New Mobile Vaporizer 74 MCFH 700psi for LNG, LOX, LIN, LAR

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

This unit is rated at 74 MCFH based on nitrogen service with 150 psi inlet pressure at 70°F ambient. Ambient vaporizers typically deliver rated capacity only under design conditions; LNG will yield different flow rates than nitrogen due to differences in latent heat of vaporization, and your actual throughput will scale with delta-T between cryogenic inlet and ambient air. The listing notes this unit will deliver around 74,000 scfh for 8 hours per day on nitrogen, but does not specify continuous duty capacity or derating factors for other gases—ask the seller for performance curves specific to your gas and operating profile.

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

Ambient air vaporizers lose capacity as ambient temperature drops because heat transfer is driven purely by the temperature differential between air and cryogenic fluid; a unit that delivers full rated flow at 70°F may produce significantly less in winter conditions depending on design margins. High humidity accelerates frost buildup on fin surfaces, which insulates the tubes and further reduces output until the frost melts or is mechanically removed. Continuous duty typically requires oversizing compared to intermittent service to account for sustained frost accumulation and reduced effective surface area—this listing does not state continuous duty ratings, so confirm the actual 24/7 capacity with the seller if that matches your application.

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

This unit is new and has not been in service. Ambient vaporizers are generally compatible with multiple cryogenic gases as listed (LNG, LN2, LOX, LAR) because the aluminum construction and ASME B31.3 code compliance address the low-temperature requirements common to all these fluids, though switching to oxygen service requires rigorous cleaning to remove hydrocarbon contamination and compliance with CGA or EIGA oxygen cleaning standards.

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

This unit is new, but on used ambient vaporizers the primary concerns are fin-to-tube bond integrity (look for separation, corrosion, or previous weld repairs), tube wall thinning from internal or external corrosion, and leakage at inlet/outlet connections or tube welds. Inspect the aluminum tubing for cracks, especially near welds and bends, check that fins are not severely bent or missing (reducing effective surface area), and verify all code stamps and hydrostatic test documentation are present and current.