Bare-module costs

The bare module cost of a stainless-steel tank is ... 

In 1964 the installed cost for each extruder and its accessory equipment was given as 90,000.25 The indirect costs increase the cost for solids-handling equipment an average of 29%. This gives a bare module cost of 1,180,000 for all 9 extruders and accessories in 1968. No bare module factors are given for extruders. However, an extruder is really a polymer pump, and for pumps and compressors the bare module factor is around 3.25 and the material factor for stainless steel is 2.0. A back calculation gives a 1968 F.O.B. cost of 540,000. 

To obtain bare module costs multiply by 1.29 for solids operations and 1.34 for others. 

Bare Module Costs of Single Story Building Shells... 

From the column dimensions, the bare module cost for the internals, if they are constructed of carbon steel and have 24-in spacing, would be... 

Total. The sum of items 5, 6, 8, and 9 (with an allowance for modification of the offsites as needed, item 7) is referred to as the direct or bare module costs (BM). 

The bare module cost for a carbon-steel exchanger rated at 150 psi is 23,000 X 3.39 = 78,000... 

Total bare-module costs for fabricated equipment... 

Total bare-module costs for spares Total bare-module costs for storage and surge tanks... 

Suimning the indirect module expenses ( 9,470), and combining the result with the cost of materials and labor, the bare-module cost for the 10,000 heat exchanger. Cbm. is 32,910, and, hence, the bare-module factor, is 3.291. 

Guthrie also computes and lists factors for starting with the f.o.b purchase cost and arriving at the bare-module cost. For the heat exchanger example of Table 16.10, the factors are derived as follows ... 

All of the equipment for handling solids and fluid-solids mixtures have factors less than 2.45. In Table 16.9, the sum of the bare-module costs for all items of fabricated equipment is CpE, while the sum of the bare-module costs for all items of process machinery is Cp -... 

Total bare-module cost for on-site equipment 108.83 ... 

For the ammonia process, which operates at high pressure (200 atm), mostly in the gas phase, the total f.o.b. purchase cost of the on-site process equipment is 31,520,000. Installation costs boost this amount by a factor of 3.453 to a total bare-module cost of 108,830,000. As seen in Table 16.14, this cost is dominated by the gas compressors, with significant contributions from the heat exchangers and the membrane separators. Surprisingly, the reactor cost is a small fraction of the total cost. This is often the case for chemical plants. The reactor may not cost much, but it is the heart of the process and it better produce the desired results. 

Table 16.15 continues the cost estimate to obtain the total capital investment. After all other investment costs are added to the total bare-module cost of the on-site equipment, the total capital investment becomes 179,730,000. The total permanent investment is 169,640,000, which is a factor of 5.38 times the total f.o.b purchase cost of the on-site process equipment. The start-up cost here is taken as 8% of Ctdc-... 

Step 3 Update the cost data to the current cost index. For each piece of equipment, determine the bare-module cost, using bare-module factors, Fbm, from Table 16.11, being careful to determine it properly when the material of construction is not carbon steel and/or the pressure is not near ambient, as given by Eq. (16.12) and illustrated by the following example, before moving to Step 4. As discussed earlier, the bare module cost accounts for delivery, insurance, taxes, and direct materials and labor for installation. 

Step 4 Obtain the total bare-module cost, Ctbm. by summing the bare-module costs of the process equipment. 

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