Page 294 - Chemical engineering design

COSTING AND PROJECT EVALUATION
Total purchase cost of major equipment items (PCE)
Absorption column 29,000 269
Recovery column 64,000
Reboiler 8000
Condenser 6000
Cooler 3000
Solvent tank 10,000
Product tank 10,000
Total £130,000

Estimation of fixed capital cost, reference Table 6.1, fluids processing plant:
PCE £130,000
f 1 Equipment erection 0.40
f 2 Piping 0.70
f 3 Instrumentation 0.20
f 4 Electrical 0.10
f 5 Buildings none required
f 6 Utilities not applicable
f 7 Storages provided in PCE
f 8 Site development not applicable
f 9 Ancillary buildings none required
Total physical plant cost PPC D 132,300 1 C 0.4 C 0.7 C 0.2 C 0.1 D £317,520

f 10 Design and Engineering 0.30
f 11 Contractor’s Fee none (unlikely to be used for a small, plant project)
f 12 Contingencies 0.10
Fixed capital D 317,520 1 C 0.3 C 0.1 D 44,528 round up to £445,000

Working capital, allow 5% of fixed capital to cover the cost of the initial solvent charge D
445,000 ð 0.05 D £22,250.
Total investment required for project D 445,000 C 22,250 D 467,250, say £468,000

Annual operating costs, reference Table 6.6:
Operating time, allowing for plant attainment D 365 ð 0.95 D 347 d/y, 347 ð 24 D
8328 h/y.

Variable costs:
1. Raw materials, solvent make-up D 10 ð 347 ð 400/1000 D £ 1388
2. Miscellaneous materials, 10% of maintenance cost (item 5) D £ 2200
3. Utilities, cost from Table 6.5:
Steam, at 7£/t D 7 ð 8328 ð 200/1000 D £11,659
Cooling water, at 1.5 p/t D 1.5/100 ð 8328 ð 5000/1000 D £ 625
Power, at 1.2 p/MJ D 1.2/100 ð 360 ð 347 D £ 1499
4. Shipping and packaging not applicable
Variable costs D £17,371