READING A CONSTRUCTION DRAWING
1. A plumber has to read and understand the information on a construction drawing. The drawing has two areas, the legend and the diagram. The legend contains general information and the scale of the drawing. The diagram contains plumbing symbols giving the location of the plumbing system in a building.
a. General information is in the legend of a construction drawing. "Schedule of Drawings," part of a legend in figure 1-1, identifies all the drawings by number, number of sheets per drawing, and title of each drawing. "General Notes," also part of a legend in figure 1-1, gives additional information that is needed. Items 3, 4, and 5 are for the plumber. Note: The legend of a construction drawing is in the lower right hand corner.
FIGURE 1-1. INFORMATION IN A LEGEND
b. The scale of a drawing can be either a graphic or ratio scale. In figure 1-2, each segment of the line equals one foot in the building. In figure 1-3, 1/4 inch on the drawing equals one foot in the building.
FIGURE 1-2. LEGEND, GRAPHIC SCALE
FIGURE 1-3. LEGEND, RATIO SCALE
2. The diagram is the part of the drawing that uses symbols to show the location of the water system, waste system, and fixtures. See figure 1-4.
FIGURE 1-4. CONSTRUCION DRAWING DIAGRAM
|David L. Heiserman, Editor||
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Revised: June 06, 2015