Fiba 20 Ft ISO Tube Skid – 3,250 PSI – 69,772 SCF Capacity – DOT-3T-3150 Container Helium, Nitrogen, Argon

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

This is DOT rated—specifically DOT-3T-3150 for each of the eight tubes. DOT certification allows you to transport compressed gases over public roads, making this suitable for mobile applications, temporary supply, and cascade systems where you need to move gas storage between sites. ASME vessels are stationary only and cannot be legally transported when pressurized.

What is the MAWP and capacity at service pressure?

MAWP is 3,250 PSI. Gas capacity is 69,772 SCF when charged with nitrogen at working pressure, with a total water volume of 341 cu ft across all eight tubes. Capacity for other gases will differ based on their compressibility factors—helium will store fewer SCF at the same pressure, while denser gases will store more.

What is the requalification or inspection status?

The listing shows conflicting DOT test dates—one states current through 03/2030, another shows test date 03/2025 with next due 03/2030. You'll need to clarify with the seller which is accurate and request the actual requalification documentation showing the last hydrostatic test date. DOT-3T tubes typically require requalification every five years.

What should I inspect before putting it into service?

Verify the current hydrostatic test documentation for all eight tubes and confirm the stamps are legible and match. Inspect the ISO frame for structural damage, check all valves and manifold connections for leaks or damage, and examine tube exteriors for corrosion, dents, or gouges that could indicate impact damage. If you're switching service gases, confirm the metallurgy and previous service are compatible with your intended use—hydrogen embrittlement and contamination concerns can rule out certain conversions.