Discounted Cash Flow Analysis to Select Equipment

by Richard Briller, (A.M.ASCE), Pres.; Entech Corp., Dumont, N.J.,

Serial Information: Journal of the Environmental Engineering Division, 1976, Vol. 102, Issue 3, Pg. 595-611

Document Type: Journal Paper

Discussion: Wester Thomas E. (See full record)
Discussion: Henry Douglas Paul (See full record)


Recent interest in cost effectiveness has led to greater consideration of total overall (capital and operating) costs of equipment. A discounted cash flow analysis (DCFA) method is developed to compare total overall costs of competing equipment. An example using the technique for surface aerators in a municipal treatment plant is presented. The results show that small differences in operating efficiency are highly significant for equipment with high operation cost compared to initial cost. A sensitivity analysis is performed for the example to show the most significant variables. The general use of the DCFA method and sensitivity analysis to similarly structured problems is exemplified. Practical suggestions are given for specification writing for competitive bidding using DCFA. Considerable savings can be realized using this technique to select equipment.

Subject Headings: Financial management | Equipment and machinery | Sensitivity analysis | Structural analysis | Writing skills | Assets | Local government | Aeration

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