Layout yard piping

The plant layout determines the main yard piping runs. Fig. 7-53 shows yard piping layouts resulting from various plant arrangements. Smaller plants have usually the simplest yard piping as shown on sketches A and B. On sketch A, process... 

Figure 7-56 also shows those critical dimensions which will influence piping cost from a yard piping layout standpoint. These dimensions depend on... 

If, with good layout practices, the same number and size of equipment can be arranged on a shorter yard length, yard piping cost can be reduced... 

Figure 7-60. In this example of yard piping layout, notice how the elevations have been governed by headroom requirements over the North-South road. The elevation also sets the height of the first platform of the exchanger supporting structure.

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. 

The over-all plant layout already influences the main arrangement of exchanger piping and the necessary access (see Figure 7-70). The channel end of exchangers face the main plant access for convenient tube removal. The shell cover faces the yard and should be as close to the yard steel as practically possible (usually 6 to 7 feet from column center to outside of shell cover). 

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