Chemical Engineering Plant Economics
Chemical engineering plant cost index is used for finding the present cost of a particular chemical plant, if the cost of similar plant at some time in the past is known. The present cost of the plant = original cost x (index value/(index value at original cost was obtained) The most major component of this cost index is

Process instruments and control
Fabricated equipment and machinery
Pumps and compressor
Electrical equipments and material

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Chemical Engineering Plant Economics
The depreciation during the year 'n', in diminishing balance method of depreciation calculation, is calculated by multiplying a fixed percentage 'N' to the

Initial cost
Depreciation during the (n - 1)th year
Difference between initial cost and salvage value
Book value at the end of (n - 1)th year

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