Structure-mounted vertical arrangement

Plot plans are often referred to by their process (e.g., an ammonia plant or hydrotreater unit) rather than by the type of configuration of the equipment layout. In terms of equipment arrangement, process unit plot plans can basi Iy be divided into two configurations the grade-mounted horizontal inline arrangement seen in most refinery facilities, and the structure-mounted vertical arrangement found in many chemical plants. 

The structure-mounted vertical arrangement has equipment located in a rectangular multilevel steel or concrete structure. The structure can be several bays long and either open-sided or fully enclosed, to suit either client preference or climate conditions. Piping... 

Figure 1.9 Different Types of Plant Layout (a) Grade-Mounted Horizontal Inline Arrangement, and (b) Structure-Mounted Vertical Arrangement (Source Process Plant Layout and Piping Design, by E. Bausbacher and R. Hunt, 1994, reprinted by permission of Pearson Education, Inc., Upper Saddle River, NJ)...

The advantages of this type of arrangement are the small amount of real estate required for the plant and the ability to house the facility to suit process requirements or climate conditions. The disadvantages are in the operator and maintenance access and in the construction of the plant. Exhibit 3-8 shows a npical structure-mounted vertical plot plan arrangement. 

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