123 DGE Hexagon Lincoln Back of Cab 3+1 Tank Package

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

These are DOT-certified composite CNG tanks (Type 4), as indicated by the certification through 2034, which is consistent with the 15-year service life typical for NGV2/FMVSS 304 CNG vehicle cylinders. DOT certification restricts use to mobile CNG fuel storage on vehicles; if you need stationary storage, you'll require ASME-rated vessels. The listing does not specify the exact DOT specification marking (likely DOT-FMVSS 304), so confirm the stamped certification with the seller.

What is the MAWP and capacity at service pressure?

The tanks are rated to 3,600 PSIG and provide a total system capacity of 50.7 DGE (diesel gallon equivalent), consisting of three 36.5 DGE tanks and one 14.2 DGE tank. For NGV composite cylinders like these, the 3,600 PSIG rating is typically both the MAWP and the service pressure, though the listing does not explicitly distinguish between the two.

What is the requalification or inspection status?

The tanks are certified good through 2034. DOT-certified Type 4 composite CNG cylinders for vehicular use typically have a 15-year service life from date of manufacture (2013 in this case, expiring 2028) or until a requalification interval, and some jurisdictions require periodic visual inspections; verify what specific inspection or recertification documentation accompanies these units and whether your application requires interval inspections before the 2034 expiration.

What should I inspect before putting it into service?

Inspect all composite overwrap for impact damage, abrasion, UV degradation, and delamination, particularly around mounting brackets and the area where the side panel is missing. Check all valves, pressure relief devices, and pigtail connections for leaks and proper function, and verify that mounting hardware and framework are intact given the missing panel. Request service records to understand duty cycle, fill history, and whether the tanks experienced any overpressure or thermal events.