Air Products 20,000 Gallon Liquid Oxygen Storage Tank – 75 PSI – Horizontal Cryogenic Bulk Tank

What is the current vacuum reading, and what is the NER?

The listing does not provide the current vacuum reading or the normalized evaporation rate (NER). These are critical performance metrics for a vacuum-insulated cryogenic tank—vacuum degradation is the most common failure mode on older units, and NER determines hold time and operating cost. Ask the seller for the most recent vacuum pressure reading in microns and the measured evaporation rate as a percentage of capacity per day.

What product has it held, and what can it be converted to?

This tank was previously used in LOX (liquid oxygen) service. LOX-rated tanks can typically be converted to liquid nitrogen or liquid argon with minimal work, since oxygen service requires the most stringent cleanliness and materials compatibility. Conversion to flammable cryogens like LNG would require rerating and is generally not done due to code and materials concerns.

Is the data plate legible, and is the U-1A available?

The listing does not confirm whether the ASME data plate is legible or whether the original U-1A manufacturer's data report is available. Both documents are required for recertification in most jurisdictions and to verify design pressure, construction code year, and allowable stresses. Request photos of the data plate and copies of any available U-1A or U-1B forms before moving forward.

What is involved in relocating and re-commissioning it?

A 20,000-gallon horizontal cryogenic tank of this size typically requires heavy rigging, permits for oversize transport, and foundation work at the destination site. Re-commissioning will involve vacuum integrity testing, hydrostatic or pneumatic pressure testing per ASME requirements, recalibration of instrumentation and safety devices, and possibly replacement of gaskets, relief valves, and rupture discs depending on age and condition. The listing does not specify whether the tank has been maintained under a current inspection program or how long it has been out of service—longer idle periods generally mean more remediation work.