# Cut point data:shale shaker example

Create a shale shaker cut point curve using the following known data:
. Well flow rate=560 gpm
. Density of feed=8.90 lb/gal
. Container used to collect effluent sample=1.80 lb
. Total effluent sample and container weight=41.5 lb
. Trough used to collect discard sample=38.1 lb
. Time to collect the discard sample=1.00 minute
. Total discard sample and trough weight=56.5 lb
1. Calculate the mass flow rate of the system=560 gpm*8.90 lb/gal=4984 lb/min.
2. Determine the weight of the effluent sample=41.5 lb-1.80 lb=39.7 lb.
3. After sieving, drying, and weighing the effluent solids, document the individual weights of the solids on each size sieve.
4. Calculate the weight of the discard sample=56.5 lb-38.1 lb=18.4 lb.
5. After sieving, drying, and weighing the discard solids, record the individual weights of the solids on each size sieve.
6. Calculate the wet discard flow rate=18.4 lb / 1.00 minute=18.4 lb/min.
7. Calculate the effluent flow rate=4984 lb/min-18.4 lb/min=4965.6 lb/min.
8. Calculate the effluent sample time=39.7 lb / 4965.6 lb/min=0.008 minutes
9. Determine the rate of solids collected on each individual sieve size for the discard sample.
Example for 37 micron sieve=8.80 grams /1.00 minute=8.80 grams/minute
10. Determine the rate of solids collected on each individual sieve size for the effluent sample.
Example for 37 micron sieve=17.7 grams /0.008 minutes=2214 grams/minute
11. Determine the feed flow rate for each sieve size. Example for 37 micron sieve = 9 grams/minute + 2214 grams/minute = 2223 grams/minute
12. Calculate the percent of discard solids for each sieve size. Example for 37 micron sieve=(8.80 grams/minute / 2223 grams/minute)*100=0.40%
13. Plot the sieve sizes versus the percent discard  