Page 262 - Air Pollution Control Engineering

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Wet and Dry Scrubbing 241

ASC = (USC)(ASR) (27)
7
ASC = (0.20/1000)(1.26 × 10 ) = $2,520
3. Annual operating labor costs are estimated by assuming that for every 8-h shift the
scrubbing system is operated, 0.5 h are required to maintain the wet scrubber. With
labor cost at $12.96/h (see Table 7),
Annual operating labor hours = (0.5 h/shift)(3 shifts/d)(5 d/wk) (50 wk/yr)
Annual operating labor hours = 375 h/yr
Annual operating labor cost = (375 h/yr)($12.96 /h) = $4,860/yr
Supervisor labor cost is estimated at 15% of operator labor cost (see Table 7):
Annual supervisor labor cost = (15%)(annual operator labor cost)
Annual supervisor labor cost = (0.15)($4,860) = $729/yr

4. The annual maintenance labor cost is estimated by assuming that for every 8-h shift
the scrubbing system is operated, 0.5 h are required to maintain the wet scrubber.
The maintenance labor cost is based on rate of $14.26 per hour. This cost for this
example is determined as follows:
Annual maintenance labor hours = (0.5 h/shift)(3 shifts/d)(5 day/wk)(50 wk/yr)
Annual maintenance labor hours = 375 h/yr
Annual maintenance labor cost = (375 h/yr) ($14.26/h) = $5,350

5. Annual Maintenance Materials Cost
The maintenance material cost is estimated by assuming it is equivalent to 100%
maintenance labor cost. This cost for this example is determined as follows:

Annual maintenance materials cost = (100%)(annual maintenance labor cost)
Annual maintenance materials cost = (1.0)($5,350) = $5,350/yr

6. The total direct annual costs is the summation of direct costs:

AEC = $2,340
ASC = $2,520
Annual operating labor cost = $4,860
Annual supervisor labor cost = $729
Annual maintenance cost = $5,350
Annual maintenance materials cost = $5,350
Total Annual Direct Cost = $21,100

C. Indirect Annual Costs
Table 7 lists indirect cost factors. These factors are utilized to determine indirect annu-
al costs (ICA) for this example as follows:

Overhead = 0.60(annual operating labor and maintenance costs)
Overhead = 0.60($4,860 + $729 + $5,350 + 5,350) = $9,770
Property tax = 0.01(TCC)
Property tax = 0.01($100,000) = $1,000
Insurance = 0.01(TCC)
Insurance = 0.01($100,000) = $1,000
Administration = 0.02(TCC)
Administration = 0.02($100,000) = $2,000