BGS-EN-04-R0 Drawing Development · AWS A2.4, Standard Symbols for Welding, Brazing, and Nondestructive Examination BGS-AD-01, Document Preparation and Control BGS-EN-01, Engineering/Design

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DRAWING DEVELOPMENT

BGS-EN-04 Revision 0

BGS Proprietary Information Notice

This document and the information it contains is property of Boston Government Services, LLC (BGS). It shall not be reproduced, or its content otherwise made available to non-BGS parties without the express written consent of Boston Government Services, LLC.

FUNCTIONAL AREA: Engineering BGS-EN-04 REV. 0

PROCEDURE TITLE: Drawing Development

EFFECTIVE DATE: 11/13/18

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Revision History

Rev. # Effective

Date By Type1 Changes

0 11/13/2018 B. Noe N Initial release of procedure.

1 M = major change, mc = minor change, N = new




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TABLE OF CONTENTS

1. PURPOSE ............................................................................................................................ 4

2. SCOPE ................................................................................................................................. 4

3. REFERENCES ..................................................................................................................... 4

4. DISCUSSION AND OVERVIEW .......................................................................................... 5

5. DEFINITIONS AND ACRONYMS ........................................................................................ 5

6. RESPONSIBILITIES .......................................................................................................... 11

6.1 Checkers...................................................................................................................... 11 6.2 Chief Engineer ............................................................................................................. 11 6.3 Document Control Administrator (DCA) ....................................................................... 12 6.4 Originator ..................................................................................................................... 12 6.5 Licensed Professional Engineer (PE) .......................................................................... 12 6.6 Project Lead Engineers ............................................................................................... 12 6.7 Project Managers ......................................................................................................... 12 6.8 Responsible Engineer .................................................................................................. 12

7. PROCEDURE .................................................................................................................... 13

7.1 General Requirements ................................................................................................. 13 7.2 Drawing Development ................................................................................................. 13 7.3 Drawing Checks and Verification ................................................................................. 14 7.4 Drawing Approval and Issuance .................................................................................. 15 7.5 Revisions to Drawings ................................................................................................. 16 7.6 Sketches ...................................................................................................................... 16 7.7 Documentation ............................................................................................................. 17

8. RECORDS ......................................................................................................................... 17

9. ATTACHMENTS ................................................................................................................ 17

Attachment 1 – BGS Drafting Practices ................................................................................... 18




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1. PURPOSE

The purpose of this procedure is to establish responsibilities, requirements, and the necessary instructions/processes for developing drawings in support of engineering/design activities performed by Boston Government Services (BGS).

2. SCOPE

This procedure applies to drawing development activities performed under BGS’s Quality Assurance (QA) Program.

This procedure employees a “graded-approach” in accordance with Quality Levels determined per BGS-QA-03, Graded Approach and described within BGS-EN-01, Engineering Design Control. The level of rigor applied to an engineering/design activity is commensurate with the activity’s relative importance to nuclear safety and the hazards involved.

3. REFERENCES

American Society of Mechanical Engineers (ASME) B18.24, Part Identifying Number (PIN) Code System Standard for B18 Fastener Products

ANSI/ISA 5.1-2009, Instrumentation Symbols and Identification

ASME Y14.1, Decimal Inch Drawing Sheet Size and Format

ASME Y14.100, Engineering Drawing Practices

ASME Y14.2, Line Conventions and Lettering

ASME Y14.24, Types and Applications of Engineering Drawings

ASME Y14.3, Multiview and Sectional View Drawings

ASME Y14.36M, Surface Texture Symbols

ASME Y14.38-2007, Abbreviations and Acronyms for Use on Drawings and Related Documents

ASME Y14.4, Pictorial Drawing

ASME Y14.41, Digital Product Definition Data Practices

ASME Y14.5-2009, Dimensioning and Tolerancing

AWS A2.4, Standard Symbols for Welding, Brazing, and Nondestructive Examination

BGS-AD-01, Document Preparation and Control

BGS-EN-01, Engineering/Design Control

BGS-EN-02, Design Interface Control and Plans

BGS-EN-07, Design Verification




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BGS-EN-08, Design Change Control

BGS-EN-11, Design Record File

BGS-ENF-01.1, Design Input Record

BGS-ENF-02.1, Engineering/Design Project Interface and Work Plan

BGS-QA-03, Graded Approach

BGS-QAP-01, Corporate Quality Assurance Plan

BGS-RM-01, Quality Assurance Records

ERDC/ITL TR-09-2, A/E/C CAD Standard

ISO 1219-1-2012, Fluid power systems and components – Graphical symbols and circuit diagrams – Part 1: Graphical symbols for conventional use and data-processing applications

ISO 1219-2, Fluid power systems and components – Graphical symbols and circuit diagrams – Part 2: Circuit diagrams

4. DISCUSSION AND OVERVIEW

This procedure is to be utilized for engineering drawings required as a client deliverable.

5. DEFINITIONS AND ACRONYMS

Acceptance criteria Specified limits placed on performance, results, and other characteristics of an item, process, or service defined in codes, standards, or other requirement documents. (NQA-1-2009)

ANSI American National Standards Institute

ASME American Society of Mechanical Engineers

ASNT American Society for Nondestructive Testing

AWS American Welding Society




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Basic Component - For nuclear power plants licensed under 10 CFR Part 50 or Part 52, a basic component is a structure, system, or component (SSC), or part thereof, affecting its safety function necessary to assure: (1) the integrity of the reactor coolant pressure boundary; (2) the capability to shut down the reactor and maintain it in a safe shutdown condition; (3) or the capability to prevent or mitigate the consequences of accidents which could result in potential offsite exposures.

- For other facilities and activities licensed under 10 CFR parts 30, 40, 50) other than nuclear power plants), 60, 61, 63, 70, 71, or 72, a basic component means a SSC, or part thereof, affecting its safety function, that is directly procured by the licensee of a facility or activity subject to the regulations in 10 CFR 21 and in which a defect or failure to comply with any applicable regulation could create a substantial safety hazard.

- In all cases, ‘basic component’ includes safety-related design, analysis, inspection, testing, fabrication, replacement of parts, or consulting services that are associated with the component hardware, design certification, design approval, or information in support of an early site permit application under part 10 CFR part 52, whether these services are performed by the component supplier or others. (10 CFR Part 21)

BGS Boston Government Services, LLC

CADD Computer Aided Design and Drafting

CFR Code of Federal Regulations

Characteristic Any property or attribute or an item, process, or service that is distinct, desirable, and measurable. (NQA-1a-2009)

Commercial Grade Dedication (CGD)

An acceptance process undertaken to provide reasonable assurance that a Commercial Grade Item (CGI) to be used as a basic component will perform its intended safety function and, in this respect, is deemed equivalent to an item designed and manufactured under an NQA-1 quality program.




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Commercial Grade Item (CGI)

- For nuclear power plants and activities licensed pursuant to 10 CFR Part 30, 40, 50, 52, or 60, a CGI is an SSC or part thereof that affects the safety function, that was not designed or manufactured as a basic component. CGIs do not include items where the design and manufacturing process require in-process inspections and verifications to ensure that defects or failures to comply are identified and corrected (i.e., one or more critical characteristics of the item cannot be verified).

- For nuclear facilities and activities licensed pursuant to 10 CFR Parts, 30, 40, 50 (other than power plants), 60, 61, 62, 70, 71, or 72, a CGI is an item satisfying the following:

Not subject to design or specification requirements that are unique to those facilities or activities;

Used in applications other than those facilities or activities; and

To be ordered from the manufacturer/supplier on the basis of specifications set forth in the manufacturer’s published product description (e.g., catalog).

- For Department of Energy nuclear facilities and activities regulated under 10 CFR 830, a CGI is an SSC or part thereof, that affects its safety function, that was not designed and manufactured in accordance with the requirements of an NQA-1 quality program. (NQA-1-2009)

Critical Characteristics

Important design, material, and performance characteristics of a commercial grade item or service that, once verified, will provide reasonable assurance the item will perform its intended safety function. (NQA-1a-2009)

DAC Design Analyses and Calculation

DCA Document Control Administrator




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Defect (1) A deviation in a basic component delivered to a purchaser for use in a facility or an activity subject to the regulations in 10 CFR 21, on the basis of an evaluation, the deviation could create a substantial safety hazard; or (2) The installation, use, or operation of a basic component containing a defect as defined in this section; (4) A condition or circumstance involving a basic component that could contribute to the exceeding of a safety limit, as defined in the technical specifications of a license for operation issued pursuant to 10 CFR Part 50; (5) An error, omission or other circumstance in a design certification, or standard design approval that, on the basis of an evaluation, could create a substantial safety hazard. (10 CFR Part 21)

Design Technical activities that commence with the identification of conceptual input and lead to and include the production of output documentation.

Design Authority The organization having the responsibility and authority for approving the design bases, the configuration, and changes thereto. (NQA-1a-2009)

Design Bases That information which identifies the specific functions to be performed by a structure, system, or component (SSC) of a facility, and the specific values or ranges of values chosen for controlling parameters as reference bounds for design. These values may be (a) restraints derived from generally accepted “state-of-the-art” practices for achieving functional goals; or (b) requirements derived from analysis (based on calculations and/or experiments) of the effects of a postulated accident for which an SSC must meet its functional goals. (NQA-1a-2009)

Design Change Any revision or alteration of the technical requirements defined by approved and issued design output documents and approved and issued changes thereto. (NQA-1a-2009)

Design Input Those criteria, performance requirements, codes and standards, design bases, regulatory requirements, or other design requirements upon which detailed final design is based. (NQA-1a-2009)

Design Output Drawings, specifications, and other documents used to define technical requirements of SSCs, and computer programs. (NQA-1a-2009)




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Design Record File (DRF)

A compilation of all the design information developed during an engineering/design project for a Client, usually considered to be a project deliverable.

Design Records Records that document the development of the engineering definition(s) for a product, which includes, but may not be limited to, electronic models, design drawings, design analyses and calculations, reports, design specifications, supplier data, conference notes, presentation materials, design requirements documentation, action item logs, etc.

Design Review A critical review to provide assurance that the final design is correct and satisfactory. (NQA-1a-2009) A formal design review which provides a forum for design evaluation and critique by design engineering, project management, manufacturing, and experienced participants from other organizations at appropriate points during design development. A design review may have a variety of forms and content requirements depending on the stage or maturity of the design activity.

Design Specification A document that provides explicit information about the requirements for an SSC and how the SSC is to be constructed, fabricated, assembled, procured, etc. The design specification may include all necessary drawings, dimensions, environmental factors, maintenance factors, functional and operating requirements, etc.

Design Verification (DV)

A technical review performed by individual(s) not directly associated with the original design intended to ensure the validity of the design of a structure, system, and component (SSC). Critical reviews, alternate calculations, and/or verification testing are employed to provide thorough, in depth validation that all the design input requirements have been adequately addressed in the design, that the design is appropriate and reasonable in view of the design inputs, and that the design is adequately documented.

Design, Final Approved design output documents and approved changes thereto. (NQA-1a-2009)

Designer The person responsible for the design of a SSC, or specified part thereof.

DIR Design Input Record




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Drawing A formal, graphic representation of a design concept by the use of established projection methods and symbols. A drawing is used to convey the characteristics of physical objects such as configuration, relative location, size, dimensions, and materials, or the significant elements of a structure, system or component (SSC), process, or function. Engineering/design drawings may be generated using computer aided design and drafting (CADD) computer programs or manually produced.

Drawing Check A non-technical review of design drawing(s) for, as applicable, legibility, use of the proper format(s), abbreviations, material identifications, parts listings, dimensioning, tolerancing, notes, symbols, quality markings, security markings, and numbering and any other documentation requirements by an individual not directly involved in that portion of the design.

EE Electrical Engineer

EN Engineering

Graded Approach The process of ensuring that the levels of analysis, documentation, and actions are commensurate with (1) the relative importance to safety, safeguards, and security, (2) the magnitude of any hazard involved, (3) the life cycle stage of a facility, (4) the programmatic mission of a facility, (5) the particular characteristics of a facility, (6) the relative importance of radiological and non-radiological hazards, and (7) any other relevant factor. (10 CFR 830)

HVAC Heating, Ventilation, and Air Conditioning

I&C Instrumentation & Control

Inspection Examination or measurement to verify whether an item or activity conforms to specified requirements (NQA-1a-2009) A form of validation of design wherein the technical design documentation is compared to certain criteria and/or the final product is compared to the design outputs and/or specific criteria

ISO International Organization for Standardization

Item An all-inclusive term used in place of any of the following: appurtenance, assembly, component, equipment, material, module, part, structure, subassembly, subsystem, system, or unit. (NQA-1a-2009)

ME Mechanical




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P&ID Piping and Instrumentation Diagram

PE Professional Engineer

QA Quality Assurance

Safety-Related Those systems, and the components and structures thereof, which, by virtue of failure to perform in accordance with the design intent, have the potential to impact on the radiological, chemical, and toxicological safety of the public or plant personnel from the operation of the nuclear facility.

Sketch A rapidly executed freehand drawing that is not intended to be issued as a quality record. A sketch may be used to record or develop an idea for later use or it might be used as a quick way of graphically demonstrating an image, idea or principle. If the sketch is signed and dated it is a QA Record.

Specification A document prepared to define the requirements for a particular design and/or procurement of design services.

SSC Structure, System, or Component

Test An activity for confirming or demonstrating a quantitative function of a component or system, e.g., attains a specific temperature or pressure level; performs within a specific time, temperature range, or pressure range; etc. Tests typically have specific quantitative (numerical) acceptance criteria for such action(s).

UNS Unified Numbering System

Verification The act of reviewing, inspecting, testing, checking, auditing, or otherwise determining and documenting whether items, processes, services, or documents conform to specified requirements. (NQA-1-2009)

6. RESPONSIBILITIES

6.1 Checkers

6.1.1 Checks drawings for completeness and compliance with applicable drafting standards and practices.

6.2 Chief Engineer

6.2.1 Has overall responsibility for design activities conducted according to this procedure.




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6.3 Document Control Administrator (DCA)

6.3.1 Issues drawing numbers, includes revision numbers, to Originators.

6.3.2 Enters copies of completed drawings and related documentation into the electronic records management system.

6.4 Originator

6.4.1 Develops and/or revises drawings uses applicable drafting standards.

6.5 Licensed Professional Engineer (PE)

6.5.1 Reviews and stamps drawings when required by contract.

6.6 Project Lead Engineers

6.6.1 Oversees and coordinates drawing development, review, approval, and revision activities

6.6.2 Manages project engineering/design resources.

6.6.3 Ensures technical accuracy, completeness, and compliance with applicable design inputs.

6.6.4 Ensures drawings are checked and verified to the extent necessary.

6.7 Project Managers

6.7.1 Oversees drawing development, review, approval, and revision activities.

6.7.2 Assigns project engineering/design resources, as necessary.

6.8 Responsible Engineer

6.8.1 Initiates design activities that result in the production of drawings.

6.8.2 Ensures technical accuracy, completeness, and compliance with applicable design inputs.

6.8.3 Ensures drawings are checked and verified to the extent necessary.




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7. PROCEDURE

7.1 General Requirements

7.1.1 BGS produced drawings shall be developed using the applicable drafting standard (e.g., Attachment 1 of this procedure, client-furnished drafting standard, recognized industry drafting standard/practice) as defined in the applicable project-specific Form BGS-ENF-02.1, Engineering/Design Project Interface and Work Plan, developed per BGS-EN-02, Design Interface Control and Plans.

7.1.2 Drafting checks/reviews shall be conducted per Section 7.3 prior to the Originator releasing the drawing(s) for internal or external review.

7.1.3 Manually produced drawings may be employed in final design but should be converted to CADD drawings as soon as practical.

7.1.4 Sketches are not quality records. IF the information contained on a sketch is of permanent value (i.e. signed and dated), THEN the responsible person (e.g., Originator, Responsible Engineer, etc.) shall ensure the sketch is converted to a formal drawing per Section 7.2.

7.2 Drawing Development

7.2.1 WHEN an engineering/design activity requires development or revision of a drawing, THEN the Originator shall:

a) Obtain a drawing number and/or revision number from the DCA or Quality Assurance (QA) Manager. The drawing number has five components (BGS-DWG-PP-XX-ZZ); specifically:

BGS – Boston Government Services;

DWG – Drawing;

PP – Project designator;

XX – Drawing Type:

o EE – Electrical

o HVAC – Heating, Ventilation, and Air Conditioning

o I&C – Instrumentation and Control

o ME – Mechanical and Structural

o PID – Piping and Instrumentation

ZZ – Next sequential number.




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b) Prepare all original drawings and revisions using approved BGS CADD software or manually, as applicable.

c) IF manually produced, THEN ensure the drawing(s) is of sufficient quality to maintain legibility during scanning and/or reproduction.

d) Develop all drawings and revisions in accordance with:

Attachment 1, BGS Drafting Practices;

Client-furnished drafting standard; and/or

Other recognized drafting standard (e.g., ASME Y14.100) or industry practice applicable to the type of drawing being developed.

7.2.2 The Originator and Responsible Engineer shall ensure the content of drawings satisfies applicable functional, operational, and design input requirements identified on the applicable Form BGS-ENF-01.1, Design Input Record, that was developed per BGS-EN-01, Engineering/Design Control.

7.2.3 The Originator and Responsible Engineer should also ensure constructability, maintainability, value engineering, and sustainability, are factored into drawing development to provide the best design for the client.

7.2.4 WHEN development (i.e., drafting) of the drawing is complete, the Originator shall:

a) Enter name and date in the corresponding fields of the drawing title block; and

b) Forward the drawing, either electronically or by hardcopy, to the Checker(s) for review per Section 6.3.

7.3 Drawing Checks and Verification

NOTE

Drawing checks by multiple disciplines (i.e., mechanical, electrical, process, instrumentation & control, nuclear safety, etc.) may be necessary based on the scope of the Drawing.

7.3.1 The Checker(s) shall conduct a drafting check/review of the drawing as follows:

a) Ensure appropriate drafting standard(s) were utilized;

b) Ensure drafting is accurate;




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c) Ensure correct drawing and revision numbers;

d) Perform a visual and electronic check for adherence to applicable standards;

e) IF the Checker(s) identifies errors/mistakes during the drafting check, THEN the Checker(s) should provide the Originator with a marked-up copy of the drawing or provide electronic comments for resolution, as appropriate;

f) Since the drafting review is not a formal verification review, any comments identified in Step 7.3.1.E above are not required to be retained as QA records; and

g) Provide the drawing hardcopy, if applicable, back to the Originator, or inform the Originator the drawing is ready for verification.

7.3.2 The Originator shall address/resolve all errors/mistakes identified during the drafting check/review.

7.3.3 WHEN all drafting errors/mistakes and comments, if any, have been resolved, THEN the Originator shall initiate the verification process per BGS-EN-07, Design Verification.

a) The level of rigor applied to the verification process will be commensurate with the drawing’s relative importance to nuclear safety and the hazards involved.

b) Records related to the verification process are controlled per the requirements of BGS-EN-07, Design Verification.

c) WHEN the BGS-EN-07, Design Verification, process is complete, THEN the Originator shall submit the drawing for approval and issuance per Section 7.4.

7.4 Drawing Approval and Issuance

7.4.1 The Originator shall submit the drawing, either electronically or hardcopy, to the following individuals for approval:

Checker(s)

Responsible Engineer

Project Lead Engineer

Project Manager

Licensed PE (if applicable)




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7.4.2 WHEN all of the required approval signatures have been obtained, THEN the Originator shall forward, either electronically or hardcopy, the completed/revised drawing to the DCA for retention in Records Management, per Section 8.7.

NOTE

The drawing in Records Management becomes the “Record Copy” of the drawing and is the basis for issuing the drawing for SSC fabrication, installation, operation,

and/or licensing activities.

7.4.3 Based on contractual requirements, transmit the approved drawing to the Client and/or designated organization/party to support project activities, as applicable, in accordance with BGS-EN-01, Engineering/Design Control.

7.4.4 IF necessary, THEN initiate revisions to approved drawings per Section 7.5.

7.5 Revisions to Drawings

7.5.1 IF necessary to implement a design change per BGS-EN-08, Design Change Control, THEN Project Lead Engineers/Managers, Responsible Engineers, Originators, and Checkers, ensure revisions/changes to approved drawings are reviewed and approved by the same affected groups or organizations that checked, reviewed, verified, and approved the original drawing.

7.5.2 IF a revision to an approved drawing is necessary, THEN the Originator shall perform the following:

a) Notify the DCA of the need to revise an approved drawing AND obtain the next revision number in accordance with BGS-AD-01, Document Control;

b) Prepare the drawing revision per Section 7.2; and

c) Annotate the changes made in the drawing’s Revision Block.

7.5.3 WHEN the revised drawing is complete and ready for checking/verification/approval, THEN the Originator shall forward the drawing for checking, verification, approval, and issuance per Sections 7.3 and7.4.

7.6 Sketches

7.6.1 The person preparing the sketch (e.g., Originator, Responsible Engineer, etc.) should create the sketch as follows:

a) Use good drafting practices;




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b) Verify the sketch accurately portrays the desired technical information;

c) Sign and date the sketch; and

d) Forward the sketch to the Project Lead Engineer for review and approval.

7.6.2 The Project Lead Engineer shall:

a) Review the sketch; and

b) Indicate approval by signing and dating the sketch.

c) Provide approved sketch as a QA record per Section 7.7.

7.7 Documentation

7.7.1 Project Managers ensure reviews, approvals, and issuance of documents and their revisions are controlled as QA records in accordance with BGS-RM-01, Quality Assurance Records. (see Step 7.3.1.F for exception).

7.7.2 Depending on contractual requirements, approved drawings may be project deliverables and/or may become part of the engineering/design project’s design record file per BGS-EN-11, Design Record File.

8. RECORDS

The following records are generated and maintained as records according to BGS-RM-01, Quality Assurance Records:

Approved drawings, including revisions, as applicable.

Project Deliverable Transmittals

Approved Sketches

9. ATTACHMENTS

Attachment 1 – BGS Drafting Practices




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Attachment 1 – BGS Drafting Practices

I. TYPES OF DRAWINGS

In accordance with current ASME Y14.24, Types and Applications of Engineering Drawings, there are numerous types of drawings used for design definition including part detail drawings, assembly drawings, specification drawings, schematic drawings, process drawings, interface control drawings and installation drawings. A drawing tree can also be utilized to plan and control drawing development in the context of a project. These drawings will be described briefly below. More detailed information and examples of these and other types of drawings may be referred to in ASME Y14.24 for content and format when needed.

In addition, ERDC/ITL TR-09-2, A/E/C CAD Standard (U.S. Army Corps of Engineers AEC CADD standard), describes the types and application of architectural, structural, piping and instrumentation diagram (P&ID), and electrical schematic drawings.

A. Part Detail Drawings

A part detail drawing shows all the information necessary for fabricating an item, including the material from which it is made and those finishes, protective coatings, and processes required to fabricate the end product. Part detail drawings shall provide the details of only one unique part per drawing. These may include multiple sheets as necessary to fully describe the part.

B. Assembly Drawings

Assembly drawings shall provide the details of an assembly of two or more separable parts, or a group of sub-assemblies joined to form a higher assembly. These drawings shall include a parts list which identifies each unique component. These drawings are intended to define only one unique assembly. Similar assemblies such as right-hand/left-hand shall be detailed on a separate drawing. Where applicable, one drawing may reference another by notation.

C. Inseparable Assembly Drawings

An inseparable assembly drawing delineates items (pieces) which are separately fabricated and are permanently joined together (e.g., welded, brazed, riveted, nailed, bonded, etc.) to form an integral unit (part) not capable of being readily disassembled. An inseparable assembly drawing shall fully define the end product or detail assembly as assembled. Dash numbered components of an inseparable assembly must be completely defined within the assembly drawing and may not be reused on other assemblies or assembly drawings.

D. Interface Control Drawings

Interface control drawings are unique in that they may not contain parts or assemblies, but detailed dimensional information to control the interface dimensions of other parts and assemblies. An interface control drawing shall be used to maintain compatibility of all physical and functional designs between different engineering design activities. The drawing shall communicate design criteria such as dimensions, hole and/or bolt sizes,




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hardware, and ultimate changes relative to co-functioning systems. “Interface Control Drawing” shall be added directly above the Title Block. No list of materials is permitted on this type of drawing since it is not to be used to manufacture parts.

E. Installation Drawings

An installation drawing shows where and how parts and/or assemblies are installed relative to supporting structure or associated items. It shows locating dimensions, tolerancing, specifies attaching parts (such as rivets, bolts, or screws) and specific adjustments, assembly instructions, and processes required for completing and inspecting the installation.

The portion of the structure into which the installation is being installed shall be shown in phantom and identified by its part number. Such identifications shall be indicated as reference information by enclosure of the part number in parentheses or by use of the symbol “REF.” These drawings may also include additional reference models such as tools and fixtures used in the assembly or installation step.

F. Schematic Drawings

Schematic drawings are non-dimensional drawings used to describe the function or operational characteristics of a system.

1. Piping & Instrumentation Diagrams (P&ID)

P&ID drawings shall be used to define the overall or portion of a piping system along with its integrated instrumentation and control system including gages, valves, etc.

2. Heating, Ventilation, and Air Conditioning (HVAC) Diagrams

HVAC diagrams shall be used to define the overall or portion of an HVAC system along with its integrated instrumentation and control system including gages, valves, dampers, etc.

3. Wiring Diagrams

Wiring schematic diagrams are engineering reference documents and are not used for fabrication. These diagrams use symbols and connecting lines to illustrate the electrical connection and function of a specific circuit arrangement. These drawings facilitate the tracing of circuits without regard to the actual size, shape or location of components, which are identified by reference designation and electrical values.

G. Specification Drawings

Specification drawings are intended to convey basic system features in support of an engineering/design specification document. These drawings shall include the same basic information as a part detail or assembly detail drawing, but may exclude a significant portion of dimensional data which will be provided by the manufacturer. After receipt of detailed manufacturer models or drawings, these specification drawings may be revised to be “AS-BUILT” to capture final details.




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H. Architectural, Structural, and Electrical Drawings

Architectural, structural, and electrical drawings shall follow ERDC/ITL TR-09-2, A/E/C CAD Standard, except where specific guidance is given in this Appendix.

I. Drawing Tree

A drawing tree is used to plan the development of drawings and their place in the overall scheme of the project. Although this type of drawing is not a requirement for each project, when used properly and kept up to date, it can be a valuable management aid and can be contained in a configuration management database. The use of a drawing tree shall be reviewed and approved by the Project Manager prior to creation.

II. FORMATS

A. Drawing Sizes

Drawing sizes shall be inherited from current ASME Y14.1, Decimal Inch Drawing Sheet Size and Format, and are reproduced here for reference. Only the sizes shown in Table 1 shall be used for new drawings. Other ASME sizes may be used upon Project Lead Engineer’s approval of drawing format.

Table 1. BGS Drawing Sizes

Letter

Designation Sheet Width

(inches) Sheet Length

(inches) Margin (inches)

ANSI A 11.0 8.5 0.50

ANSI B 11.0 17.0 0.50

ANSI C 17.0 22.0 0.50

ANSI D 22.0 34.0 0.50

ANSI E 34.0 44.0 0.50

B. Zoning

All drawings shall contain vertical and horizontal zones with markers as given in current ASME Y14.1 to provide orientation in the field of the drawing. All drawing format sizes shall include zones. These zones shall be referenced when adding a revision to a drawing to aid in the location of drawing revisions [for mechanical drawings only zoning conventions shall be used for locating sections, views, and details for drawings with remotely located (multi-sheet) sections, views, and details.] Zones shall be identified by alphabetical (uppercase) and numerical entries in the margin spaces.

C. Title & Revision Blocks




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Where appropriate, the title block shall contain tolerance standards, an approval list, the release state, the design authority(s), the drawing title, the format size, the drawing number, the drawing revision, the scale, the weight, and the number of sheets as shown in Figure 1.

Single part detail drawings shall have an additional material specification block attached to the left end of the title block. The title blocks and cells contained therein are proprietary and will be provided to the user. No changes or additions shall be made to these provided formats without written approval from the Program Manager. It is the responsibility of the engineer of record to verify that the correct and up to date formats and included title blocks and revision blocks are used. The title block shall be located in the bottom right hand corner of the format. On projects that use sensitive information, ensure document titles are reviewed by the proper security personnel as required.

Figure 1. Sample Title Block MODEL PREPARED IN ACCORDANCE WITH ASME Y14.41 ‐2012 DRAWING PREPARED IN ACCORDANCE WITH ASME Y14.100‐2004

DIMENSIONS ARE IN & UNITS

UNLESS OTHERWISE SPECIFIED DIMENSIONAL TOLERANCES ARE: LINEAR: X.X & linear_tol_0_0 X.XX & linear_tol_0_0 X.XXX & linear_tol_0_0 ANGLES & angular_tol_0_0

APPROVALS

ORIGINATOR

DATES

CHECKER

RESPONSIBLE ENGINEER

DESIGN LOCATION: & ORIGIN

PROJECT LEAD ENGINEER

TITLE:

PROJECT MANAGER

SIZE: DWG NO.: REV.:

PE Stamp (if applicable) PROFESSIONAL ENGINEER (PE) SCALE: WEIGHT: SHEET:

REL. STATE:

The revision block shall contain only the revision letter/number, the zone in which the change was made, the description, the design change request number, and the revision date, as shown in Figure 2. The revision block shall be located in the top right-hand corner of the format.

Figure 2. Sample Revision Block

REVISIONS

*REV *ZONE DESCRIPTION OF CHANGE CHANGE # DATE

D. Multi-sheet Drawings

Multi-sheet drawings are permitted on all sizes, provided the continuation sheets are the same size as the title sheet. The Revision Block on the first sheet of a multi-sheet drawing shall be the only location for recording the revision history.

The first sheet of a multi-sheet drawing shall always contain the complete Title Block, List of Material (if used), Revision Block, and general notes. All continuation sheets as a minimum shall contain the Drawing Number, Sheet Number, Revision Letter, Drawing Size, and Scale, in accordance with ASME Y14.1, Figures 6 and 7. All sheets of multi-sheet drawings shall have the same revision letter/number.




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III. CONTENT REQUIREMENTS

A. Drawing Title

a) The title should be as brief as possible but should contain sufficient information to categorize the drawing properly and to distinguish it from other similar drawings.

b) The drawing title shall consist of the following:

1. Identifying noun or noun phrase.

2. The most significant modifier or modifying phrase.

3. The next most significant modifier or modifying phrase.

a. The noun or noun phrase establishes a basic concept of an item and is never abbreviated. The modifiers serve to narrow the area of concept established by the basic name. Abbreviations are used in the modifiers only when space is limited. Examples of drawing titles are given in ASME Y14.100, section 5.2.

c) When one drawing supersedes another, the new drawing, when practical, shall have the same title.

d) Parentheses shall not be used to enclose any portion of the drawing title.

B. Material Specifications (Mechanical)

Detailed part drawings shall have the material identified by the following information:

MATERIAL NAME – This would be the Unified Numbering System (UNS) designated metal for example.

MATERIAL DESCRIPTION – This would be the unique physical characteristics.

MATERIAL CONDITION – This would be the heat treat, hardness or durometer.

MATERIAL SPECIFICATION – This would be the governing standard for the material.

C. Approval List

The drawing approval sequence shall be completed in compliance with Section 7.4 of this procedure. The Originator shall type his/her name and date of printing in the first row in order to identify the ownership and origination date of the drawing.

D. Abbreviations

Where appropriate, when abbreviations are necessary to save space, they shall conform to those found in ASME Y14.38-2007, Abbreviations and Acronyms for Use on Drawings and Related Documents. Abbreviations should be used only to save space or time, but never at the expense of clarity. Abbreviations for word combinations (e.g., MMC—Maximum Material Condition) shall be used as such and shall not be separated for use individually. Single abbreviations may be combined when necessary.




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E. Assembly Parts List (Mechanical)

The Parts List shall contain the following items as shown below in and described in the following sections.

Figure 3. Sample Parts List

ITEM PART NUMBER DECRIPTION or

NOMENCLATURE MATERIAL /

SPECIFICATION QTY PARTS LIST

1. Item Number (Mechanical)

A unique sequential ITEM number (“Find Number”) shall be assigned to each part in the list to aid in the location of the listed part in the drawing view(s) in the field of the drawing.

Each ITEM listed in an Assembly Parts List shall be identified only once by a corresponding item number balloon on the body of the drawing. Additional reference item balloons may be placed on additional views as needed for reference purposes using the suffix “REF”.

Balloons shall indicate both the item number and the quantity within the symbol. Where balloons use a common leader such as a nut-bolt-washer combination, a grouped multiplier may be used to indicate replication.

When necessary for illustration purposes, reference parts may be shown in phantom line with the detailed assembly. These parts shall not appear in the Parts List, but shall be noted by part number in the drawing field with the suffix “REF”. For example:

2. Quantity

The quantity or QTY shall indicate the total number of an item used on an assembly. Where bulk items are used, the quantity shall read “AR” to indicate “As Required”.

3. Part Number

Refer to Section IV.

4. Description

The DESCRIPTION shall be the noun name assigned to the part (excluding material) and shall be equal to the common name for the part in the database. Follow title naming rules set forth in this Appendix.

5. Material

The MATERIAL shall be the material name assigned to the part. If the part or component is detailed on another drawing, the field shall be left blank.

BGS-DWG-PP-XX-YYREF




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6. Specification

The SPECIFICATION shall be the specifications used to define the manufacturing of a component. For space savings, the SPECIFICATION information shall be shown in a stack under the MATERIAL parameter in the far right column. If the part or component is detailed on another drawing, the field shall be blanked. If the part is a vendor supplied item, the field shall indicate the vendor name and contact information.

F. Views (Mechanical)

Views that depict physical configurations shall conform to ASME Y14.3, Multiview and Sectional View Drawings, where appropriate, drawings shall have one isometric pictorial view, scaled to fit the space directly below the revision block in accordance with ASME Y14.4, Pictorial Drawing. ASME Y14.3 gives a thorough explanation of all drawing views, but below is a summary of the most commonly used drawing view types and how they are treated.

1. Principal Views

There are six principal views: top, front, bottom, right, left, and rear (back).

2. Projection Views

Projection views are those which are third-angle orthogonal projections of a principal view and as such do not require labeling. However, the principal view from which a projection is taken shall have a view label for reader orientation. For example, the main view may be labeled “FRONT VIEW” and the projections from this main view are implied by third-angle projection.

3. Sectional Views

Sectional views are those which depict a cross-sectional cutting plane or offset cutting planes through one of the principal views. They shall be identified at their origin by the cutting plane lines and arrows in accordance with ASME Y14.3 and shall be identified by a reference title such as “SECTION A-A”.

4. Removed Views

Removed (transported) views are those which are not direct projections of the main view on the same sheet. Examples include Projection, Sectional, or Detail Views that have been moved to a continuation sheet. Removed Projection Views shall be identified at their origin by the cutting plane lines and letters similar to section views and shall be identified by a reference title such as “VIEW D-D”.

A removed view and its origin shall be bi-directionally referenced using zoning.

5. Detail Views

A detail is a partial view which shows a portion of another view in the same plane and will usually depict greater detail. If detail views are rotated for clarity, a view note shall be provided indicating the shown orientation such as “ROTATED 90°




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CCW”. If detail views are scaled up from the origin view, a note shall indicate the absolute scale of the detailed view.

6. Identification of Views

All views shall be named in .25” capital, underlined, bold letters beneath the view, except for direct 3rd angle projections from the main view.

Sectional and Removed views shall be identified by Capital Letters excluding the letters “I”, “O”, “Q”, “S”, “X”, and “Z” in accordance with ASME Y14.3. Detail views shall be identified by Arabic Numerals. A view identification shall not be used for another section, view, or detail on the same drawing.

Detail views shall be identified by Arabic Numerals to differentiate them from sectional and transported views. These shall begin with 1 and continue sequentially.

G. Dimensioning & Tolerancing

Dimensioning and Tolerancing shall conform to current ASME Y14.5-2009, Dimensioning and Tolerancing, for mechanical drawings and ERDC/ITL TR-09-2, A/E/C CAD Standard, for architectural and structural drawings.

Dimensions shall be given in the field of the drawing for all features of a component or assembly, except for commercial-of-the-shelf items such as fasteners. Stock sizes of raw materials such as pipe, tubing, and structural members shall not be given in the parts list. For non-mechanical drawings, the Dimensioning and Tolerancing block may be omitted.

H. Notes

1. Types of Notes

There shall be two types of notes, general notes and field notes. General notes which include manufacturing, cleaning, marking, and packaging specifications/ requirements, and other non-feature-specific information shall be included in paragraph format in the field of the drawing. These shall be listed in ascending numerical order beginning with “1.” If it becomes necessary to continue notes to an additional column or sheet, the numbers shall be paginated to retain the overall sequence of notes.

Field notes shall be used when feature-specific details are to be identified on the views of the drawing. All notes should, whenever possible, originate from a 3D model to insure integrity of design intent.

2. Note Locations (Mechanical)

General notes shall be placed in the upper left quadrant of the drawing field to the left of all views and shall continue downward. Paginated notes shall be continued to the right of the original paragraph of notes. In special circumstances it is permissible to relocate the general notes to make room for special views, but this should only be done if absolutely necessary. In all circumstances, the general notes should begin on the first sheet of multi-sheet drawing.




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Field notes shall be attached (grouped) to the associated feature or view as appropriate to maintain the integrity of the association.

When a field note is too large to place adjacent to the associated feature, it shall be placed in the numbered general notes. The numbers for these notes shall be circumscribed with a rectangular box and the field note shall read “SEE NOTE XX”, where XX is the note number. These are commonly referred to as Flag Notes.

I. Revisions

Drawing revision history shall be documented in the revision block only. The revision block shall include; a) REV for identifying the revision letter or number of the change; b) ZONE for identifying the location of the change; c) DESCRIPTION for identifying the change(s) made to the drawing; and d) DATE for identifying the actual date that the change was made on the drawing. Note that the description of change should be brief and that the details of a change affecting a configuration controlled drawing or document shall be captured in the Design Change Request per BGS-EN-08, Design Change Request, and shall be noted in the description of change. A sample of the revision block is given in Figure 2 of this Appendix.

The revision level of the drawing shall be indicated by revision letters or numbers. When letters are used, they shall be upper case letters used in alphabetical order beginning with A, and shall not contain the letters I, O, Q, S, X, or Z. Configuration controlled drawings shall use Arabic Numerals beginning with “0” to identify the revision level.

When performing a drawing revision, all of the approval block data shall be erased and re-entered as with the original document. This is to signify that all of the original checks and approvals have been repeated for the revision.

The current revision level shall be indicated in the “REV” cell of the title block to the right of the drawing number cell. For configuration controlled drawings that have undergone a drawing change approval, both the current and previous revisions shall be noted in the revision block along with the associated change document number.

J. Lines & Lettering (Mechanical)

Line conventions and lettering shall conform to current ASME Y14.2, Line Conventions and Lettering.

K. Symbols

In order to convey certain types of technical information, to assist in the navigation of drawings, and to maintain consistency, the application of symbols on the field of the drawing shall be as follows:

a) Note Markers (when used) shall be squares.*

b) Welding symbols shall comply with AWS A2.4, Standard Symbols for Welding, Brazing, and Nondestructive Examination.

c) Surface symbols shall comply with ASME Y14.36M, Surface Texture Symbols.

d) Electrical symbols shall comply with ANSI/ISA 5.1-2009, Instrumentation Symbols and Identification.




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e) Piping symbols shall comply with ISO 1219-1-2012, Fluid power systems and components – Graphical symbols and circuit diagrams – Part 1: Graphical symbols for conventional use and data-processing applications, and ISO 1219-2, Fluid power systems and components – Graphic symbols and circuit diagrams – Part 2: Circuit diagrams.

f) P&ID instrument symbols shall comply with ANSI/ISA 5.1-2009, Instrumentation Symbols and Identification.

Note

When field notes exceed the available space on the drawing field, a detailed note may be added to the general notes and designated by circumscribing a square around the note number. A corresponding note marker shall be placed at the field note location with the same square circumscribed note number.

IV. NUMBERING SYSTEM

All BGS drawings shall be assigned a unique number in accordance with Step 7.2.1 of this procedure. The number of the part or assembly depicted on the drawing shall match the drawing number with exceptions as follows:

A. Inseparable Assemblies

An Inseparable Assembly drawing depicts parts permanently fastened together. In this case, the assembly number shall match the drawing number. The individual parts in the assembly shall be designated by the assembly number followed by a two-digit dash number beginning with “-01”. Parts that will be re-used on other assemblies may be given a unique number, provided those parts are detailed elsewhere.

B. Standard Parts

For standardized fasteners, the part numbering shall follow ASME B18.24, Part Identifying Number (PIN) Code System Standard for B18 Fastener Products. An item covered by other approved standards and used without alteration shall be identified by the proper standard number (such as MS number for military standard), which shall include any dash number or code necessary for complete identity.

C. Vendor Supplied Parts

Vendor-designed and manufactured parts or assemblies shall be identified by the vendor's part number, provided that the part is adequately detailed and the source of the part is given in the “SPECIFICATION” parameter field. Altered vendor parts shall be given a unique number and shall be detailed with a matching BGS drawing.

D. Opposite Parts

Symmetrically opposite parts shall be designated by a unique number.

E. Order of Precedence (Mechanical)

The order of precedence for information is as follows in order of decreasing control:




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1. Interface Control Drawings

2. Detailed Part Drawings

3. Assembly Drawings

4. Internal Specifications

5. Internal Standards

6. Vendor Specifications

V. DOCUMENTATION MANAGEMENT

All drawings and associated documents should be managed and retained in a digital content database, if possible. For work in progress, digital data will be stored and retrieved from a relational database which will manage the associatively of all related drawings and documents. When a drawing has been approved, it will be placed in a .pdf rendition and entered into the electronic records management system.