Chemical Process Design
Chemical Process Design
Chemical Process Design
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Categories of total capital cost estimates<br />
based on accuracy of the estimate<br />
ESTIMATE BASED ON Error (%) Obtention USED TO<br />
ORDER OF<br />
MAGNITUDE<br />
(Ratio estimate)<br />
STUDY<br />
PRELIMINARY<br />
DEFINITIVE<br />
Method of Hill, 1956. Production rate<br />
and PFD with compressors, reactors<br />
and separation equipments. Based<br />
on similar plants.<br />
Overall Factor Method of Lang, 1947.<br />
Mass & energy balance and<br />
equipment sizing.<br />
Individual Factors Method of Guthrie,<br />
1969, 1974. Mass & energy balance,<br />
equipment sizing, construction<br />
materials and P&ID. Enough data to<br />
budget estimation.<br />
Full data but before drawings and<br />
specifications.<br />
40 - 50 Very fast Profitability<br />
analysis<br />
25 - 40 Fast<br />
15 - 25 Medium<br />
10 -15 Slow<br />
DETAILED Detailed Engineering 5 -10 Very slow<br />
Preliminary<br />
design<br />
Budget<br />
approval<br />
Construction<br />
control<br />
Turnkey<br />
contract<br />
4
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