COST CALCULATION OF THERMAL RECLAIMED SAND

1. Direct costs involved

PROPANE GAS COST CALCULATION

Density of Propane in liquid phase = 528 kg/m3
Liquid/gas equivalent (1.013 bar and 15°C) = 311 vol / vol
Rfd from the std properties of propane gas
Conversion of Propane from liquid to gas

1 m3 of gas = 1000/311
= 3.2154 litters of Propane
Cost of Propane gas =1.65 Dhs /litters
Average gas consumption per ton of Sand = 6 m3
Gas cost per Ton of sand = 6 x 1.65 x 3.2154 = 31.83 Dhs

Additive Cost calculation:
Additive cost per Ton = Dhs 3080
Additive cost per kg = Dhs. 3.08
Additive consumption per Ton of sand = 12 kgs.
Additive Cost per ton of sand = 12 X 3.08 = Dhs. 36.96

Power cost calculation:
Power consumption per Ton of sand= 8KWH
Power cost per unit = 0.2 Dhr / KWH
Cost of energy = 1.6 Dhr / Ton of sand
Water Cost:
Water cost=0.228 Dhr /Ton @ 100 gallon per day

Depreciation Cost:
Machine depreciation 1734500 Dhr
Depreciation cost per ton=17.345 Dhr estimating life of 10 years and 900 ton monthly production
Man Power Cost
Two additional Man Power for thermal plant = Dhs. 2000 /month
=2.22 Dhr/T
Material Handling:
Bobcat handling cost=0.3 Dhs/T
Compressed air cost:
Cost of compressed air per Ton of sand=0.5 Dhr

Total cost of thermal reclaimed sand =31.83+36.96+1.6+.228+17.34+2.22+0.3+0.5= 90.98 dhs/Ton

Actual cost of New Sand =195 dhs /Ton










2.Indirect benefits involved
a) Forklift usage for sand unloading from container
· Average 3 hrs a trip and 3 trips in every week and 12 trips in every month.
· Total Forklift usage appox. 9 hrs weekly. Therefore appox. 36 hours monthly.
· Total cost involved = 36 X 50 Dhs = Dhs.1800 /month

b) Big shovel usage to clean the k/o sand
· Average of 12 hrs weekly, therefore total of 48 hrs per month.
· Cost per hour of Shovel hire = Dhs. 100
· Total cost involved = 48 X 100 Dhs = Dhs.4800 /month

3. Cleanliness of the plant
· Since the sand was removed regularly (daily) from the k/o area, the plant front appears very clean.
· The sand disposal problem was nullified.
· Eco-friendly clean environment.