Does anyone know if the rated capacities of a Caterpillar 621F and D300E are theoritical, based on the actual volume of the bowl or dump or do they take into account the loose (uncompacted) nature of the material being hauled? If they are theoritical does anyone have a factor to use to approximate the uncompacted volume?
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Earthwork Equipment Capacities
- Thread starter bdunck
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In the Caterpillar handbook, the rated volumetric capacity (struck) is the actual volume of the bowl or dump box. The heaped volume is the bowl or box itself plus the volume of a pile on top at a slope of 2:1.
The rated mass load is based on how much the vehicle is able ot carry without exceeding the maximum gross vehicle weight and therefore stepping outside it's rated brake safety certification.
Depending on the density of the material going into the bowl, either the volume or the mass could end up being the limiting factor to how much the scraper or truck is able to carry.
The rated mass load is based on how much the vehicle is able ot carry without exceeding the maximum gross vehicle weight and therefore stepping outside it's rated brake safety certification.
Depending on the density of the material going into the bowl, either the volume or the mass could end up being the limiting factor to how much the scraper or truck is able to carry.
Mabn is right. If I want to be conservative in fleet sizing, I will use 90% of the 2:1 capactiy, but I have often found the the equipment capacity is even more the the rated volume capacity. Be sure to check the material weights, and not overload the equipment based on weight capacity.
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