Trays costs

Figure B-8 Tray costs for distillation columns. (Use vertical vessel charts for shell.)...

Fd Design-type factor in tray-cost determination. 

Summing the shell cost, the tray cost, the cost of accessories and the cost of the cooling circuit, the total cost is USS367 500. 

The most common vertical vessel internals are trays or packing. Tray cost increases considerably with increase in column diameter. Packing likewise increases with column diameter increase, due to column volume increase. (See Tables 8.19 to 8.21.)... 

Figure 8.7 Fractionation tray cost (shop-installed),, base tray cost x (F. + F. + FJx escalation index. Add this tray cost to the vertical vessel s overall module cost.

TABLE 8.19 Fractionation Column Tray Cost, Fs Factor... 

TABLE 8.22 Vertical Pressure Vessel Module Associated Cost Factor Additions, in Percent (total module cost = base cost x total modular factor + tray cost)... 

Tray costs are shown in Fig. 16-26 for conventional installations. The approximate prices for various types and sizes of the most common industrial packings are indicated in Table 7. Costs for other packing materials are listed in Table 8. For rough estimates, the cost for a distributor plate in a packed tower can be assumed to be the same as that for one bubble-cap tray. 

Transmittal, letter of in reports, 455, 457 Trays, cost of 709 (See also specific type of trays)... 

Sometimes for large liquid rates, the downcomer skirt clearance is increased by recessing the bottom end of the downcomer into a sump built into the tray floor. Such a sump increases tray cost and may trap debris. 

At the present time, valve trays constitute about 70 percent of the market, sieve trays 25 percent, and bubble-cap trays 5 percent. The standard valve tray costs about 20 percent more than the standard sieve tray with - to -inch or larger holes. The cost of a bubble-cap tray is approximately 300 percent more than the corresponding valve tray. 

The bare-module cost of the tower vessel is estimated to be 1,480,000 and the accompanying tray cost is 120,000, giving a total bare-module cost for the colunm of 1,600,000. The bare-module costs for the colunm auxiliaries are computed to be... 

The Marshall and Stevens equipment cost index or the Chemical Engineering magazine plant cost index are usually used. Current values are given in each issue of Chemical Engineering magazine. Values for several years cost indices are tabulated in Table 11-1. The total uninstalled equipment cost will be the sum of condenser, reboiler, tower casing, and tray costs. The total capital cost is then found from Eq. (11-1). The capital cost per year equals the capital cost times the depreciation rate. Note that cost estimates can easily vary by up to 35%. 

Sieve and valve tray and packing costs do not depend direcdy on pressure although they depend indirecdy on pressure since column diameter depends on pressure. Sieve tray costs depend on the number of trays ordered through the quantity factor Fq, which can be calculated from the following equation tTurton et al.. 

Al. If valve trays cost more than sieve trays, why are they often advertised as a way of decreasing tower costs ... 

By refering to the column datasheets, column height is about 93.33 ft and column diameter is equal to 12.33 ft, from Seider equation 16.66 and by actualizing prices to 2010, the final tray cost is 381,590. 

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