275 PSI 20,000 SCFH N2 Vaporizer

Is this sized for my peak demand or my average?

Ambient air vaporizers are typically sized for peak demand with a safety margin, since their output derates significantly in cold weather—a unit rated at 60°F ambient may deliver only 60-70% of nameplate capacity at 0°F. This unit is rated at 20,000 SCFH nitrogen capacity, but the listing does not specify the ambient temperature at which that figure was established, so confirm the rating basis and your expected ambient range with the seller. For continuous duty in variable weather, many operators size to a margin above actual peak flow to maintain delivery during cold snaps.

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

The listing does not state what gas this vaporizer previously handled. Ambient vaporizers used for nitrogen can typically be redeployed for argon or oxygen after proper cleaning and inspection, but oxygen service requires hydrocarbon-free construction and rigorous degreasing to ASTM G93 or CGA standards. Confirm prior service history and any necessary cleaning or material compatibility verification with the seller before committing to a specific gas.

What are the installation and utility requirements?

This is an ambient air vaporizer, so it requires no external heat source or electrical power—heat transfer relies entirely on natural convection from surrounding air. Dimensions are 58" x 76" x 112" and connections are 1-1/2" tongue-and-groove flanges, so plan for adequate clearance around the fin bundle for airflow and future tube inspection. The listing does not specify foundation requirements or wind load rating; request any original installation drawings or structural data from the seller.

What should I inspect on a used vaporizer before buying?

Inspect fin-to-tube joints for separation or corrosion, particularly at the bottom where moisture collects, and check the aluminum fins for bent or crushed sections that reduce effective surface area. Pressure-test the coil to the MAWP of 275 PSIG and verify flange faces and gasket surfaces are undamaged. These units were manufactured in 1986, so request any hydrostatic test records since original fabrication and confirm whether the seller will allow internal inspection of tube condition before purchase.