I would like to model the usage phase of a mobile water tank. The tank is transported on a tractor or lorry so I need to model the transportation too. My problem is that when I select a transportation method in SimaPro, I have to input it in kg*km. I am assuming that whenever the water tanks are transported, full or not, the full capacity of the lorry or tractor is being used. Do I then use the tonnage of the lorry/tractor to calculate the kg*km or should I still use the weight of the tank itself? I am thinking an error can come in if the program assumes 2 tanks can be transported at the same time, for example.
when dealing with transport is advisable to use a unit in mass/distance. Many datasets from Ecoivnet are in that format. Cheers E
" Do I then use the tonnage of the lorry/tractor to calculate the kg*km or should I still use the weight of the tank itself? " You should only use the Load weight. The mass of the vehicle is taken into consideration with the selection of vehicle you make.
Sergio Romero-Hernández You first estimate the transport distance and calculate the weight of the tank, by multiplying those values you get the t*km- Depending on the weight of the tank you have to select the a lorry with enough weigh capacity. Moreover you should check if the volumetric capacity of the lorry is enough to transport the tank. It happen when dealing with this kind of objects, that the volumetric capacity will be reached before the weigh capacity. This will induce an inefficiency into to the system and should be address in the calculations. A final detail is to see if the transport is one directional or two directional, is the truck coming back empty after delivering the tank? then you should adjust your t*km value to reflect that. E
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