No — intermodal containers used in international traffic are typically eligible for duty-free or bonded entry under specific HTS provisions and CBP regulations governing instruments of international traffic, provided they are not sold or transferred to domestic use. Permanently installed storage tanks and pressure vessels are dutiable articles and do not qualify for this treatment.

Most US states require that imported pressure vessels and boilers bear an ASME stamp or equivalent certification, issued by an authorized inspection agency, confirming the unit was designed and manufactured to applicable ASME Boiler and Pressure Vessel Code sections. Importers should confirm the specific state or jurisdiction's requirements before shipment, as non-stamped vessels may be barred from installation.