Over time, hydrogen damages the tank. (Which is undesirable combo with “explosive gas when mixed with air”)
I would like some breakthrough in material sciences here.
> Steel with an ultimate tensile strength of less than 1000 MPa (~145,000 psi) or hardness of less than HRC 32 on the Hardness Rockwell Scale is not generally considered susceptible to hydrogen embrittlement.
https://en.wikipedia.org/wiki/Hydrogen_embrittlement
Gas storage facilities also generally use geological structures which are not susceptible to hydrogen embrittlement either:
https://en.wikipedia.org/wiki/Natural_gas_storage#Types
> Steel with an ultimate tensile strength of less than 1000 MPa (~145,000 psi) or hardness of less than HRC 32 on the Hardness Rockwell Scale is not generally considered susceptible to hydrogen embrittlement.
https://en.wikipedia.org/wiki/Hydrogen_embrittlement
Gas storage facilities also generally use geological structures which are not susceptible to hydrogen embrittlement either:
https://en.wikipedia.org/wiki/Natural_gas_storage#Types