National Pittsburgh Air Tank

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

This is an ASME-rated vessel. ASME certification allows for stationary installation at your facility for air storage or other gas service compatible with the vessel's metallurgy and design conditions, whereas DOT certification would be required for mobile or transportation use.

What is the MAWP and capacity at service pressure?

The maximum allowable working pressure is 2600 PSIG. The listing does not provide vessel capacity in gallons or cubic feet; you'll need to request the nameplate dimensions or volume rating from the seller.

What should I inspect before putting it into service?

Verify the ASME nameplate is intact and legible, then conduct external inspection for corrosion, dents, and coating condition. Check all threaded connections, valves, and pressure relief devices for serviceability, and arrange for internal inspection and hydrostatic testing per your jurisdiction's pressure vessel code requirements if current certification cannot be verified.