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122 José Renato Coury et al.

Table 9
CE Equipment Index
Date Index Date Index Date Index
Feb. 1990 389.0 May 1988 369.5 Aug. 1986 334.6
Jan. 1990 388.8 Apr. 1988 369.4 July 1986 334.6
Dec. 1990 390.9 Mar. 1988 364.0 June 1986 333.4
Nov. 1989 391.8 Feb. 1988 363.7 May 1986 334.2
Oct. 1989 392.6 Jan. 1988 362.8 Apr. 1986 334.4
Sept. 1990 392.1 Dec. 1987 357.2 Mar. 1986 336.9
Aug. 1989 392.4 Nov. 1987 353.8 Feb. 1986 338.1
July 1989 392.8 Oct. 1987 352.2 Jan. 1986 345.3
June 1989 392.4 Sept. 1987 343.8 Dec. 1985 348.1
May 1989 391.9 Aug. 1987 344.7 Nov. 1985 347.5
Apr. 1989 391.0 July 1987 343.9 Oct. 1985 347.5
Mar. 1989 390.7 June 1987 340.4 Sept. 1985 347.2
Feb. 1989 387.7 May 1987 340.0 Aug. 1985 346.7
Jan. 1989 386.0 Apr. 1987 338.3 July 1985 347.2
Dec. 1988 383.2 Mar. 1987 337.9 June 1985 347.0
Noc. 1988 380.7 Feb. 1987 336.9 May 1985 347.6
Oct. 1988 379.6 Jan. 1987 336.0 Apr. 1985 347.6
Sept. 1988 379.5 Dec. 1986 335.7 Mar. 1985 346.9
Aug. 1988 376.3 Nov. 1986 335.6 Feb. 1985 346.8
July 1988 374.2 Oct. 1986 335.8 Jan. 1985 346.5
June 1988 371.6 Sept. 1986 336.6 Dec. 1984 346.0
Source: ref. 33.

control equipment. These costs must be estimated before the purchase equipment cost
(PCE) can be calculated. Costs for auxiliary equipment were obtained from ref. 31.
If the equipment costs must be escalated to the current year, the Chemical
Engineering (CE) equipment index can be used (33). Monthly indices for 5 yr are pro-
vided in Table 9.
The following equation can be used for converting the past cost to the future cost or
vice versa.

cost = cost a (index b ) (57)
b
(index a )
where cost is the cost in the month–year of a (US$), cost is the cost in the month–year
a b
of b (US$), index is the CE equipment cost index in the month–year of a, and index
a b
is the CE equipment cost index in the month–year of b. It should be noted that although
the CE equipment cost indices are recommended here for index and index , the ENR
a b
cost indices (34) can also be adopted for updating the costs.

3.7. Cost Estimation Examples
Example 3
3
Assume an emission stream actual flow rate of 1000 acfm, a particle density of 30 lb /ft ,
m
3
an emission stream density of 0.07 lb /ft , an emission stream viscosity of 1.41×10 −5
m