Natural Gas Processing

15.18. Equipment indication

15.18.1. Vessels, towers, drums

The following requirements shall be shown:

• changes of shell diameter (if any);

• top and bottom trays, and those trays that are necessary to locate feed, reflux, and product lines;

• all draw-off trays with tray number and diagrammatic representation of the downcomer position (e.g. side or center);

• all nozzles, manholes, instrument connections, drains, vents, pump-out and steam-out connections, blank-off ventilations, vortex breakers, safety/relief valve connections, sample connections, and handholds;

• skirt or legs, top and bottom tangent lines;

• elevations above base line to bottom tangent line of column or to bottom of horizontal drum;

• the position of high high liquid level (HHLL), ...