Chemical Engineering Plant Economics
'Lang factor' is defined as the ratio of the capital investment to the delivered cost of major equipments. The value of 'Lang factor' for fixed capital investment, for a solid-fluid processing chemical plant ranges from

4.2 to 4.4
1.2 to 1.4
2.5 to 2.7
6.2 to 6.4

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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

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

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