.10% manganese, no more than 0.010% phosphorus, no more than 0.05% sulfur, no more than 0.02% silicon, no more than 0.15% copper, no more than 0.10% nickel, no more than 0.1% chromium, no more than 0.03% molybdnium, no more than 0.40% aluminum, no more than 0.02% vanadium, no more than 0.0005% boron, no more than 0.003% titanium, and no more than 0.02% niobium.

Abstract: A carbon steel for use in high pressure hydrogen service is provided. This steel may have greater than 1.20% manganese and greater than 0.035% sulfur. This steel may have no more than 0.16% carbon, no more than 1.10% manganese, no more than 0.010% phosphorus, no more than 0.05% sulfur, no more than 0.02% silicon, no more than 0.15% copper, no more than 0.10% nickel, no more than 0.1% chromium, no more than 0.03% molybdnium, no more than 0.40% aluminum, no more than 0.02% vanadium, no more than 0.0005% boron, no more than 0.003% titanium, and no more than 0.02% niobium.

Abstract: A hydrogen pipeline detonation arrestor is provided. The detonation arrestor includes a pipeline spool, having a segment length, an inner volume, an outer surface. The detonation arrester also includes a detonation barrier having a plurality of axially aligned quench pipes located within the inner volume. The detonation arrester is located within a hydrogen pipeline upstream or downstream of a hydrogen salt cavern storage facility.

Abstract: This method includes providing an cased borehole located within a salt bed, injecting an aqueous liquid into the cased borehole at a first pressure, in order to expose the salt bed to the aqueous liquid, thereby dissolving at least a portion of the salt bed and forming a brine solution within an underground storage volume, withdrawing at least a portion of the brine solution from the underground storage volume, and injecting an inert gas into the cased borehole at a second pressure, in order to provide an inert blanket within the underground storage volume, wherein the second pressure that is greater than the first pressure but less than the maximum allowable pressure of the cavern.

Abstract: This method includes providing an cased borehole located within a salt bed, injecting an aqueous liquid into the cased borehole at a first pressure, in order to expose the salt bed to the aqueous liquid, thereby dissolving at least a portion of the salt bed and forming a brine solution within an underground storage volume, withdrawing at least a portion of the brine solution from the underground storage volume, and injecting an inert gas into the cased borehole at a second pressure, in order to provide an inert blanket within the underground storage volume, wherein the second pressure is greater than the first pressure but less than the maximum allowable pressure of the cavern.

Abstract: A hydrogen pipeline detonation arrestor is provided. The detonation arrestor includes a pipeline spool, having a segment length, an inner volume, an outer surface. The detonation arrester also includes a detonation barrier having a plurality of axially aligned quench pipes located within the inner volume. The detonation arrester is located within a hydrogen pipeline upstream or downstream of a hydrogen salt cavern storage facility.

Abstract: A carbon steel for use in high pressure hydrogen service is provided. This steel may have greater than 1.20% manganese and greater than 0.035% sulfur. This steel may have no more than 0.16% carbon, no more than 1.10% manganese, no more than 0.010% phosphorus, no more than 0.05% sulfur, no more than 0.02% silicon, no more than 0.15% copper, no more than 0.10% nickel, no more than 0.1% chromium, no more than 0.03% molybdnium, no more than 0.40% aluminum, no more than 0.02% vanadium, no more than 0.0005% boron, no more than 0.003% titanium, and no more than 0.02% niobium.