ASME 4-Tube Gas Storage Skid 5500 PSI CPI 136 Cu Ft High Pressure Storage System

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

This is ASME rated with NBD registration, which qualifies it for stationary or portable industrial gas storage at fixed installations but does not permit over-the-road transport as a cargo vessel. DOT certification would be required if you intend to transport it as a loaded pressure vessel on public roads. ASME vessels are typically used for on-site storage, virtual pipeline depot applications, or skid-mounted systems that remain at a job site for the duration of a project.

What is the MAWP and capacity at service pressure?

The design pressure is 5,500 PSIG with a working pressure of 5,000 PSIG, and total capacity is 136 Cu Ft. MAWP is typically stamped on the ASME data plates of each individual tube; confirm the actual MAWP from the vessel stamps, as design pressure and MAWP are not always identical depending on construction details and allowable stress calculations.

What is the requalification or inspection status?

The listing states it is sold as-is and not currently certified for immediate deployment, with recertification or refurbishment likely required depending on your application. ASME pressure vessels in industrial gas service typically require periodic internal and external inspection per the jurisdictional authority and your insurance carrier's requirements, though ASME does not mandate a fixed requalification interval the way DOT does. Ask the seller for the last in-service date, previous inspection records, and whether the NBD registrations are current.

What should I inspect before putting it into service?

Verify the ASME data plates and NBD stamps are intact and legible on each tube, inspect for external corrosion or impact damage especially at supports and saddles, and confirm all pressure relief devices are present and within their test dates. Internal inspection is typically required after extended storage or if service history is unknown; check for moisture ingress, internal corrosion, and previous gas service to ensure material compatibility with your intended gas. Confirm all manifold valves, piping, and fittings are appropriate for 5,000 PSI service and compatible with your gas—previous service with certain gases may preclude use with oxygen or other reactive gases without thorough cleaning and re-passivation.