Plot plans equipment location

Figure 7-6 shows a plan of the feed gas compressor area for a 200,000 tons per year ethylene unit. Main pipe runs are also shown. It is an In-Line-Layout with equipment in process flow sequence. The large diameter gas lines directly interconnect process equipment. On the complete plot plan, equipment (including compressors) is arranged on both sides of a central yard in process flow sequence. Pumps are located at their point of suction and are lined up under the yard. A parallel road is arranged to every line of equipment for convenient construction and maintenance access. 

Liston (Ref. 27) provides useful checklists for equipment and building siting and layout for safety purposes, as well as other safety-related criteria for plant design. These checklists address economic considerations and facility geographical location, site selection, layout, and unit plot planning factors. 

Plot Plan. The relationship between plant units, equipment, buildings and yard piping is shown on the plot plan. Positions of incoming and outgoing lines can be seen. Major structures, location of buildings and all equipment is shown. Roads crossing the yard or located under the yard steel are indicated. 

The layout of the various sewer systems can begin with a careful indication of all the major equipment foundations, the locations of which are taken from the plot plan. Care should be exercised to indicate all pipe rack columns, lighting poles and all minor footings, which, if not shown, may result in interferences with the sewers. Underground cooling-water systems should be integrated into the sewer system layout as an additional system as it would be impossible to avoid interferences. The same can be said of any underground electrical utilities they must be also indicated on the sewer layout to avoid any interferences. 

Plot plans showing the locations of electrical equipment. 

Plot plan layout indicating location of vessels, occupied buildings and equipment... 

As a starting point, a plot plan of the site should be prepared showing the locations of existing structures, property lines, entrances, exits, fire hydrants, sprinkler systems, emergency equipment, plant controls and shutoffs, and areas where specific hazardous materials are handled or stored. 

After contraa award, the proposal plot plan is updated to suit the latest information and is reviewed and approved by the client. This document becomes the basis for the plant layout phase of the projea and is called the planning plot plan. A sample planning plot plan is shown in Exhibit 3-2. On completion of the plant layout phase—when all the equipment has been sized and is in the best position to suit the projea requirements and when all access roads, buildings, and pipe tacks have been located—the plot plan is finally issued for construction. Ihis is illustrated in Exhibit 3-3 as the construaion plot plan. 

This chapter has highlighted some of the principal features involved in the arrangement of process equipment with regard to operation, maintenance, constructibility, safety, and economics. Subsequetii chapters deal with the needs of each equipment item in more detail, thereby offering greater insight to proper equipment location on a plot plan. 

The initial layout of any oily or storm water underground piping system usually takes place after the preliminary plot plan is generated. Even though some equipment locations may be tentative, the plant layout designer can begin to spot the oily water and storm water mains, locate sewer boxes, and establish the invert elevation of these systems at each end of the unit. 

The sizing of process equipment should be conpleted and the approximate location on the plot plan determined. Referring to Table B.1.3 for equipment specifications gives some idea of key equipment sizes. For example, the data given for the reflux drums V-202 and V-203, reactor R-201, and towers T-201 and T-202 are sufficient to sketch these units on the plot plan. However, punp sizes must be obtained from vendors or previous jobs, and additional calculations for heat exchangers must be done to estimate their required footprint on the plot plan. Calculations to illustrate the estimation of equipment footprints are given in Example 1.11. 

---