Page 93 - Chemical process engineering design and economics

78 Chapter 2

Eductor-Mixer

The cost of the mixer is given as $1000 FOB - mid-1998. No inflation or size
correction is required.

C PBi= $1,000

C PAi = 1.1 (1.0) (1.0) (1.0) (1,000) = $1,100

From Table 2.8, the direct-cost factor for miscellaneous equipment for carbon
steel is 2.0.

= 2.0(1.34)(1.18) = 3.162
f u
Installed Cost

Equation 2.15.5 gives the total installed cost for all major equipment at actual
process conditions. As Figure 2.4.1 shows, there are two reactors and two air cool-
ers. Add all installed costs for the equipment at actual conditions.

CM = 2.056 (137,200) + 2 (3.162) (6,724) + 3.162 (2101) + 3.162 (6,271) + 2
(3.953) (9,613) + 4.427 (8,628) + 3.162 (1,100) = $468,800

Equation 2.15.6 gives the total installed cost for all major equipment at the
base conditions. Add all installed costs for the equipment at the base conditions.

CBI = 2.056 (114,400) + 2 (3.162) (7,004) + 3.162 (2,387) + 3.162 (7,456) + 2
(3.953) (12,930) + 4.427 (7,844) + 3.162 (1,000) = $417,600

We see that the cost of the installation at ordinary process conditions, C Bi, is
less than the cost at actual conditions, C AJ. If this process were a grass-roots plant,
we would have to add the additional cost of buildings and auxiliary facilities. In
this case, the process is a plant addition at an existing site where the buildings and
auxiliary facilities are available. Therefore, fAB = 0, as given in Equation 8.15.8.
Thus, the depreciable capital cost is equal to $468,800.

The fix capital cost equals the sum of the depreciable capital cost, land cost,
and site development cost. Because this process will be built at an existing site, the
land cost is not a consideration. Table 2.17 lists site-development factors for a
plant at an existing site. For a fluid processing plant, the factor is 0.0211. Thus, the
fixed capital cost,

C F = 468,800 + 0.0211 (468,800) = $478,700

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