Page 90 - Chemical process engineering design and economics

Production and Capital Cost Estimation 75

Chlorinators

Because there appears to be no cost data for chlorinators, we will approxi-
mate the cost by using a fixed-tube, shell-and-tube heat exchanger. From Table
2.9, the cost of a 1,000 ft 2 floating-head heat exchanger in January 1990 was
2
$14,000. As indicated in Table 2.4.1, each chlorinator requires 330 ft of surface
area.
The cost of a chlorinator in January 1990 was

( 330 V' 65
CpB2i= 14,000 ——— | =$6,810
I 1.000J

To obtain the January 1990 cost index, interpolate between 1989 and 1990,
the mid-year indexes for heat exchangers given in Table 2.12. The cost of the
chlorinator in mid-1998,

382.8
C PBi = 6810 ——— =$7,004
372.2

Table 2.11 contains correction factors for pressure, material-of-construction,
and design. Table 2.10 contains the correction factor for temperature. Thus, the
cost of the chlorinator at design conditions from Equation 2.15.3 is,

C PAi = 1.2 (0 + 0.8) (1.0) (7004) = $6,724

Table 2.8 does not contain a direct-cost factor for a CS/CS heat exchanger.
Use 2.0, which is close to other factors for shell-and-tube heat exchangers. Again,
the indirect-cost factor is 1.34, and the factor for contingency and contractor's fee
is 1.18. Thus, the installation factor for the chlorinator,

f, 1 = 2.0(1.34) (1.18) = 3.162

Dowtherm Cooler

The installed-cost calculation for the Dowtherm cooler follows the same procedure
as the calculation for the chlorinator.

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