This container’s distinguishing structural features would be the roof that is able to be swiveled out as it consists of removable bows and tarpaulin. The walls of open-top containers are generally made of corrugated steel. The floor is made of wood.

These structural features greatly simplify the process of packing and unpacking of the container.

It should be noted, however, that the purpose of the roof bows of an open-top container is not solely to support the tarpaulin but also to contribute to container stability. Flatracks are therefore more suitable for overheight cargoes.

Lashing rings, to which the cargo may be secured, are installed in the upper and lower side rails and the corner posts. The lashing rings may take loads of up to 1,000 kg.

Usual open-top container dimensions are 20′ and 40′.

This container’s distinguishing structural features would be the roof that is able to be swiveled out as it consists of removable bows and tarpaulin. The walls of open-top containers are generally made of corrugated steel. The floor is made of wood.

These structural features greatly simplify the process of packing and unpacking of the container.

It should be noted, however, that the purpose of the roof bows of an open-top container is not solely to support the tarpaulin but also to contribute to container stability. Flatracks are therefore more suitable for overheight cargoes.

Lashing rings, to which the cargo may be secured, are installed in the upper and lower side rails and the corner posts. The lashing rings may take loads of up to 1,000 kg.

Usual open-top container dimensions are 20′ and 40′.

This type of container is widely used for goods that need to be transported at a constant temperature above or below freezing point.

The refrigeration unit is arranged in such a way that the external dimensions of the container meet ISO standards and thus fit into the container ship cell guides. Hence, the presence of an integral refrigeration unit entails a loss of internal volume and payload.

When being transported by ship, integral units have to be connected to the on-board power supply system. The number of refrigerated containers which may be connected depends on the capacity of the ship\’s power supply system. If the aforesaid capacity is too low for the refrigerated containers to be transported, “power packs” may be used, which are equipped with relatively large diesel generators and satisfy ISO requirements with regard to the dimensions of a 20″ container. When at the terminal, the containers are connected to the terminal’s power supply system. 

How cooling system works:

Air flows through the container from the bottom to the top. In general, the “warm” air is drawn off from the inside of the container, cooled in the refrigeration unit and then blown back in the container as cold air.

To ensure adequate circulation of the cold air, the floor is provided with gratings. Pallets form an additional space between container floor and cargo, so also forming a satisfactory air flow channel. In addition, the side walls of the container are “corrugated”, which ensures satisfactory air flow there too.

Packaging for reefers:

In the upper area of the container, adequate space (at least 12 cm) must likewise be provided for air flow. For this purpose, during packing of the container adequate free space must be left above the cargo. The maximum load height is marked on the side walls.

To ensure vertical air flow from bottom to top, packaging must also be appropriately designed and the cargo must be sensibly stowed.

Temperature indicator:

In the refrigeration units, both the supply and return air temperatures are measured and, depending on the operating mode, one of these values is used to control the cold air. Temperature measurement may be performed in various ways. The Partlow recorder generally records return air temperature, since this provides an indication of the state or temperature of the cargo. Data loggers are increasingly used, which detect temperature digitally and indicate it on a display. Once transferred to a PC, the data may then be evaluated.

The temperature display is attached to the outside of the refrigeration unit, so that operation of the unit may be checked at any time.

Digital or analog recorders may also be positioned directly in the cargo, so as to measure temperatures inside the container. The recorder should be accommodated in such a way that it records the temperatures at risk points in the container (inside the packaging, top layer at door end).

This type of container is widely used for goods that need to be transported at a constant temperature above or below freezing point.

The refrigeration unit is arranged in such a way that the external dimensions of the container meet ISO standards and thus fit into the container ship cell guides. Hence, the presence of an integral refrigeration unit entails a loss of internal volume and payload.

When being transported by ship, integral units have to be connected to the on-board power supply system. The number of refrigerated containers which may be connected depends on the capacity of the ship\’s power supply system. If the aforesaid capacity is too low for the refrigerated containers to be transported, “power packs” may be used, which are equipped with relatively large diesel generators and satisfy ISO requirements with regard to the dimensions of a 20″ container. When at the terminal, the containers are connected to the terminal’s power supply system. 

How cooling system works:

Air flows through the container from the bottom to the top. In general, the “warm” air is drawn off from the inside of the container, cooled in the refrigeration unit and then blown back in the container as cold air.

To ensure adequate circulation of the cold air, the floor is provided with gratings. Pallets form an additional space between container floor and cargo, so also forming a satisfactory air flow channel. In addition, the side walls of the container are “corrugated”, which ensures satisfactory air flow there too.

Packaging for reefers:

In the upper area of the container, adequate space (at least 12 cm) must likewise be provided for air flow. For this purpose, during packing of the container adequate free space must be left above the cargo. The maximum load height is marked on the side walls.

To ensure vertical air flow from bottom to top, packaging must also be appropriately designed and the cargo must be sensibly stowed.

Temperature indicator:

In the refrigeration units, both the supply and return air temperatures are measured and, depending on the operating mode, one of these values is used to control the cold air. Temperature measurement may be performed in various ways. The Partlow recorder generally records return air temperature, since this provides an indication of the state or temperature of the cargo. Data loggers are increasingly used, which detect temperature digitally and indicate it on a display. Once transferred to a PC, the data may then be evaluated.

The temperature display is attached to the outside of the refrigeration unit, so that operation of the unit may be checked at any time.

Digital or analog recorders may also be positioned directly in the cargo, so as to measure temperatures inside the container. The recorder should be accommodated in such a way that it records the temperatures at risk points in the container (inside the packaging, top layer at door end).

This container type has a floor structure with high loading capacity. Generally made of a steel frame, softwood floor and two end walls, which may either be fixed or collapsible. It typically comes in sizes of 20″ and 40″.

Some of its distinguished features are listed as below:

1. Lashing rings: A number of lashing rings are installed on side rails, corner posts and the floor. The rings enables the containers to be attached to each other. The lashing rings may take loads of up to 2000 kg for 20″ flatracks; and up to 4000 kg for 40″ flatracks.
2. Stackable: The end walls are stable enough for the cargo to be stacked on top of one another. 
3. Forklift pockets: Some types of 20″ flatracks have forklift pockets.
4. Gooseneck tunnels: 40\’ flatracks have gooseneck tunnels at each end.
5. Lashing winches: Some are equipped with lashing winches with 2 metric ton lashing belts.
6. Stanchions: For transportation of some cargoes, flatracks may be provided with stanchions. 

This container type has a floor structure with high loading capacity. Generally made of a steel frame, softwood floor and two end walls, which may either be fixed or collapsible. It typically comes in sizes of 20″ and 40″.

Some of its distinguished features are listed as below:

1. Lashing rings: A number of lashing rings are installed on side rails, corner posts and the floor. The rings enables the containers to be attached to each other. The lashing rings may take loads of up to 2000 kg for 20″ flatracks; and up to 4000 kg for 40″ flatracks.
2. Stackable: The end walls are stable enough for the cargo to be stacked on top of one another. 
3. Forklift pockets: Some types of 20″ flatracks have forklift pockets.
4. Gooseneck tunnels: 40\’ flatracks have gooseneck tunnels at each end.
5. Lashing winches: Some are equipped with lashing winches with 2 metric ton lashing belts.
6. Stanchions: For transportation of some cargoes, flatracks may be provided with stanchions.