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The costs for supervisor labor is estimated at 15% of the operator labor cost, as shown below: Supervisor Labor Cost ο½ 0.15 ο΄ $14,839 / year ο½ $2,226 / year Maintenance Costs: The maintenance costs are the sum of the costs of labor and materials. The maintenance labor is estimated to be 0.5 hours/shift. Since the maintenance labor rate is unknown, we estimate the wage rate at 110% of the operating labor rate, as recommended in Section 1 of the Cost Manual. The maintenance labor costs are calculated as follows: πππππ‘ππππππ πΏππππ πΆππ π‘ = 0.5 hππ’ππ Γ 3 π hπππ‘π Γ 360 πππ¦π Γ $27.48 Γ 1.10 = $16,323 π hπππ‘ πππ¦ π¦πππ hππ’π Finally, for the maintenance materials, we estimated the materials to be an amount equal to the estimated maintenance labor. Carbon Replacement Costs: As discussed in Section 1.8.1.4, costs for replacing the carbon are the sum of the labor and the replacement carbon. Because the economic life of the carbon is 5 years, the carbon replacement costs must be calculated separately from the rest of the adsorber system using a capital recovery factor based on 5 years, instead of the 15-year life expected for the absorber vessels and auxiliary equipment. Hence, the costs of replacing the carbon is calculated using equation 1.36. CRCc ο½CRFcο¨1.08Ccο«Cclο© Where CRFc, calculated as follows using a 5% interest rate and 5-year carbon life, is given by: πΆπ πΉ = i(1+π)π = (0.05)(1+0.05)5 = 0.2310 (1+π)πβ1 (1+0.05)5 The labor costs for removing the spent carbon from vessels and replacing it with virgin or regenerated carbon is calculated using equation 1.37. For this example, we used the default factor of 379 lbs/hour for the carbon replacement rate (CRR) and labor rate of $30.23/hour (110% of the operator rate): πΆππ = πΏπ Γ ππ = ($30.23 Γ(10,800πππ ) = $861 πΆπ π 379πππ /hππ’π Hence, the total costs for carbon replacement are calculated as follows using the values of CRFc, Cc and Ccl calculated above: CRCc ο½CFRcο¨1.08Cc ο«Ccl ο©ο½0.2310οο¨1.08ο©ο¨$45,360ο©ο«$861οο½$11,515 Utility Costs: Electricity includes the power for the system fan, bed drying/cooling fan, and the cooling water pump. Since the solvent pump motor is normally very small, its power consumption is negligible and may be neglected. 1-40PDF Image | Carbon Adsorbers
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