Location: GLO - Global
The inventory refers to 1 productive machine hour (PMS) - referring to the operational time of the machine including breaks up to 15 minutes - of a "downhill"yarding system with a sledge based winch, with an engine power of 55 kW and a total weight of 4,800 kg, plus two cables (for downhill yarding) and carriage.
Cable yarding is the process of transporting logs to the landing using a stationary winching machine (a yarder) and a system of heavy wire rope. Cable yarding is primarily used on the West Coast of North America with yarder, loaders and grapple yarders, but also in Europe (Austria, Switzerland, Czech Republic, France, Italy).
These systems are best suited for steep terrain or soft soils that restrict ground operations. All cable yarding systems can move wood uphill to a landing; some systems can also bring wood downhill to the landing. Extraction distance is generally longer than with other ground-based systems and may reach over more than 600 m. Depending on the type of rigging and yarder capability, cable yarding can be used in selection harvests as well as clearcuts.
Cable yarding systems are often paired with manual felling and processing because of the steep terrain
The inventoried yarding system consists of a sled yarder with a total weight of 1,550 kg, a carriage (320 kg), ancillary material (500 kg) and the required cables (2770 kg); the sledge based winch has an engine power of 55 kW and a the machinery (excluding cables) has a maintenance factor of 0.3. The assumed yarding lenght is 1000 m
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Undefined unit processes (UPRs) are the unlinked, multi-product activity datasets that form the basis for all of the system models available in the ecoinvent database. This is the way the datasets are obtained and entered into the database by the data providers. These activity datasets are useful for investigating the environmental impacts of a specific activity (gate-to-gate), without regard to its upstream or downstream impacts.