CPI ASME Cryogenic Storage Vessel — 34.9L High-Pressure

Is this ASME or DOT rated, and what does that allow me to do with it?

This vessel is ASME-coded, which qualifies it for stationary installation at a fixed facility. ASME vessels are designed for permanent mounting and cannot be transported filled on public roads, unlike DOT cylinders which are certified for transport. Verify the nameplate data and whether your jurisdiction requires state or local registration for pressure vessels at this rating.

What is the MAWP and capacity at service pressure?

The listing states a rated working pressure of 4000 PSI and a capacity of 34.9 liters. Confirm with the seller whether this capacity figure represents water volume, liquid cryogen volume, or gas equivalent at a specified pressure, as this distinction affects actual usable storage. MAWP should be stamped on the vessel nameplate along with the hydro test pressure.

What is the requalification or inspection status?

The listing does not provide inspection or requalification dates. Request documentation showing the most recent hydrostatic test, the original U-1 manufacturer's data report, and any CSD-1 inspection records if this vessel has been in cryogenic service. ASME Section VIII vessels in cryogenic duty typically require periodic internal and external inspection per the owner's jurisdiction and insurance requirements.

What should I inspect before putting it into service?

Inspect the vacuum jacket integrity by checking for frost patterns or abnormal boil-off rates that indicate vacuum loss. Examine all pressure relief devices for proper set pressure and current certification dates, verify fitting and valve condition for cracking or seat leakage, and check the support saddles and mounting points for corrosion or stress cracking. Given the 4000 PSI rating, have the vessel hydrostatically tested and the inner vessel inspected for embrittlement if service history is unknown.