tankscontainers

Tank containers, also called ISO tanks or tanktainers, are standardized intermodal freight containers that incorporate a bulk liquid or gas tank within a conventional ISO frame. They are designed to move liquids and gases efficiently across ships, trains, and trucks without unloading contents, enabling integrated multimodal shipments.

Construction and design: The outer structure follows the ISO container frame, and the inner tank is a pressure vessel made of stainless steel or coated steel, sometimes with insulation or special linings for food or chemical cargos. Tanks may be non-pressurized or designed for pressurized service, cryogenic service, or refrigerated temperatures depending on cargo. Many tanks include multiple compartments, valves and manholes, and fittings suitable for cleaning and venting. Materials and linings are chosen to meet hygiene or chemical resistance requirements.

Cargo types and capacities: Tank containers transport a wide range of liquids (fuels, chemicals, edible oils, wine, pharmaceutical liquids) and gases. They typically hold roughly 20,000–26,000 liters of liquid equivalent, with the outer frame bearing the allowable weight. Tank designs may be dedicated to one cargo or configured as multi-compartment units to carry different products in a single voyage. Regulations require appropriate labeling, documentation, and safety features for hazardous goods.

Operations and regulation: ISO tanks are designed for intermodal transfer and can be relocated between ships, railcars, and trucks. Their use is subject to international and national regulations governing the transport of dangerous goods, as well as company and port cleanliness and maintenance programs. Regular inspections, testing, cleaning, and reconditioning extend service life and ensure compliance.

Summary: Tank containers are a specialized form of intermodal container optimized for bulk liquids and gases, combining a robust tank vessel with an ISO-standard frame to facilitate safe, efficient, cross-border transport.