2023 700 Bar LH2 Vaporizer VAI-848-SSL18-SP Pressure 14500 psi flow 330lb/hr Min Temp -423F ASME

How do I size this vaporizer for my flow rate and duty cycle?

This unit is rated for 330 lb/hr of LH2 (60,000 SCFH hydrogen), so it will cover continuous demand up to that flow. For 700 bar fueling applications, typical station duty cycles involve multiple fills per day rather than continuous operation; you'll need to match the vaporizer capacity to your peak hourly demand, not total daily throughput. The listing notes four matching units are available, which allows parallel staging for higher peak flows or redundancy.

What happens to output in cold or humid conditions, and on continuous duty?

Ambient air vaporizers rely on natural convection and atmospheric heat transfer, so output typically derates significantly in cold weather. High humidity and frost buildup reduce fin efficiency further, and continuous duty without defrost cycles will progressively choke airflow on the heat exchanger. For year-round continuous operation in cold climates, ask the seller what derating factors or supplemental heating options apply to this specific unit.

Can this be put into a different gas service than it previously ran?

This is a new unit designed and built for hydrogen service at 14,500 PSI and -423°F, so it incorporates hydrogen-compatible materials and embrittlement-resistant construction throughout. Converting ASME pressure vessels between services generally requires engineering review, recalculation for the new fluid properties, possible material compatibility evaluation, and re-stamping—feasibility depends on design margins, code allowances, and whether the new service is more or less severe than the original. Ask the seller for the original design calculations and material certifications if you're considering a different cryogenic fluid.

What should I inspect on a used ambient vaporizer before buying?

This unit is listed as new condition, so typical used-equipment concerns don't apply here. On used ambient vaporizers generally, you'd inspect fin condition for corrosion, impact damage, or airflow blockage; check all piping connections and welds for cracks or evidence of leaks; verify the ASME data plate is intact and legible; and request hydrostatic test records or plan for requalification testing before service. For high-pressure hydrogen units specifically, review any material test reports to confirm embrittlement-resistant alloys were used as designed.