Cambridge Standard Steel 1980 3000 Gallon Cryogenic Nitrogen Skid Tank – ASME Certified

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

The listing does not provide current vacuum readings or net evaporation rate data. Request the most recent vacuum performance test results and daily boil-off percentage, ideally measured with the tank filled to working capacity. On vacuum-jacketed tanks of this vintage, acceptable vacuum typically ranges from 50–500 microns; readings above 1,000 microns often indicate jacket contamination or a slow leak requiring evacuation and possible re-insulation.

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

This tank previously held liquid nitrogen in oilfield service. Because nitrogen is non-contaminating and chemically inert, the tank can generally be converted to liquid oxygen or liquid argon service after thorough cleaning, re-gasketing, and oxygen-cleaning procedures if switching to LOX. Conversion to hydrocarbon or flammable cryogens would require code review and is typically not permitted on ex-oxygen or ex-nitrogen vessels without extensive documentation.

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

The listing confirms the tank is NB registered and ASME Section VIII Division 1 U-stamped but does not state whether the original data plate is legible or whether the manufacturer's data report (U-1A) is on file. Request photos of the nameplate showing the NB number and MAWP, and ask the seller to provide the U-1A form or NB-certified copy, which is often required by jurisdictions for re-registration after relocation.

What is involved in relocating and re-commissioning it?

The skid-mounted design simplifies transport by flatbed or lowboy trailer; verify lifting eye integrity and total loaded weight before rigging. Re-commissioning typically requires foundation preparation or tie-down installation, pressure vessel re-inspection per local jurisdiction (many states require NB re-registration and hydrostatic retest if the tank crosses state lines or changes ownership), vacuum performance verification, and recalibration or replacement of relief valves and instrumentation. Expect to involve an authorized inspection agency for code compliance sign-off before filling.