143 GGE CNG Storage Package - Quantum, Back of the cab, 3 tanks pack. Tanks 26x72 (Capacity: 46.7 or 500L each)

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

These tanks were originally built to meet DOT safety standards for on-road use and comply with current on-road safety requirements according to the listing. DOT certification allows installation on vehicles for fuel storage, whereas ASME vessels are typically restricted to stationary service. The listing does not specify whether dual ASME certification exists for stationary applications, so confirm with the seller if you intend to use these tanks in fixed installations rather than on vehicles.

What is the MAWP and capacity at service pressure?

The pressure rating is 3,600 PSI and total capacity per package is 143 GGE (500L per tank, three tanks per package). The listing does not distinguish between MAWP and service pressure, which are the same for most CNG fuel tanks designed for vehicle use. Note that the structured fields list Quantum as manufacturer while the description identifies the tanks as manufactured by Hexagon/Lincoln and Agility—clarify the actual manufacturer with the seller for documentation purposes.

What is the requalification or inspection status?

The tanks were visually inspected after removal from service and found to be in excellent condition, but the listing does not state whether current DOT certification is valid or when the last hydrostatic test was performed. Optional DOT re-certification is available to add three more years of service life. Type 4 composite CNG cylinders typically require recertification every three to five years depending on the DOT specification; confirm the current certification status and expiration date before purchase.

What should I inspect before putting it into service?

Inspect the composite overwrap for impact damage, abrasion, cuts, or delamination, particularly around mounting brackets and along the cylinder body. Check all boss threads, valves, and pressure relief devices for damage or corrosion, and verify that mounting hardware and fuel lines are complete (the listing notes some packages may be missing minor components). Type 4 tanks are sensitive to UV exposure and impact damage that may not be immediately visible, so review the certification labels and manufacturing date codes to confirm remaining service life, and consider having a qualified inspector perform a detailed assessment if documentation is incomplete.