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A red-line drawings is essentially an intermediate drawing that shows corrections or changes to a previous drawing. The term red line literally comes from the (typically) red pen used to amend the drawings by hand. These changes mark-ups show changes made to the drawing subject matter during the manufacturer or construction of the product. For example, piping drawings were developed at the onset of a project to build a new school. During the course of construction for that school, the piping contractors changes several elements of the design (pipe size, routing, orientation etc). At the end of the project, the constructor would "red line" the drawings showing those changes. Red-lines are used to then develop record drawings. Record drawings, also called "as-built" accurately reflect what was constructed and are used for future work and/or reference.
I think first of all we can not think of red lines per say and need to understand what red lines mean... I personally always used red and special characters to identify this area ... I have used red lines in As_build to identify the changed areas and the number identifies how many changes been made ....
I do not think I have been drawing them in different colors, however I have been putting them on its own layer/level and I have used different symbolism to identify them ...
It is also not recommended to draw them in any other color...
Red-Line meaning is to mark a drawing or document for correction or modification with the frequent use of red pen or pencil .
As is traditional, we still make red-line markups to drawings (or specifications) to relate our suggested needed changes. These inputs are reported to the client at the conclusion of our package analysis, and/or in rapid response to emerging new design inputs or requirements.
Red-line comments may be made in brief to note, or made in high-detail to explain, the specific deficiencies, errors, or ambiguities we may find on design documentation. These are typically provided "red-lined" on to the document itself, or may be detailed out separately in an addendum.
Complete answer given by Elke woofter, i appreciate her efforts.
