Boiler sizes for the model mills are based on estimated steam re- 

 quirements, most of which are for pelleting, and vary from 20 h.p. for 

 Mill A to 300 h.p. for Mill F. 



Miscellaneous equipment includes items not assignable to any of 

 the other categories, such as fat pumping and straining equipment, fat 

 tanks, air compressors, remote motor control equipment, indicators for 

 bins, and so on. 



The investment in equipment includes not only the purchase price, 

 but the installation charges for placing the equipment in operational 

 status. These charges include costs for wiring, mechanical installation, 

 and plumbing of fat, steam, and air lines throughout the mill. Installa- 

 tion costs are equivalent to between 40 and 50 percent of the equipment 

 purchase price. 



The total investment for equipment — purchase price plus installa- 

 tion — varies from $52,627 for Mill A to $508,456 for Mill F. Total in- 

 vestment, however, does not increase in proportion to increases in capa- 

 city. Investment per ton of annual capacity decreases from $9.68 for Mill 

 A to $5.61 for MiU F. 



2. Mill Building — A number of variables determine the construc- 

 tion cost of buildings. The major ones are: location with reference to 

 transportation, topography and soil conditions of the site, type and size 

 of building constructed, building materials used, and building code re- 

 quirements. All model mills are assumed to be located on level sites in 

 close proximity to a railroad and highway, with soil conditions satis- 

 factory to support buildings with concrete footings, thus eliminating the 

 need and expense of piling. All buildings are constructed with a steel 

 frame and metal sheathing with no consideration given for future ex- 

 pansion. 



The mill building is high in relation to its width and length. This 

 type of construction permits use of gravity as much as possible to move 

 materials. Much of the cubic volume of the mill building above the first 

 floor consists of working bins for storage of ingredients. 



The basement of each mill contains the receiving cleaning shoe, 

 hammermills, fat tanks and pumps. In Mills B' through F, the horizontal 

 mixers, surge bins, vertical pellet coolers, and necessary conveyors are 

 also located in the basement. 



The first floor area holds various kinds of equipment depending on 

 the size of the mill, technology adopted, and physical layout. For Mill A 

 the vertical mixer, a unit that contains the pellet mill, cooler, crumb- 

 ilizer, and grading shoe, and the fat application equipment are located 

 on the first floor. In Mills A' and B, only the vertical mixers, pellet 

 coolers, and fat application equipment are located on the first floor. The 

 first floor in Mills B' through F holds the weighing and proportioning 

 equipment, control centers, and pellet mills. 



The upper floors of each mill are constructed next to the ingredient 

 holding bin cluster. On these floors are located the mash feed condition- 

 ers for all mills, the pellet mills for Mills A' and B, the crumbilizers and 

 grading shoes for Mills A' through F, and the fat application equipment 

 for Mills B' through F. Also on these floors are the bins for holding 

 mash feed for pelleting and for holding pellets or crumbles for fat appli- 

 cation. 



17 



