Drawings Numbering System – Part Two

In the previous topic (Drawings Numbering System – Part One), I explained The UDS sheet identification format which include four components as follows:

1. The discipline designator.
2. The hyphen.
3. The sheet type designator.
4. The sheet sequence number.

Also, I explained the first components; the discipline designator & the two Levels of sheet identification. 

Drawing Numbering to be done as per UDS

Today, I will continue explaining other components of the UDS sheet identification format as follows:

A	A	-	N	N	N
The Hyphen

 Second Component: The hyphen 

A dash (usually called the hyphen) always follows the discipline designator, to separate the discipline designator characters from the sheet number.



Third Component: Sheet Type Designator

A	A	-	N	N	N
Sheet Type Designator

The third component of the sheet identification format is the sheet type designator. The sheet type is identified by a single numerical character as follows:

Sheet Type Designator identifies the type of information on the sheet and of course, it will have a value from 0 to 9 according to the type of information on the sheet as in the below table.

Level 2 Designator
0	General (Symbols Legend, Notes, Etc.)
1	Plans (Horizontal Views)
2	Elevations (Vertical Views)
3	Sections (Sectional Views, Wall Sections)
4	Large-Scale Views (Plans, Elevations, Stair Sections, Or Other Sections That Are Not Details)
5	Details
6	Schedules And Diagrams
7	User Defined (For Types That Do Not Fall In Other Categories, Including Typical Detail Sheets)
8	User Defined (For Types That Do Not Fall In Other Categories)
9	3D Representations (Isometrics, Perspectives, Photographs)

Notes:

• All sheet types may apply to all discipline designators. It is not necessary to use all the sheet types for a project or within a discipline. 
• The use of sheet type designators does not preclude combining different types of drawings on the same sheet for simplicity. For instance, it is acceptable to do the following: 

1. Place profile drawings on sanitary sewer or road plan sheets.
2. Place same scale sections on the same sheet as large-scale plans of stairs or escalators.
3. Place schedules on a plan sheet when the information is closely associated.
4. Different types of drawings may be combined on the same sheet on small projects.
5. When the type of drawings on a sheet is mixed, clearly identify all of the drawings contained on the sheet in the sheet title block. 

A	A	-	N	N	N
Sheet Sequence Number

Forth Component: Sheet Sequence Number

It is the forth component of the sheet identification format; it consists of 2 digits which identifies each sheet in a series of the same discipline and sheet type.


Notes:

• Sequence numbering starts with 01; sheet number 00 is not permitted. The first sheet of each series is numbered 01, followed by 02 through 99. 
• Sequence numbers need not be sequential, to permit future insertion of sheets during design. 
• While many projects may not require more than a single digit, standardization of a two-digit sequence number allows for efficient electronic file sorting and facility management databases. 
• On plan sheets, it may be desirable to replicate the floor name within each discipline. This makes sheets A-102, M-102, and E-102 the second floor plan for each of the various disciplines. This system may become cumbersome when basements and mezzanines or split-level plans are involved. Evaluate each project carefully before deciding to implement this option.

User-defined designators for Additional drawings:

A	A	-	N	N	N	-	U	U	U
User-defined designators for Additional drawings

Additional drawings inserted in a set of drawings after a sheet identification organization has already been established can be identified with a suffix. This suffix may be comprised of three user-defined designators.

To download a complete list of Sheet Identifications, please click on the link.

In the next Topic, I will explain the Drawing Line Types. So, please keep following.