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How Measure The Coal Stock


                                Why need measurement of coal stock

  • Coal storage is measured to check the production of coal from mine
  • For ensure book stock and consumption of coal is matching with the physical stock available on date.
  • For calculate production cost of coal.
  • For prepare monthly bill of contractors.
  • For finding mining loss during mining operation.
Coal stock measurement is a big challenge in surveying. 

The accuracy of coal stock measurement is depend on 
i. The method use of surveying in the measurement of heap or coal stock
ii. The density or conversion factor.

There are many method is use for surveying purposes of the measurement of coal stock.


A. Theodolite or compass and level  instrument method.:- In this method a traverse survey of the coal stock  with theodolite or compass and chain . Levelling work is complete by level instrument.
(a) A plan showing the position of the coal stock and other necessary details on a small scale.


(b) A Contour plan showing the spot levels and contours at 1 MT interval on a large scale.







(c) Compression factor should be known before.
To the measurement of coal stock, prepare the position of the stock approximately level.

Before the start the stocked of coal in yard, complete survey work and take reduced level at 2mt or 5mt interval of original ground level.

After a period when required the volume of the stock, complete the survey work in three steps.

(a) Survey and levelling work of bottom of the stock.

(b) Survey and levelling of the slope of the stock.

(c) Survey and levelling of the top of the stock.

    Reduced level of the above steps taken 2or 5mt interval.
               
           A plan of large scale prepare and write the both reduced level in different colour of 2or 5mt interval.

        Calculate the area of each cross-section and finally calculate the volume of coal by the trapezoidal rule.
                                                 

Ton of coal = volume of coal in m3 × Density of stock yard

FOR MORE ABOUT VOLUME CALCULATION READ FOLLOWING BOOKS




DISVANTAGE OF THIS METHOD

This method is take more time and more labours.
This method is used for small stock yard.
(B ) Survey by Total Station:- Survey by total station  is used for rapid measurement and for  large quantity of stock yard. In this method the random readings taken as per actual profile of stock yard or on the cross sections line. After surveying completed calculate the volume of the profile volume calculation software.
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(C) Survey by 3D Laser scaning Technology:- 3D Laser scaning Technology also use in measure the coal stock. Read More

(D) Survey by Drone Survey:-Drone Survey has the basis of aerial Photographic Surveying. It is also used in volume measurement in coal stock yard. READ MORE
Note: (A) compression factor change due to size, age, mode
  
          (B) Large stocks get more compressed then small stocks

          ( C) Different grade of heap also measured.

   Calculation from software based on https://www.technoupendra.com/2020/03/how-to-create-tin-volume-surface.html surface.




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