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| The most significant stages of the product lifeThe LCA in figure (3.44) is divided into the various stages of the hydraulic product life. This provides a picture of where in the hydraulic product system the potential impacts and resource consumptions arise. As
shown in figure (3.44), the environmental potential impacts profile is
divided into four stages, where the potentials for global warming,
acidification, photochemical ozone creation and nutrient enrichment are dominant
in the hydraulic product system. The use stage of the hydraulic motor is the
most significant stage, and has a significant contribution to global warming,
acidification, photochemical ozone creation and nutrient enrichment potential
impacts categories. As mentioned in the above section and in appendix C,
chapter 7, section (7.4), the energy consumption is the greatest
contribution to the impacts categories. In the use
stage, global warming potential impact also affects the environmental impacts
acidification, nutrient enrichment and photochemical ozone creation. The
raw material + semi products stage accounts for the most significant
contribution to persistent toxicity, eco-toxicity, slag and ashes, hazardous
waste radioactive waste and bulk waste It is evident that the contribution of
the bulk waste potential impact category is much greater in the raw material +
semi products stage than in the disposal stage. This is attributed to the fact
that the quantities of waste from coal mining significantly exceed the
quantities of materials, which end in the landfill after disposal.
Figure
(3.44):
Weighted environmental impact potentials and resource consumption divided by
stages of the hydraulic product system..
It
should be noted that the minus (-) impact categories means the credited impact
potentials and metals in recycled materials. Resource
consumption is classified into four stages in the hydraulic motor OMV/W-800
product life in figure (3.44), which shows very clearly that the most
significant consumption of energy related resources (crude oil, natural gas and
water) is in the use stage. (The greatest fraction of the energy consumption
occurs here.) As mentioned in the previous section the gasoline oil is used as
gasoline energy in the different applications. The resources contained in the
gasoline oil are represented by crude oil and natural gas. Consumption
of material related resources lie in the raw material + semi products stage,
which is presented by nickel, molybdenum, coal, natural gas and manganese etc.
The insignificant resources in the profile are not included in the figure
(3.44). The
manufacturing stage is an insignificant stage in the hydraulic product system in
resource consumption. The graph bars are invisible but still affect resource
consumption. Very low graph-bars can be seen on coal and crude oil, which are
electricity-related and transported-related resource in the manufacturing stage.
The
disposal stage of the hydraulic product system is credited energy related and
material-related resources in the product system.
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