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EN 1090 has defined four execution classes (EXC). Each class mandates its own set of requirements, with complexity increasing as the number rises. EXC2 is the most common specification. The execution class assigned to a structure is defined by the engineering effort required to realise the project-specific design parameters.
As a steelwork contractor, you should consider the markets you routinely supply products to in order to determine your execution class. It is also worth looking at your capabilities and then choosing the highest class within your range. If you are thinking of applying for EXC1, for instance, it may be worth considering EXC2, as a relatively small increase in qualification effort would mean that you can supply the majority of the market. It might make sense to talk to a Linde expert before applying for an execution class.
Execution class 1 comprises structural components made of steel up to strength class S275 and structural components made of aluminium alloys. This includes buildings with up to 2 floors (4 floors if detached), bending beams up to 5 metres in length, projection beams up to 2 metres in length and stair railings in residential buildings. It also covers agricultural buildings such as barns.
Execution class 2 comprises all supporting structures made of steel up to strength class S700 and structural components made of aluminium alloys. This typically includes buildings with between 2 and 15 floors.
Execution class 3 refers to supporting structures made of steel up to strength class S700 and structural components made of aluminium alloys. Typical examples include buildings with more than 15 floors, pedestrian, bicycle, road and railway bridges, and crane tracks.
Execution class 4 comprises all structural components with extreme consequences for people and/or the environment in the event of failure. This refers, for instance, to rail and road bridges over densely populated residential areas or industrial plants with hazardous potential such as safety tanks in nuclear power plants.