SLAC Mechanical Design
19 Dec 1995
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ENGINEERING DOCUMENT NUMBERING SYSTEM
- 1.1 Purpose
- 2.1 Applicable Documents
- 3.1 Format
- 3.2 Approved Prefix List
- 3.3 Special Cases
- 3.4 Typical Document Numbering Organization- GENERAL
- 3.5 Typical Document Numbering Organization- MECHANICAL
- 3.6 Multiple Sheet Revision Procedure
This document describes requirements for assigning numbers to SLAC Engineering
documents and is intended that this system be compatible with machine
2.1 Applicable Documents
All Engineering documents shall carry a unique identification number consisting
of five groups: (1) a two letter prefix, (2) a three digit number, (3) a
second three digit number, (4) a two digit suffix, and (5) the letter R, C, or E
followed by one or two digits. These five components shall be separated by
|EXAMPLE: ||PF- ||123- ||456- ||78- ||R9|
| (1) ||(2) ||(3) ||(4) ||(5)
1. Two Character Prefix: An appropriate Prefix from the Approved Prefix List (below) indicating the type of drawing.
2. First 3-digit number: This is the first part of the hyphenated SLAC 6-digit
base number system and shall signify the originating division department,
group, or individual as determined from blocks of numbers as assigned by SLAC
3. Second 3-digit number: This is the second part of the hyphenated SLAC
6-digit base number system and shall signify a discrete portion of the assigned
work of a division, department, group, or individual as assigned by SLAC
4. Two-digit suffix: This suffix shall be assigned by the originating
division, department, group, or individual to distinguish one assembly,
sub-assembly, or part from another.
5. The Revision character: The purpose of this character is to identify each revision or
change of any part of an engineering document:
- For all manually produced documents:
- R shall be used to indicate Revision e.g., R0.
- For documents produced by the CAD System:
- for IGDS (Microstation) files, C shall be used,
- for EMS (Intergraph EMS) files, E shall be used, e.g., C0 and E0
3.2 Approved Prefix List
Prefix: Each prefix shall consist of two letters of combination selected from
the following approved list which shall designate the type of Engineering
Document as determined by the originator. See Page 6 for prefix descriptions.
|Prefix ||Document Type||Prefix ||Document Type|
|AD ||Assembly Drawing
||AP ||Administrative Procedure|
|AT ||Test Procedure
||BD ||Block Diagram|
|CA ||Cable Drawing
||CD ||Circuit Description|
|CL ||Cable List
||CM ||Computer Manual|
|DD ||Design Data
||DI ||Design Information |
(No longer assigned)
|DL ||Drawing List
||DS ||Design or Drafting Standard|
|ED ||Electronic Design Criteria
||EI ||Electrical Interconnection|
|ES ||Elementary Single Line
||FC ||Flow Chart|
|FD ||Flow Diagram
|FM ||Field Modification
||FP ||Fabrication and Process Standard|
|GP ||General Purpose
||ID ||Installation Drawing|
|IM ||Instructional Manual
||IR ||Inspection Report |
(No longer assigned)
|IS ||Installation Specification
||LD ||Logic Diagram|
||MA ||Multiple Sub-Assembly|
(No longer assigned)
|ML ||Material List
||MP ||Multiple Part Drawing|
(Not a preferred method)
|NC ||Numerical Control Tape Line Diagram
||OF ||Office Form|
|OM ||Operational Manual|
(No longer assigned; see IM)
|PB ||Patch Board|
|PC ||Printed Circuit
||PD ||Piping Diagram|
|PF ||Fabricated Part Detail
||PR ||Rack Profile|
|PS ||Purchase Specification (Technical)
||PT ||Program Table|
|QC ||Quality Control Standard
||QT ||Qualification Test Procedure|
|RD ||Repair Description
||RL ||Running List|
|SA ||Sub-Assembly Drawing
||SC ||Specification Control Drawing|
|SD ||Schematic Diagram
||SI ||Silkscreen Drawing|
|SP ||System Specification
||SR ||Safety Regulation|
|SS ||System Schematic (Technical)
||ST ||System Test Procedure|
|TD ||Transport Deck
||TF ||Tool Fixture|
|TI ||Trunk Interconnect
||TR ||Technical Report|
|WD ||Wiring Diagram
||WL ||Wire List|
3.3 Special Cases
1. Certain engineering documents, such as drawing lists or material lists,
often have more than one sheet or page with the same number. Each sheet or page
shall be designated by using Sheet 1 of 2 or Page 1 of 10, whichever may be
3.4 Typical Document Numbering Organization - GENERAL
|FINAL ASSEMBLY AND|
|SUB-ASSEMBLY "A" AND|
|SUB-ASSEMBLY "B" AND|
3.5 Typical Document Numbering Organization - MECHANICAL
3.6 Multiple Sheet Revision Procedure
Revisions to multiple sheet drawings shall be accomplished by completing the
revision block on Sheet 1 to document all changes to any sheet in the multiple
group. All sheets shall carry the same revision number as Sheet 1.
AD - ASSEMBLY DRAWING (TOP ASSEMBLY) - ELECTRONICS
The AD Drawing (Top Assembly) shall always have the suffix 00, i.e.,
AD-123-456-00. The Top Assembly is the highest level of assemblies for a
particular project. The Project should be defined by the engineer or the group
supervisor. The Top Assembly will consist of all SA drawings, PF fabricated
parts, hardware and any purchased items that have not been called out on
AD - ASSEMBLY DRAWING (TOP ASSEMBLY) - MECHANICAL
An AD Drawing for the Mechanical Design Group does not have to end with the suffix -00. The AD drawing is the top-most assembly drawing of an assembly.
- Vacuum Drift Tube
- A magnet
- Any component that can function without further assemblies added to it
AP - ADMINISTRATIVE PROCEDURE
A document or drawing which details the steps necessary to perform a specific
procedure, job or operation. To simplify making changes to Subcontract
drawings, refer to AP-041-300-01.
AT - TEST PROCEDURE
A written description of a test procedure, with or without a pictorial
description of the set up.
BD - BLOCK DIAGRAM
A diagram of a system, instrument, computer program, or for organizational
representation, in which selected portions are represented by annotated boxes
and interconnecting lines and/or arrows. A Block Diagram generally starts at
the top or left side, and progresses down or to the right.
CA - CABLE DRAWING
An assembly drawing of a cable indicating overall dimensions including or
excluding terminators, tolerances, connectors or terminals, special assembly
instructions, and applicable tests if required.
CD - CIRCUIT DESCRIPTION
A description of a circuit expressed simply and in conjunction with the
schematic diagram making the circuit easily understood.
CL - CABLE LIST
A document showing cable number, type, terminations, and any pertinent
CM - COMPUTER MANUAL
A manual giving instruction in the operation and maintenance of a computer or
DD - DESIGN DATA
A document giving design information for electronic, mechanical or vacuum
components or systems. This document would be useful as a manufacturing or
DL - DRAWING LIST
An engineering document listing all drawings required for the fabrication,
assembly, and maintenance of a piece of equipment or of a system. This
document indicates the latest revisions for each drawing listed.
DS - DESIGN OR DRAFTING STANDARD
A document or drawing which details specific parameters for the design and
drafting of a particular part or system.
ED - DESIGN CRITERIA
A standard or set of rules by which components can be selected for a complete
system or circuit.
EI - ELECTRICAL INTERCONNECT
A form of connections or a wiring diagram which shows only external connections
among units, sets, groups, and systems.
ES - ELEMENTARY SINGLE LINE DIAGRAM
A drawing which shows by means of graphic symbols and single lines the course
of an electrical circuit or system of circuits, and the component devices or
parts used. The Single Line Diagram covers basic information but omits much of
the detailed information normally shown on schematic diagrams.
FC - FLOW CHART
A diagrammatic representation of a sequence of operations.
FD - FLOW DIAGRAM
A drawing or fluid power diagram which indicates by directional arrows and
graphic symbols the major components of a system and their locations relative
to one another, as well as the direction of flow within the circuit.
FL - FILM
Films generated from artwork master or from the CADD System used to fabricate
PC boards or make silk screens.
FM - FIELD MODIFICATION
An engineering document that lists changes on assemblies, systems or purchased
items. The document shall contain complete information for accomplishing the
FP - FABRICATION PROCESS
A document which describes the minimum requirements and/or sequence of steps to
complete a fabrication process such as painting, cleaning, heat treating,
and/or the screening/assembly sequence for a hybrid circuit.
FS - FUNCTIONAL SCHEMATIC
A Functional Schematic is a diagram which shows mainly external connections
between unit assemblies or equipment. The only internal connections of the
unit assemblies or equipment shown are those which pertain to the particular
function that is being presented. Component values are not on an FS.
GP - GENERAL PURPOSE
A drawing that fits no specific prefix such as a site plan or general
arrangement for a study project, most generally not intended for construction
HC - HYBRID CIRCUIT
A drawing representing a hybrid circuit artwork to be used as a circuit image
for reference or to produce films for fabrication.
ID - INSTALLATION DRAWING
1. Mechanical Type -
The Installation drawing pulls together all AD Top Assemblies, SA
Subassemblies, PF Fabricated Part drawings, purchased parts and hardware needed
to complete the installation of a particular component into the system. The
drawing should show reference/locating dimensions and have any special notes
to aid the installer. This drawing is the starting point for tracking down the
proper replacement parts by the installers.
2. Facilities Type Drawing -
A drawing shows all the necessary information and pertinent dimensions
necessary to install a device or system. It may be used to install a magnet or
an instrument, or for facilities type drawings for buildings, utilities, and
such, quite often accompanied by a "PS", Purchase Specification, (outside
procurement), or by an "IS", Installation Specification.
IM - INSTRUMENT MANUAL
A document which completely and explicitly details all the necessary steps to
operate or assemble a device or system.
IS - INSTALLATION SPECIFICATION
A document which specifies work procedures, standards of quality of materials
and workmanship for installation of equipment or facilities.
LD - LOGIC DIAGRAM
A drawing showing by means of graphic symbols the sequence and function of
LO - LAYOUTS
Layout drawings that would not otherwise be released. ie. 3D CAD Models, Ray
Trace Studies and System layouts longer than 12'.
ML - MATERIAL LIST
A document listing all the materials necessary for the fabrication and assembly
of a device, chassis, system, etc. Only Sheet One carries the revision note
but all subsequent sheets carry the revision number.
NC - NUMERICAL CONTROL TAPE
A paper or mylar tape document generated on the computer or CADD System used
for machine control for the fabrication of a printed circuit board, sheet metal
parts, and for the fabrication of machined parts for mechanical devices.
OF - OFFICE FORM
A form to be used as a master for producing various standard format sheets.
PB - PATCH BOARD
A document showing patch board connections. Used primarily in the Main
PC - PRINTED CIRCUIT
A drawing representing a circuit board artwork to be used as a circuit image
for reference or to produce films for fabrication.
PD - PIPING AND INSTRUMENTATION DIAGRAM (P&ID)
A drawing showing all equipment, valves, instruments and devices of a
mechanical circuit. Flow arrows are indicated as well as line sizes and
numbers. Ordinary fittings are not necessarily shown.
PF - FABRICATED PART
1. A drawing of a single part calling out all required information to fabricate
2. A simple weldment where are shown all necessary dimensions and weld symbols
to fabricate the part. This drawing cannot call out other drawings or purchased
parts to be welded together. A weldment cannot be disassembled.
PR - RACK PROFILE
An engineering document locating each piece of equipment or panel at the proper
elevation in a rack. Each unit shown shall include its title and its document
PS - PURCHASE SPECIFICATION
A document which specifies standards of quality of material, devices or
equipment for purchase by the SLAC Purchasing Department.
PT - PROGRAM TABLE
A document used in the programming of programmable devices such as integrated
QC - QUALITY CONTROL STANDARD
A document which describes the minimum requirements for the manufacturing,
assembling and workmanship in furnishing electrical, electronic, mechanical, or
general parts or equipment.
QT - QUALIFICATION TEST PROCEDURE
A document or drawing which shows or describes a specific procedure for testing
a new or untried manufacturing or operating procedure.
RD - REPAIR DESCRIPTION
A document or drawing which shows or describes a specific procedure for
effecting repairs to a device, instrument or piece of equipment.
RL - RUNNING LIST
A listing of point-to-point circuit connections to facilitate wiring, checkout,
and maintenance of a device, panel or system.
SA - SUBASSEMBLY
1. A drawing taking PF fabricated parts, other assemblies and/or purchased
parts and fastening them together to create another assembly.
2. A weldment type drawing with separate PF fabricated parts and/or purchased
parts called out on the drawing.
SC - SPECIFICATION CONTROL DRAWING
A drawing which indicates design and fabrication parameters for a part, system
or a piece or equipment. It will accompany either a Purchase Specification (PS)
or a Purchase Requisition.
SD - SCHEMATIC DIAGRAM
A schematic or elementary diagram shows by means of graphic symbols the
electrical connections and functions of a specific circuit arrangement. A
schematic diagram facilitates tracing the circuit and its functions without
regard to the actual physical size, shape, or location of the component devices
SI - SILK SCREEN DRAWING
A marking drawing showing the location of information to be silk screened onto
SP - SYSTEM SPECIFICATION
A document describing the parameters of a complete electrical, electronic, or
SR - SAFETY REGULATIONS
A document outlining specific procedures to follow for accident prevention,
such as specific color codes, eye protection, etc., to safeguard against
physical hazards and radiation.
SS - SYSTEM SCHEMATIC
A document showing system operation, system components, locations, cables and
interconnects. The SS prefix was occasionally used in the past for a system
specification, but will no longer be used in this capacity. The prefix for
system specification is now SP.
ST - SYSTEM TEST PROCEDURE
Written description of a System Test Procedure, with or without a pictorial
description of the setup.
TD - TRANSPORT DECK
Assigned to Golden Deck.
TF - TOOLING FIXTURE
The prefix TF is used instead of the Prefix SA (subassembly) when designing
tooling fixtures. The Prefix PF will still be used for fabricated parts to be
used in the Tooling Fixture.
TI - TRUNK INTERCONNECT
A listing of trunk cable connections.
TR - TECHNICAL REPORT
A document for outlining a project, reporting progress on a project, or for
describing in detail the technical aspects of a project.
WD - WIRING DIAGRAM
A wiring diagram shows the electrical connections of an installation, or of its
component devices or parts. It may cover internal or external connections or
both, and contains such detail as needed to make or trace connections that are
involved. A wiring diagram usually shows general physical arrangement of the
component devices or parts. A wiring diagram may be prepared in the form of a
WL - WIRE LIST
An engineering drawing consisting of tabulated data and instructions required
to establish wiring connection within or between pieces of equipment.
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