Special tank container
What makes a tank container special?
We consider a tank container “special” when it cannot fit into standard classifications. These containers come in a wide variety of forms, each designed for specific purposes. We can divide them into the following categories:
1. High-specification tank containers
Manufacturers build high-specification tank containers to a higher T-code than the standard T14, typically T20 or T22. On request, we can arrange for these tank containers to have an ASME U stamp approval, required for transporting Class 6.1 products in the USA. Class 6.1 products are toxic by inhalation and require special attention to closures and gaskets. These tank containers are made with a bolted manlid, preferably with a tongue-and-groove manlid seal, full-flanged ball valves, and a nitrogen connection, as operators load and discharge these products under a closed circuit with nitrogen overpressure.
2. High-temperature tank containers
Engineers design standard containers to handle a maximum temperature of 130°C. However, products requiring high temperatures need special attention during both loading and discharge operations. This includes considering the material used for the container, its design (since the barrel dimensions will fluctuate due to high temperatures), and the temperature needed during transport. You should apply insulation to spill boxes and bottom cabinets, and also consider heating the valves. Warming the product before discharge may also be necessary.
3. Modifcations for operational needs
Certain products or processes require modifications to the tank containers. Notable examples include containers with legs for easy drop-off from a chassis or mixing devices to keep products moving during storage.
Tank containers built for a dedicated product
Some products have special requirements, which may be dictated by regulations. However, sometimes the market demands higher-specification tank containers than the standard requirements.
For example, tank containers built for hydrogen peroxide are typically uninsulated tanks fitted with a breather valve and a 10” bursting disc. These features are designed to ensure safety during transport.
In contrast, tank containers built for ethylene oxide are constructed to higher specifications. The market often uses tank containers built like gas tanks (T50) but certified for liquid transport. The reason behind this design is safety.
Tank containers with an internal lining or coating
Although stainless steel works well with many products, some products are incompatible with it. Chlorine is often the main problem, so it’s important to understand the chemicals involved and study the MSDS before selecting a tank container. A commonly used protection method is a lining or coating.
A lining consists of sheets applied to the surface, such as PTFE or rubber, while a coating is sprayed onto the surface. The process may seem simple, but it requires full attention to detail, including:
– avoiding sharp edges
– thoroughly cleaning the stainless steel to remove any remnants of previous products
– maintaining a clean work environment
– controlling the temperature during both application and curing
– selecting the proper materials for valves
– preparing the flanges
– choosing the right type of manlid
– selecting appropriate gasket materials
– properly labelling the tank container.
The success of a lined tank container depends on both the manufacture/application process and how the tank is operated. Operators must follow a strict inspection programme and control the interior environment. In most cases, you need to maintain nitrogen overpressure to ensure safety and proper conditions inside the tank.
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