5500 PSI ASME Gas Storage, 3-Pack – 85 Cu Ft | 20,700 SCFH

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

These are ASME Section VIII, Division 1 vessels with National Board registration, built for stationary installation. ASME vessels are designed for fixed-location service—buffer storage, process gas supply, or ancillary equipment feeding—and cannot be used for transportation or mobile applications, which require DOT certification. If you need to move gas over the road, you'll need DOT cylinders or tube trailers.

What is the MAWP and capacity at service pressure?

MAWP is 5,500 PSIG at 200°F. Each bottle holds 58 Cu Ft water volume, which translates to 18,900 SCF of CNG at 4,200 PSI or 16,600 SCF of N₂ per bottle as stated in the listing.

What is the requalification or inspection status?

The listing does not state whether these vessels have current or recent CSD-1 inspections, what the last internal examination date was, or whether National Board Forms are available. Contact the seller for inspection records, remaining thickness readings, and whether jurisdiction approval has been maintained. ASME stationary vessels typically require internal inspection on intervals set by the jurisdiction or insurer, commonly 5 to 10 years depending on service and corrosion history.

What should I inspect before putting it into service?

Verify current wall thickness via UT to confirm adequate remaining metal against corrosion allowance, and inspect all nozzles, threaded connections, and welds for cracking or degradation. Check relief valves for current certification and set pressure, and confirm the vessels are still within National Board registry if required by your jurisdiction. Previous service dictates cleaning and compatibility; if these held sour gas, hydrogen sulfide, or any contaminant incompatible with your intended gas, factor in cleaning or internal coating requirements.