Hydrogen Energy Liquefaction and Storage

A: This choice limits flash gas formation and keeps the expansion in the intended regime so exchangers don't see dry-out. Increasing feed flow drives more warm mass into a cold exchanger and worsens temperature rise. Bypassing heat exchange throws away refrigeration and spikes downstream temperatures. Raising discharge pressure increases JT heating for hydrogen above inversion at these conditions.

A: This assumption preserves relief capacity without isolation, matching common cryogenic practice when disks protect PSVs. Treating the disk as legacy risks missing a failure point during cooldown. Assuming a hidden block valve imports non-cryogenic habits and creates isolation risk. A bursting panel is drawn differently and wouldn't route to flare.

A: This load matches 30 kWh/kg × 10,000 kg/day divided by 24 h with margin for losses. Three megawatts ignores the thermodynamic penalty of deep cryogenic work. Thirty megawatts double-counts compression already embedded in the specific figure. Sub‑megawatt assumes ideal cycles that don't exist in hydrogen service.

A: This choice resists hydrogen embrittlement and retains toughness at cryogenic temperature. Carbon steel embrittles and loses ductility even after PWHT. 9% Ni suits LNG temperatures but faces hydrogen compatibility limits under cycling. Aluminum trades weight for permeability and joint sensitivity in hydrogen service.