CERN -- European Laboratory for Particle Physics

CERN Drawing Directory

Welcome to the Cern Drawing Directory General Information Page !

Click here What is CDD ? Click here Connect to CDD Web
Click here Life Cycle of a drawing Click here CDD Web utilities
Click here CAD Life cycle of a drawing Click here Standard operations of CDD
Click here HPGL Viewer Click here CDD Support Team
Click here What's new in version 1.2a ? Click here CDD user's manual: PostScript or Acrobat file
Click here Statistics

What is CDD ?

CDD is the acronym for CERN Drawings Directory.

It is a web application which manages engineering drawings made either at CERN or in an external company. The aim of CDD is not to only store an electronic print of the graphical drawing itself, but also to store a reference with key information related to the drawing.

Drawings following different numbering systems (how the drawing id is generated depending on the system) and different management rules can be handled by CDD. The only condition is that those particular functionalities are well defined.

Several drawing systems have been identified at CERN and therefore, they were considered when designing the application. The current version of CDD focuses on the following naming systems: EST (which is principally used for the LHC project), LEP, ST-EL, SPS, ALICE, ATLAS, CMS, CNAO,CV-CE98, GS-SE and LHC-b. Other CERN systems can be easily integrated on demand.

Life cycle of a drawing

First, designers create their drawings using one of the available CAD (Computer Aided Design) tools, which can be CATIA or AutoCad.

Then, via CDD, the drawings information are entered in a database. This operation might be done either automatically from the CAD tool and CartWeb, or manually directly in CDD.

Once the drawing exists in the database, it can be modified, controlled, approved, classified and consulted, according to the rules defined for each drawing system at CERN, using the CDD application.

When a drawing is ready to be archived, it is automatically stamped and stored in HPGL format. Once the archival process is over, the drawing can be visualised but no longer modified.

     Life cycle scheme

The archiving process may fail for some reasons. Here is a list of the possible archiving errors, the reason why they occurred and what to do in some cases.

CAD Life cycle of a drawing

The CAD life cycle allows to manage drawings in a consistent way between SmarTeam, CDD and EDMS.

This new life cycle was introduced to release the CAD models in SmarTeam through the existing drawings release mechanism. It also solves one of the main issues of SmarTeam and CDD where there was no way of knowing the dependencies between drawings. The impacts where thus not taken into account. Note that this is still the case for drawings that are not managed in SmarTeam (i.e. Autocad drawings).

The new life cycle was created in SmarTeam and EDMS, it is shown in the following diagram:

The "Ready for Archiving" and "Archived" statuses in EDMS are considered as internal (they are not mapped in SmarTeam). Once the drawing is correctly archived, depending on its QAC, it is automatically moved to the next status. This could be one of the following: "Released" if QAC < QAC A (less restricted than two controls + approval) , "Ready for approval" (not represented on the mapping image) if QAC= QAC A or "Released for info" (not represented either) if the drawing follows the Atlas rules.

For further information on how to use the life cycle in SmarTeam see SmarTeam - Life Cycle.

Standard operations of CDD
CDD Support Team

There is a support team always ready to answer to every question or problem.
Just email to

CDD user's manual & other documents

Get the user's manual in PostScript or Acrobat file.

CDD Utilities

Creation date: 1997-02-26 by SP, Last update : 2017-07-20 by Claudio Scoero