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140 Part III: Inspection and Test
Part III.A.1
Title Block. The title block includes the border and the various sections for providing
quality, administrative and technical information. The title block includes
all the information that enables the drawing to be interpreted, identified, and
archived. The title block is usually located in the lower right corner as shown in
Figure 14.2. This block must contain the title of the project or the drawing, drawing
description, scale, name of designer and/or draftsman, and the date. It might
also contain information about the company, registration or ID number, and previous
revisions. The tile block should also include boxes for the legal signatures
of the originator and other persons involved in production of the drawing to the
required quality. The drawing sheet size should be in accordance with BS EN ISO
5457 TD Sizes and Layout of Drawing Sheets (Dirks 2000).
Notes. Notes are placed on drawings to give additional information to clarify the
objects on the blueprint. The notes area is not part of the title block. Figure 14.2
shows the placement of the title block and notes on engineering drawings. Notes
might include legends and symbols or specially marked places on the blueprint
(Dirks 2000).
Scale. The scale block in the title block of the blueprint shows the size of the drawing
compared to the actual size of the item. The scale may be shown as enlargement
or reduction of the actual size. For example, a scale of 1/100 means that one
unit on the drawing is equal to 100 units in real (actual) size. See Figure 14.3.
Revision Block. The revision block is located in the upper right corner of the blueprint
or technical drawing. All modifications to the drawing are documented in
this block. The most important modifications needed in the revision block are
the revision date, revision number, revision symbol, change description, change
authorization, and change code (MTAG 2001). See Figure 14.4.
Tolerance. ASME Y14.5, 1994 defined tolerance as “the total amount by which a specific
dimension may vary” (ASME 1994). Tolerance is the range of allowed values
that is normally specified by a certain standard. Tolerance is one of the most important
sections that appears in the engineering drawing to show the variation of
each dimension (Pyzdek 2003). The drawing will include the allowed boundaries
of a generic shape, in terms of its geometry, and of the allowed dimensional values
Notes
Drawing area
Drawing area
Title block
Figure 14.2 Placement of the title block and notes on engineering drawings.