Mobile Vaporizer 55 MCFH / 700psi for LNG / LOX / LIN / LAR

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

This unit is rated for 55 MCFH output. The listing states it will deliver approximately 55,000 scfh for 8 hours straight, then requires about 8 hours of defrosting before it can be used for the next 8 hours. If you need continuous flow without interruption, you'll need two units operating in alternating duty, which the listing notes this vaporizer is designed to support.

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

Ambient air vaporizers typically derate significantly in cold weather because heat transfer depends on the temperature difference between ambient air and cryogenic liquid; capacity can drop 30–50% or more below freezing. High humidity accelerates frost buildup on the fins, reducing effective surface area and further cutting capacity. The listing indicates this unit requires 8 hours of defrosting after 8 hours straight of operation, which is consistent with batch duty operation rather than true continuous service in most climates.

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

This is a new 2025 unit with no prior service history. Generally, ambient vaporizers rated for oxygen service (like this unit, which lists LOX compatibility) are built to oxygen-clean standards and can handle inert gases, but converting a unit that previously ran hydrocarbons or LNG into oxygen service requires complete cleaning, inspection, and recertification due to ignition risk. The listing states this unit is rated for LNG, LN2, LOX, and LAR from new.

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

This unit is listed as new, so typical used-equipment concerns don't apply here. On used ambient vaporizers generally, inspect fin-to-tube welds for cracks from thermal cycling, check aluminum tubing for corrosion or pitting especially at weld zones, verify flange faces are flat and undamaged, and confirm ASME code stamping and any required oxygen-service documentation is present and legible. Frost patterns during a live test can reveal internal flow restrictions or partial tube blockages.