CPI 225-Gallon DOT-107A Tube Skid — 3000 PSIG High-Pressure

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

This is a DOT-107A certified tube skid, which allows it to be transported over public highways while charged with compressed gas. DOT-107A vessels are designed as permanent highway transport units, typically mounted on trailers or skids for mobile compressed gas delivery. Unlike stationary ASME vessels, DOT cylinders require periodic requalification but can be filled at one location and transported to another while maintaining pressure.

What is the MAWP and capacity at service pressure?

The unit is rated for 3000 PSIG with a 225-gallon water capacity. The listing does not specify the MAWP separately from the working pressure rating, though on DOT tube skids these are often the same; confirm the test pressure and any operating restrictions with the seller if you plan to run at maximum allowable pressure continuously.

What is the requalification or inspection status?

The listing states this is a 2025 new unit but does not provide hydrostatic test date, original qualification paperwork, or DOT certification markings. DOT-107A tube skids typically require requalification every 5 or 10 years depending on service and construction details. Request the manufacturer's data reports, original hydro documentation, and stamped compliance certificates before purchase.

What should I inspect before putting it into service?

Verify all DOT compliance stampings are legible on each tube, confirm the skid frame has no cracks or corrosion at tube saddles and tie-down points, and inspect all valves, manifolds, and pigtails for damage during transport or storage. On tube skids, check that relief devices are present and within their service life, examine the I-beam frame for structural integrity at the 5-ton lift points, and confirm all tubes are individually marked with test pressure and dates. Request any previous service records to identify what gas the unit held, as this determines cleaning requirements and compatibility with your intended service.