Tank specs

Tank specs

Technical specifications of a tank container

The tank container has two main parts: the cylindrical vessel and the tank frame to support and protect the cylinder. An intermodal tank container consists of many specific features.
The list below gives you useful information on some of those specific parts.


The manlids cover the loading manholes on top of the tank container. Each manlid has 3 to 8 tightening clamps with swing bolts, depending on the size of the manlid. The insulated manlid covers avoid loss of temperature. They also offer space to carry sample bottles and keep the loading area clean and well protected. No-slip zones inside the manlid covers increase the operational safety.




Double walkways with cross sections around the manlid areas.




Safety handrails

2 collapsible handrails covering the full length of the tank container allowing safe access to the top of the tank for loading purposes.




Certificate plate

Each tank container has a certificate plate. It can be located in different places, but usually the plate can be found in one of the bottom corners. The plate acts as a passport for the tank container, indicating significant data and recording the test period validity.



Bottom discharge valve – triple closure

The bottom valves are used to discharge the tank container. The construction of the inner foot valve prevents the tank container from leaking during a severe incident where all external valve segments would have been ripped off. The triple closure system ensures maximum safety during transport and discharge of the tank. Huktra adds a fourth closing device in the format of a swinging blank flange which can replace the dust cap when required.



Remote control

The remote control allows the driver and the operator to close each discharge valve from a protected and therefore safe location angle.





Digital thermometers improve the accuracy of temperature recording in transit.




Safety valve – safety relief

The pressure safety valve is a two-directional valve that releases the pressure inside the tank container when it exceeds the certified working pressure. It opens in the other direction to let in atmosphere air and pressure in case the tank container undergoes vacuum sucking beyond its certified maximum.



Document tube

The sealed document tube carries papers concerning the transport action of the tank container (for example the CMR document). For safety and extra protection, the document tube is located inside the discharge box (bottom-center on the picture to the left).



Steam trap – steam relief valve

The steam relief valve releases cooled down steam in the form of a mixture of humid hot air and water at the end of the steam coils, ensuring live hot steam continually replaces the cooled down steam. A properly functioning steam relief valve opens and closes in a continuous cycle.




Calibration chart

The calibration chart is used to calculate the exact amount of product that is loaded into the tank, in liters. For example: there is only 20 cm of empty space remaining inside the tank (this is measured with the dipstick). A quick look on the calibration chart for this specific tank shows us that there is 30,130 Ltrs of product inside the tank.




The ladder is used to get on top of the tank container and is made of stainless steel. Better tank containers have specially designed ladders that ensure safe access:

  • sufficient footspace between each step and the tankframe
  • handgrips where the ladder connects up to the walkways
  • bent design rather then a straight ladder format