M S index

The accuracy of such cost extrapolation tends to decrease with the length of time involved. Various important U.S. cost indexes are the M S Index, CE Plant Cost Index, Nelson Constmction Cost Index, and the ENR Constmction Index. Similar indexes are available for other countries. 

In order to update the cost of the exchanger, we use the M S index whose value in 1992 and 1996 was 943 and 1,039, respectively (see Chemical Engineering magazine). Therefore, Eq. (III.l) may be used to give the 1996 cost of the 100 wr shell-and-tube heat exchanger to be... 

The ratio method is a simple technique whereby known capital cost data for an existing chemical plant are adjusted to provide a cost estimate for the desired plant capacity. This method is also able to update figures to account for inflationary effects of past years. Finally the capital cost figure is adjusted for exchange rate differences between countries. The method is centred around the use of key cost estimation indices such as the CE Plant Cost Index and the Marshall and Stevens (M S) Index. 

Estimate the fob purchased cost of a stainless steel pulse column when the Marshall Swift (M S) index is 1200. The column is 30 ft high and 2 ft in diameter. Internals are estimated as sieve trays with 1.5-ft spacing. 

M S index was 1095 for mid 2002. Table 15.8 gives some values, while Fig. 15.4 gives the trend over the last 13 years, together with linear and quadratic regression equations. value closer to one indicates a better correlation. Although quadratic ... 

M S Index at updated time M S Index at the time of original cost... 

The M S Index and the CE Index can also be used for world-price comparison, if the changes in costs according to the local economics, type of industry, and kind of equipment (besides time) are accounted for [19]. 

C is the installed cost (US in the year of the M S Index) covering the dryer and auxiliaries, including foundations and erection, but no secondary dust collectors or building... 

This relation, however, does not reflect the material properties, so the calculated prices are underestimated. The graphs according to Equation 65.3 are presented in Figure 65.2 for the M S Index equal to 1100. 

FIGURE 65.2 The dependence of dryer cost on evaporation capacity in kg moisture/h and inlet-air temperature in °C, according to Equation 65.3 (M S Index = 1100). 

The fabrication cost of a drying unit besides its size depends also on the material of construction it is the lowest for carbon steel. If the process requires a more chemical-resistant material, a cladding may be applied in some cases. In certain drying operations, optimum design of the equipment as well as product-quality requirements calls for the use of not only more durable but also more expensive materials. In general, drying equipment built of 304-stainless steel typically costs from 1.5 to 1.7 times more than that made of carbon steel and 2-3 times more if built of titanium. The cost depends also on the auxiliary equipment, and this is a reason for some uncertainty in cost prediction from literature sources without vendors data. Figure 65.3 presents, as an example, the purchase cost for several dryers in relation to their capacity that is updated to the year 2000 with the M S Index equal to 1089. 

Solution Based on the data presented in Table 65.1, the M S Index and the CE Index in the year 2006 are predicted by linear extrapolation, as shown in Figure 65.6. The values of the indices are ... 

FIGURE 65.6 Trends in the M S Index (left scale) and the CE Index (right scale) in the years 1989-2004 with extrapolation to the... 

Year M S Index CE Index Year M S Index CE Inflex... 

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