DRAWING SYMBOLS

DRAWING SYMBOLS Because of the small scale used in most drawings, standard graphic symbols are used to present complete information concerning con- struction items and materials. These typical symbols are used so frequently in construction drawings that their meanings must be familiar not only to the preparer, but to the user as well. The main information sources for a particular symbol are the Military (Drawing) Standards (MIL-STD) and the American National Standards Institute (ANSI). Refer to these standards before you use other references. Listed below are some of the most commonly used military standards and the particular symbols they carry. Standard Description MIL-STD-14 Architectural Symbols (latest revision) MIL-STD-17-1 Mechanical Symbols (latest revision) MIL-STD-18 ANSI Y32.9-1972 Structural Symbols (latest revision) Graphic Symbols for Electrical Wiring and Layout Diagrams Used in Architecture and Building Construction ANSI Y32.4-1977 Graphic Symbols for Plumbing Fixtures for Diagrams Used in Architecture and Building Con- struction ANSI/AWS A2.4-1986 Symbols for Welding Sometimes you may notice that other sym- bols are not included in any of the standards mentioned earlier. These symbols, like the ones shown in figure 10-6, can be found in one of the military handbooks developed by NAV- FACENGCOM for project drawings. As an EA, you will find that your knowledge of applicable symbols will greatly assist you in accomplishing the job correctly and promptly, and, above all, with confidence. Some of the basic architectural and welding symbols are shown in figures 10-7 through 10-10. Other types of symbols are shown in the appendix section of this book. DRAWING NOTES NOTES are brief, clear, and explicit statements regarding material use and finish and Figure 10-6.-Symbols used to identjfy sections, elevations, and details. construction methods. Notes in a construction drawing are classified as specific and general. SPECIFIC notes are used either to reflect dimensioning information on the drawing or to be explanatory. As a means of saving space, many of the terms used in this type of notes are often expressed as abbreviations. GENERAL notes refer to all of the notes on the drawing not accompanied by a leader and an arrowhead. As used in this book, general notes for a set of drawings covering one particular type of work are placed on the first sheet of the set. They should be placed a minimum of 3 in. below the space provided for the revision block when the conventional horizontal title block is used. When the vertical title block is used, you may place the general notes on the right side of the drawing. General notes for architectural and structural drawings may include, when applicable, 10-9