I am working with a project where I am mapping Lindab Circular ventilation ducts (EPD declaration number - NEPD-2990-1667-EN) with different diameters. The EPD is declared for 1-meter-long pipe with Ø125. When I look at the materials created for the different diameter, the only difference I see is weight/ declared unit changing. Still the mapping from model is running meter. Do we have to convert all the pipes in Kg for the calculation? If we must convert all the pipes in Kg unit, why do we have materials created for different diameters or is there any way to work with scaling factor here that I am missing?
P.S. EPD also needs update for Ø125 as the weight /meter is not correct. Which will affect the results if Kg unit is used.
Yes, that is correct: the primary difference between the materials for the different diameters is the declared weight per meter, which varies with the diameter. The EPD itself is declared per kg (even though the reference product is stated as 1 meter Ø125), and the environmental indicators are therefore scaled based on weight.
The reason materials are created for the different diameters is precisely to ensure correct scaling of the environmental impact based on weight differences between dimensions.
It is therefore important to use the EPD and the associated weight data that correspond to the specific diameter.
As you also mention, the EPD for Ø125 should be updated, as an incorrect weight per meter will directly affect the results when the calculation is weight-based. I have corrected the error.
I still think we are not scaling the results with increasing Ø / material use. To do that you need 3 input values (we add scaling factor as third value in LCAByg), which is not the case here.
I am attaching the image when you try to compare this materials, and it reflects my concerns.
We are fully aware that, at this point, it is not possible to compare materials that have identical indicator values but different densities. I completely understand the concern; however, when using the EPD, we differentiate based on density. This means that the calculation is correct.
We are currently looking into a solution where density will also be included directly when comparisons are made at material level.
