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Calculation of raw material and product mesh sizes for crusher in chemical process plant

Calculation of raw material and product mesh sizes for crusher in chemical process plant

Calculation of raw material and product mesh sizes for crusher in chemical process plant

(OP)
Hi,

I have come across a problem in a textbook that I need some assistance with.

The problem is reproduced below, and asks you to determine the power input for a crusher in a chemical process plant.



The part I don't understand is 'Step 3' of the calculation procedure: Compute the raw-material and product mesh sizes (see above picture in yellow highlight).

They use the relationship: dr and dp = s/12 for calculating the mesh sizes, but where does the '12' come from? 

From my research, it seems to be the number of openings in the mesh? Refer link: https://www.industrialspec.com/resources/mesh-and-micron-sizes#:~:text=Mesh%20size%20is%20referring%20to,one%20linear%20inch%20of%20screen 

Thanks,

RE: Calculation of raw material and product mesh sizes for crusher in chemical process plant

"s = mesh opening measure used". s is in inches, abbreviated as "in."

It's just a conversion from inches to feet. 1 foot = 12 inches.

Good Luck,
Latexman

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