Yard in Elevation

Generally, those process lines should be located in the top bank which interconnect two nozzles elevated higher than the top yard bank. Process lines with one end lower than the bottom yard elevation can run either in the top or the bottom bank. If both ends of a process line are lower than the bottom yard elevation, the line should be located in the bottom bank. 

The elevation of a line can also be influenced by valves and instruments in the line. Often a more convenient access platform can be provided for valves arranged in the top yard bank. The preferred location of lines Avith orifice runs is near the edge of the yard with orifice flanges near a yard column, for more convenient portable ladder access. 

Dead end yard. Lines enter and leave one end of yard. 

Straight through yard. Lines can enter and leave both ends of the yard. 

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