![]() Where: Pr = radius of central section peak (Horizontal distance from stacker pivot to peak of central section)ī = angle (in degrees) formed by radii at limits of central section peak The capacity analysis is identical to that for an elongated pile except that the arc length of the center section is substituted for the value L in Equal 4 above. A kidney-shaped pile such as that formed by a radial stacker is merely a variation of the elongated pile. The total capacity of an elongated pile is the sum of the results of Equation 1 and Equation 4. Where: r = radius of end half cone in feet Where: R = radius of end half cone in metersįor a value of A of 38 degrees, Equation 4 reduces to:ħ.81 x 10 -4 R²LD = capacity in metric tons…………………………….(5)Įquation 5 expressed in English units is:ģ.91 x 10 -4 r²ld = capacity in short tons………………………………….(6) The capacity of the center section of the elongated pile is given by: The end half cones can be combined to form a single conical pile which can be analyzed using Equation 1, 2 or 3 above. The capacity of the stockpile can easily be determined by considering the pile as two separate volumes. The elongated stockpile and its variations are the most common stockpile form in high capacity installations. For example, if 1600 kg/m³ (100 lb/ ft³) material is being stockpiled on soil with an allowable bearing pressure of 14 680 kg/m³ (3000 lb/ft³) the maximum permissible conical stockpile is about 27.4m (90 ft.) high and has a total storage capacity of about 56 000 metric tons (62 000 short tons). More importantly, because the conical pile occupies such a small ground area in relation to its volume, soil pressures on large piles can exceed the bearing strength of the local soil. This results in very long conveyors and supports and accompanying large foundations to withstand the loads on the conveyor. One disadvantage is that very high stockpiles are required to attain large storage capacities. The main advantage of the conical pile is that it can easily be built by dozing equipment or a fixed belt conveyor. Substituting this value for A reduces Equation 1 to:Ĩ.18 x 10 -4 R☽ = capacity in metric tons………………….(2)Ĥ.09 x 10 -4 r³d = capacity in short tons…………………(3)įor convenience, typical stockpile capacities have been tabulated in both metric and English units in Table 1. ![]() This fact will become important later in considerations of live storage capacity.įor many common materials, the angle of repose, A, is about 38 degrees. One should also observe at this point that one-half of the capacity of the stockpile is in the lower 1/5 of the pile. Increasing the height of the stockpile by 26% results in a doubling of the stockpile capacity. This means that the capacity of the conical pile grows very rapidly as the height (and hence the radius of the pile) increases. Note that the capacity of the conical stockpile varies with the cube of the radius of the pile. The total stockpile capacity is given by:ģ.14 (Tan A)R³ D/3000 = capacity in metric tons…………………(1)Ī = angle of repose for material to be stockpiled The conical stockpile is the simplest and easiest to analyze. Stockpiles fall into two general categories: conical and elongated. Pricing for the service is unfortunate unpublished, but you can fill out this form to inquire about pricing for your job site.Calculating Stockpile Capacity: Once the minimum storage capacities which will assure maximum mill output are known, the appropriate stockpile configuration must be determined. More importantly you gain valuable historical data with a few clicks of a button. Droneįor those contractors that are partaking in the drone craze, you can even use your own drone to take aerial images of your stockpiles, upload them to the program, and get your results.Īccording to the company website, the accuracy of the data is between 2-4%. The only other thing the users need to do is tag the stockpile and view the results. Aerial PhotosĬustomers of Stockpile Reports can request an aerial flight directly through the company and will receive their stockpile data within hours of the flight. The iPhone app can be downloaded by clicking here. Simply position the cones 25 feet (10m) apart and in front of the stockpile, select the stockpile material in the Stockpiles app, and walk around the pile while taking a video. The great thing about this app is that it doesn’t require any special equipment or training, just an iPhone, 2 orange traffic cones and a tape measure.
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