23,000 SCFH 275 PSI Cryogenic Vaporizer

Is this sized for my peak demand or my average?

Ambient vaporizers are typically sized to meet peak flow demand, not average usage, because they cannot store thermal energy and must deliver the rated capacity instantaneously. This unit is rated at 23,000 SCFH at 275 PSIG. Confirm your peak simultaneous demand including safety margin, and verify whether the rating assumes specific ambient conditions that differ from your site.

What gases can it be put into service with, given what it ran before?

This unit previously ran hydrogen service. Hydrogen is compatible with most industrial and specialty gases from a materials perspective, but any change of service requires cleaning to the new gas specification and verification that design pressure and materials meet the new application. The 275 PSIG rating and construction materials may limit what services are suitable; consult the original datasheet or have the unit evaluated for your intended gas.

What should I inspect on a used vaporizer before buying?

Inspect the heat exchanger fins or coil for physical damage, corrosion, or ice buildup evidence that suggests poor drainage or previous freeze damage. Verify nameplate data, check all pressure boundary welds and connections for cracking or corrosion, and confirm valve operation and instrumentation presence. Request pressure vessel certification documents and the last hydrostatic test report; units this age often need requalification before returning to service.