Used Ambient Air Vaporizers for Sale

It's a finned-tube heat exchanger that uses heat from the surrounding air to turn cryogenic liquid into gas, with no fuel cost. Natural-draft units have no fan. Forced-draft units add a fan and lose capacity if it stops. Fins are usually aluminum, and high-pressure models use stainless or alloy tube liners.

Sources: Chart vaporizers · AIGA 027/24 · Thermax SuperGap brochure

Frost building on the fins during operation is normal and cuts output. Capacity returns after a defrost, ideally by stopping flow when the air is above freezing. Sites that run continuously use two vaporizers or banks and switch between them, so one defrosts while the other works.

Sources: Thermax Installation & Operating Instructions · AIGA 027/24 · Thermax Mega-fin brochure

Yes. In some weather they produce dense fog around the unit that sharply reduces visibility. Plan placement around roads, walkways and work areas.

Source: Thermax Installation & Operating Instructions

Nameplate flow is tied to rating conditions. One major line rates its units at 50°F, 50% humidity and 8 hours of continuous service between defrosts, adjusted by gas type. Colder weather, longer runs and ice on the fins all reduce real output, so size for winter. Continuous duty beyond the rated period calls for a switching system.

Sources: Thermax SuperGap brochure · Chart: Vaporizer sizing

Look for distortion from heavy ice or rough handling. Repeated partial thaw and refreeze can build dense ice that deforms the structure. Lightly bent fins usually don't matter unless they're badly out of position. Check for signs of leaks and damaged interconnecting tubing, and ask whether it was ever run past its rated duty or left heavily iced.

Sources: Thermax Installation & Operating Instructions · AIGA 027/24

An overdrawn or iced unit, or a changeover valve that fails to switch, can send very cold gas downstream, where carbon steel piping can crack suddenly. Guidance calls for an outlet temperature sensor with automatic shutoff, tested regularly. Some systems add an electric trim heater to hold outlet gas above a minimum temperature.

Sources: EIGA Doc 133 · AIGA 027/24

Get the nameplate and the manufacturer's datasheet showing design pressure, design code and capacity basis. Many ambient units are built to ASME B31.3 rather than as Section VIII vessels, so a U-1A may not exist and the maker's test records matter more. Changing gas service depends on the manufacturer, so contact them. Oxygen service needs cleaning for oxygen. On LNG specifically: that call is ours, not something the sources below set — we treat units built for LNG as staying in LNG service.

Sources: Thermax SuperGap brochure · ASME Form U-1A · EIGA Doc 33/18