In recent years, flexitanks have emerged as an increasingly popular solution for transporting bulk liquid cargoes, offering a cost-effective, adaptable and efficient solution as compared with traditional ISO tanks. As global trade continues to evolve, more shippers are recognising the operational and economic advantages of using flexitanks.
These flexible, multi-layered bladders are designed to fit inside standard 20-foot dry containers, transforming them into efficient liquid transport units. This innovation eliminates the need for costly ISO tanks, significantly reducing costs and maintenance expenses. A key advantage of flexitanks is their versatility across multiple transport modes, making them ideal for global logistics. Their compatibility with standard containers simplifies operations and enhances supply chain efficiency. Additionally, their closed-system design minimises the risk of contamination during transit, which is especially important for food-grade and sensitive liquids. While ISO tanks are durable, reusable and suitable for hazardous or temperature-sensitive cargo, their high acquisition and cleaning costs can be a barrier for one-way shipments.
Though flexitanks offer numerous advantages, they are not without their drawbacks.
The behaviour of liquids in transit presents unique challenges. Liquids exert pressure equally in all directions, and without internal friction they can shift rapidly during movement. This makes the structural integrity of the container critical to safe transport. While ISO tanks are engineered to handle these dynamics, flexitanks rely on proper installation and the strength of the container walls to maintain stability. Further, the single-use nature of flexitanks raises environmental concerns and they are more susceptible to leakage, rupture and improper handling during loading and unloading. These vulnerabilities can lead to cargo claims if not managed properly. Common causes of claims include improper installation of the flexitank inside the container, overfilling or underfilling resulting in instability, inadequate securing during transit and exposure to sharp objects.
The IUMI Position Paper offers practical guidance and best practice for the safe use of flexible tanks for transport of liquid cargoes as practical guidance to mitigate losses. To minimise losses, proactive risk management is essential. This may include engaging trained personnel for installation and loading, conducting pre-shipment inspections, using high-quality flexitank materials and adhering to manufacturer guidelines. Flexitanks represent a transformative shift in the logistics of bulk liquid transport. While they offer compelling benefits, their successful use depends on careful planning, proper handling, and proactive loss prevention.
