Attachment 2 - Drawing Development and Revision.pdf

Military Sealift Command Managers’ Internal Control- Quality Management System

Procedure

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Endorsed by the Engineering Steering Committee

Issued By: Date:

9 June 2022 SSIC: 9085

Andrew J. Busk Engineering Director

DRAWING DEVELOPMENT AND REVISION

REFERENCES:

(a) COMSCINST 4700.1A MSC Technical Authority, Standards and Policy

(b) ASME Y-14.100 (Series), Engineering Drawing Practices

(c) TMINS S9040-AA-IDX-020/SWBS 5D, Naval Sea Systems Command's Ship Work

Breakdown Structure

(d) MIL-STD-25, Ship Structural Symbols for Use on Ship Drawings

(e) IEEE STD 315, Graphic Symbols for Electrical and Electronics Diagrams and supplement ANSI/IEEE 314a

(f) ASTM F 1000, ASTM F 856 and ASME Y32.2.6 (as applicable), Mechanical and Piping

Symbols

(g) ASME Y14.38, Abbreviations and Acronyms for Use on Drawings and Related

Documents

(h) N0700-001.00-Q, Technical Data Control

(i) N0721-003.00-AQ, Weight and Stability Control

(j) MIL-HDBK-299, Cable Comparison Handbook, Data Pertaining to Electric Shipboard

Cables

1 PURPOSE: To implement the policy of reference (a), COMSCINST 4700.1A, Technical Authority by establishing procedures for development and revision of drawings that support MSC’s fleet and uniform criteria for drawing format and content.

2 SUPERSESSION: This procedure supersedes MSC Drawing 803-7080803 “Preparation of Computer Aided Designed (CAD) Drawings” and N0752-001-00-P “Drawing Development and Review,” each document will be cancelled when all ongoing contracts citing the document are completed.

3 BACKGROUND, OBJECTIVES and APPLICABILITY:

3.1 Background. Drawings that support MSC ships are developed by many sources including MSC N7, Operating Companies (OPCOs), ship sponsors and design agents.

MSC Managers’ Internal Control-Quality Management System Procedure

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3.2 Objective. The objective of this procedure is to provide a common standard for MSC N7 engineers, OPCOs, ship sponsors, industrial activities and design agents that develop or revise drawings in support of MSC ships. Standard drawing types, format and revision methodology improves consistency and quality, and reduces the time and cost of drawing development and review.

3.3 Applicability. The requirements of this procedure apply to all new drawings developed for MSC ships, both Government Owned/ Government Operated (GOGO) and Government Owned/ Contractor Operated (GOCO). These are minimum requirements.

Additional requirements may be included in the task statement. For revision to existing drawings, these requirements apply to the revised portion only, unless the task statement requires complete redrawing. Reference (b) should be used in absence of guidance herein or per reference. The requirements of this procedure do not apply to vendor drawings, equipment drawings or NAVSEA standard drawings used in a work package.

4 PROCEDURES & PROCESSES:

4.1 Drawing Types. There are four types of drawings developed and revised for MSC ships:

4.1.1 Contract Guidance Drawings (CGD)

4.1.2 As Built Drawings (ABD)

4.1.3 Selected Record Drawings (SRD)

4.1.4 Selected Record Drawing - Markups (SRD-M)

4.2 Contract Guidance Drawings (CGD). Contract Guidance drawings are commonly referred to as Transportation Alteration (TRANSALT) drawings and were formerly called Functional Design Drawings (FDDs).

4.2.1 CGDs are developed in support of work items, which task an industrial activity to accomplish specific work. CGDs are referenced in the work item and provided as guidance.

4.2.2 CGDs are prepared by design engineers and are discipline specific.

4.2.3 CGDs provide adequate technical information, details and performance requirements necessary to obtain regulatory body approval of the functional design. However, they are not intended to be overly restrictive. Equivalent details and procedures that make use of more readily available material or permit the use of an industrial activity’s standards or procedures of equal merit are acceptable with the prior written approval of the government’s technical representative.

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4.2.4 Together with the T-ALT specification package, CGDs have adequate information and detail for industrial activities to estimate, plan and execute work requirements.

They do not necessarily describe all work required to meet regulatory body requirements.

4.2.5 When an installation requires a high level of precision, a tolerance is included, or the applicable view is marked “No Deviations”.

4.2.6 CGDs are typically applicable to multiple ships in a class but based on the ship check of a single ship. Therefore a ship’s as-found condition could require the industrial activity to tailor the work.

4.2.7 CGDs are approved through the TRANSALT-PM Module of MSC’s

Shipboard Automated Maintenance Module (SAMM) and by regulatory bodies (when required).

4.3 As-Built Drawings (ABDs).

4.3.1 ABDs are prepared by industrial activities to document the final, ship specific, as-built configuration changes made by a T-ALT.

4.3.2 ABDs are derived from CGDs and assigned unique MSC drawing numbers by the MSC Technical Library.

4.4 Selected Record Drawings (SRDs).

4.4.1 SRDs are ship specific drawings that document important features and systems. In most cases, they were initially developed by the shipyard that built the ship.

Examples include general arrangements and system diagrams.

4.4.2 SRDs provide Ships Force, Administrative Commanders and Contract

Operators of MSC ships an accurate depiction of the ship’s configuration for safe and efficient operation.

4.4.3 SRDs provide shore side personnel an accurate depiction of the ship’s configuration to support maintenance, repair and alteration planning.

4.4.4 SRDs are periodically revised to reflect changes to a ships configuration.

They are not revised concurrent with each alteration unless required by regulatory bodies (ex.

Fire Control Plans).

4.4.5 SRD revisions document configuration changes that have already been approved by the appropriate technical authority, therefore most are “accepted” by MSC N7 rather than approved. SRDs that include calculations or operational procedures may require approval by N72 or regulatory bodies. These will be identified in tasking statements. (ex. Trim & Stability Booklets).

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4.5 Selected Record Drawing Markup (SRD-M).

4.5.1 SRD Markups highlight additions, deletions, and configuration changes resulting from alterations. They are typically based on a tabletop review of ABDs and/or a ship check. They are retained to be incorporated into formal SRD revisions at a later time.

4.6 Drawing Templates.

4.6.1 Templates, when available, must be the starting point for all new CGD and SRDs and can be obtained from the MSC Technical Library or the N7 Project Lead. Templates contain the minimum requirements. Additional requirements may be contained in the tasking statement.

4.6.2 Available templates are listed below.

DWG

TYPE

DWG NO. TITLE SIZE

CGD 085-8616080 CONTRACT GUIDANCE DRAWING (CGD)

TEMPLATE (US UNITS)

F

CGD 085-8616081 CONTRACT GUIDANCE DRAWING (CGD)

TEMPLATE (METRIC)

F

CGD 085-8616082 CONTRACT GUIDANCE DRAWING (CGD)

STRUCTURE ALTERATION TEMPLATE (US UNITS)

F

CGD 085-8616083 CONTRACT GUIDANCE DRAWING (CGD)

STRUCTURE ALTERATION TEMPLATE (METRIC)

F

CGD 085-8616084 CONTRACT GUIDANCE DRAWING (CGD) PIPING

ALTERATION TEMPLATE (US UNITS)

F

CGD 085-8616085 CONTRACT GUIDANCE DRAWING (CGD) PIPING

ALTERATION TEMPLATE (METRIC)

F

CGD 085-8616086 CONTRACT GUIDANCE DRAWING (CGD) HVAC

ALTERATION TEMPLATE (US UNITS)

F

CGD 085-8616087 CONTRACT GUIDANCE DRAWING (CGD) HVAC

ALTERATION TEMPLATE (METRIC)

F

CGD 085-8616088 CONTRACT GUIDANCE DRAWING (CGD)

ELECTRICAL ALTERATION TEMPLATE

F

SRD 085-8616089 SELECTED RECORD DRAWING (SRD) TEMPLATE

(US UNITS)

F

SRD 085-8616090 SELECTED RECORD DRAWING (SRD) TEMPLATE

(METRIC)

F

SRD 085-8616091 SELECTED RECORD DRAWING (SRD) TEMPLATE

(US UNITS/SIZE H)

H

SRD 085-8616092 SELECTED RECORD DRAWING (SRD) TEMPLATE

(METRIC/SIZE H)

H

CGD/

SRD

085-8616093 CGD/SRD BOOKLET TEMPLATE A/B

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4.7 Drawing Format.

4.7.1 CAD Drawings:

4.7.1.1 All CAD drawing final submissions must include both a .pdf and a .dwg file in the version of AutoCAD used to create the drawing. If the .dwg file is not backward compatible with AutoCAD 2021©, a second .dwg file is required that is compatible.

The PDF version must be in full scale format to allow full size printing.

4.7.1.2 Drawing file names must use the seven-digit drawing number, revision and AutoCad version (example; 8499221_A (2021).dwg and 8499221_A.pdf).

4.7.1.3 When tables or text are imported into a CAD drawing, the original files in their native format must be included in a zip file with the .dwg.

4.7.1.4 All AutoCAD© drawings must use only AutoCAD© standard menus, line types and fonts as supported by a standard AutoCAD© installation. Custom menus, unique line types, etc. are not permitted.

4.7.1.5 AutoCAD SHX Text must be turned off in the .dwg file prior to plotting, publishing or exporting to PDF.

4.7.1.6 All drawings made using the AutoCAD XREF feature must have all the XREFs bound into the drawing prior to delivery.

4.7.1.7 Subject geometry must be produced in full size (1:1 Scale) in model space. Text, dimensioning, annotations, piece numbers, part callouts, etc. must be produced in the paper space layout. Each sheet of the drawing must be on a separate tab in paper space.

4.7.1.8 MSC drawings must be published in black on white background unless otherwise specified in the task statement. Examples of typical exclusions to this requirement are Fire Control Plans and Damage Control Display Plans, which are published in color on white background.

4.7.2 Standard Drawing Sizes:

4.7.2.1 Unless otherwise specified in the tasking statement, SRDs, CGDs

& ABDs must be developed as ANSI size F, and legibly printed on size B paper. Size H must be used only when the requirement for complete decks to be shown without breaks and at legible scales makes the use of size H unavoidable. When the size H template is used, the width must be adjusted to suit the content.

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4.7.2.2 All sheets in multiple sheet drawings must be the same size with the exception of Size A SRD booklets that use Size B sheets to accommodate insertion of detailed tables or figures.

4.7.3 Dimensions:

4.7.3.1 Drawings for ships designed using the International System of

Units (SI) must be developed and dimensioned using SI units; drawings for ships designed using US units must use US units. Dimensions in SI drawings must be in millimeters and dimensions in US units drawings must be in inches for lengths up to sixty (60) inches, and feet and inches for lengths over five (5) feet.

4.7.3.2 Exceptions are acceptable in the List of Materials. For example, if an angle stiffener that was originally rolled and dimensioned in US units is used in a structural alteration of an SI designed ship, the angle must retain its US dimensions instead of artificially defining it in SI units with a hard conversion.

4.7.4 Text Selection:

4.7.4.1 Text in CAD drawings must match the font and sizes modeled in the templates. The template font is a TrueType (TT) romans.shx font to ensure searchable text functionality when converted to PDF format.

4.7.4.2 Text, including text in tables and lists must be multiline-text

(MTEXT).

4.7.4.3 Leaders for text should be attached at the middle of the top line of text unless it hinders legibility in which case they may be attached where they best fit.

4.7.4.4 Text in SRD Booklets (size A) developed in .doc or .xls must be

Times New Roman or Arial, font size 12. Font size 10 may be used in tables.

ANSI size Length x width (inches)

A (Portrait) 11 x 8.5

A (Landscape) 8.5 x 11

B 11x 17

F 28 x 40

H 28 x 44-143

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4.7.5 Layer Color and Line Type Conventions:

4.7.5.1 All CAD drawings must be drawn on a black background.

However, the use of color enhances both the CAD operator’s and end user’s ability to follow and understand the information contained on the CAD file. The use of colors must not result in illegible information upon conversion to white background PDF or printing on white paper. The use of the color yellow is prohibited except for the Centerline Layer and where required by regulatory bodies (ex: B-Class bulkheads and some symbols on Fire Control Plans).

4.7.5.2 Separate layers, colors and line types must be used to separate entities in drawings both to make them easier to identify and to make the future modification of drawings simpler. Layers required on all drawings and examples of additional layers that are subject dependent are shown below. When additional layers are required, color and line types selected must be easily differentiated from the standard layers.

REQUIRED CAD LAYERS

LAYER COLOR LINE TYPE DESCRIPTION

0 WHITE (NO. 7) CONTINUOUS AutoCAD Default, Blocks are Permitted

FORMAT (Title Block & Border) WHITE (NO. 7) CONTINUOUS Title Blocks, Borders, Tables, References and Notes

TEXT WHITE (NO. 7) CONTINUOUS Reference Text, Titles, Drawing Numbers, Revision Text, Title Block Text

CENTERLINE YELLOW (NO. 2) CENTER Centerline of Ship, Middle Line of Equipment

ADDITIONAL CAD LAYERS

LAYER COLOR LINE TYPE LINE WEIGHT

STRUCTURE or SHIP (Bulkheads, Decks, etc.)

(EXISTING)

WHITE (NO. 7) PHANTOM 0.00

STRUCTURE (NEW) WHITE (NO. 7) CONTINUOUS 0.18

FURNITURE (EXISTING) CYAN (NO. 4) PHANTOM 0.18

EQUIPMENT (EXISTING) GREEN (NO. 3) PHANTOM 0.18

ELECTRICAL (EXISTING) CYAN (NO.4) DASHED 0.18

EQUIPMENT, CABLE OR

COMPONENTS (NEW) MAGENTA (NO. 6) CONTINUOUS 0.35

FLUID SYSTEMS

(EXISTING) CYAN (NO. 4) PHANTOM 0.18

FLUID SYSTEMS (NEW) MAGENTA (NO. 6) CONTINUOUS 0.35

DIMENSIONING RED (NO. 1) CONTINUOUS 0.18

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4.7.6 Non-CAD Drawings. Some drawings are better suited for development in Booklet format, using MS Word or Excel. These Booklets must use the Size A or B Booklet Template which includes the cover sheet and applicable drawing elements. When a Booklet includes figures and tables, final delivery must include both a .pdf file and a zip file containing the document, all figures and tables in their original formats (.doc, .xls, .dwg, .vsdx etc) compatible with MS Office 2016 for retention and future revision.

4.8 Required Drawing Elements.

4.8.1 Required elements are listed below. They are further defined in Sections 4.9 to 4.12 and samples are included in the templates.

4.8.2 CAD Required Drawing Elements (See Section 4.9):

a. Title Block

b. MSC Signature Block

c. Contractor Approval Block (when applicable)

d. Drawing Border and Zone Markings

e. Reference Block

f. General Notes (GNs)

g. Revision Block

h. List of Symbols

i. List of Abbreviations

j. Distribution Statement

k. Controlled Unclassified Information (CUI) Markings

l. Scale Bar (when applicable)

m. Reservations (when applicable)

4.8.3 CGD Required Drawing Elements - All Disciplines (See Section 4.10):

a. MSC CGD Approval Block

b. List of Applicable Ships

c. Ship Key View

d. List of Material Installed

e. List of Material Removed

f. Plan, Elevation and Sections Views

g. Details

h. Weight Control Data Table

i. Nameplate Table & Detail

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4.8.4 CGD Discipline Specific Required Drawing Elements (See Section 4.11):

a. System Design Data Table

b. Pump Data Table

c. Pump Curves

d. Fan Data Table

e. Heater Data Table

f. Cooling Coil Data Table

g. Fan Coil Unit Data Table

h. Filter Data Table

i. Voltage Drop Table

j. Electric Plant Distribution Impact Data Table

k. Cable Tag Designation Table and Detail

l. Block Diagram

m. Wiring Diagram

n. Controller Schematics and Description of Operation

o. Time Current Characteristic Curves Plan Views

4.8.5 SRD Required Drawing Elements (See Section 4.12):

a. MSC SRD Acceptance Block

b. T-ALT Completion Block

c. Revision Status of Sheets Block (when required by task statement)

4.9 CAD Required Drawing Elements.

4.9.1 Title Block: A Title Block identifying the class for drawings that have an

‘Applicable Ship’ block, or the ship for ship-specific drawings is required on the first sheet of every drawing. Additional sheets are required to have a Continuation Sheet Title Block.

Sample Title Block (1st Sheet)

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a. Title:

Titles for new drawings must be approved by the N7 Project Lead.

CGDs: The first line must be the T-ALT number (ex: “T-ALT 19-

00X”).

SRDs: The first line must be “SELECTED RECORD DRAWING”.

ABDs: The first line must be identical to the associated CGD with AS-

BUILT added (ex: “T-ALT 19-00X AS-BUILT”.

SRD Markups: The first line must be “SRD MARKUP”.

The second line of all drawing types must be brief and contain sufficient information to categorize the drawing and to distinguish it from similar drawings. The third line may contain a subtitle for clarity.

b. SWBS Number:

Ship Work Breakdown Structure (SWBS) is a hierarchical set of numbers used to identify ship configuration by functional group, sub-group and element. For example; Group 300 is Electric Plant, Sub-group 330 is Lighting System, and Element 331 is Lighting Fixtures. A complete listing of SWBS numbers can be found in reference (c).

SWBS numbers selected for a drawing must be SWBS Sub-groups or SWBS elements. For example, SWBS 331 (Lighting Distribution) and SWBS 332 (Lighting Fixtures) may be separate drawings or may be combined into an SWBS 330 (Lighting System) drawing, but SWBS 52X (Sea Water Systems) must not be combined with SWBS 53X (Fresh Water Systems) into an SWBS 500 (Auxiliary Systems) Drawing.

Sample Title Block (Continuation Sheet)

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c. Drawing Number: The seven-digit drawing number is assigned by the MSC Technical Library.

d. Revision: When any one sheet of a drawing is revised, the revision on all sheets must be up-reved. (See Section 4.12.3 for exception).

e. Scale: If the drawing is not drawn to scale, “None” must be entered.

f. Drawing Type: See Section 4.1.

g. Sheet Numbers: The first sheet is numbered “Sheet 1 of X,” where X is the total number of sheets. Insert sheets must be labeled with a capital letter after the number. For example, insert sheet 2A. For this reason, the total number of sheets can be different than the actual last page number used.

4.9.2 MSC Signature Block: This block is located to the left of the Title Block.

See Section 4.10.1 for the CGD Approval Block and Section 4.12.1 for the SRD Acceptance Block.

4.9.3 Contractor Approval Block (as applicable): Drawings developed or revised by Contractors must include a block to the left of the MSC Signature Block. For SRDs, this block is changed on each revision. It must include:

a. Company name & location

b. Contract and task identifier

c. Names (F. Last) of contractor personnel drawing, reviewing and approving the drawing for delivery to MSC with applicable dates.

4.9.4 Drawing Border and Zone Markings:

a. When more sheets are required than available in a template, zones on continuation sheets must be sequentially numbered. For example, the second sheet of an F size drawing starts with zone 9-A in the bottom right corner, sheet 3 starts with zone 17-A.

b. When an insert sheet is added during a revision, the insert sheet must have alphabetic zone designators continuing the lettering scheme of the sheet it is inserted after. For example, if sheet 3 is zoned 17-A through 24-F, then insert sheet 3A will be zoned 17-G through 24-L.

4.9.5 Reference Block:

a. Only references called out in the drawing are to be included.

b. CGD references are often SRDs depicting existing structure and systems which are being tied into by the subject alteration.

c. When referencing SRDs, the revision should be included. When referencing CGDs in the same T-ALT specification package, the revision should not be included.

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4.9.6 General Notes (GNs):

a. Required General Notes for CGD drawings are included in the templates, and must be tailored as necessary to the specific ship class and drawing purpose.

b. General Notes should not include tasking statements.

c. General Notes should not duplicate content of the General Technical

Requirement (GTR) or the associated Work Item (WI).

d. Specific notes applicable to drawing details should be referred to at the detail location(s) to which they apply (“GN 12”). However, general notes which are broadly applicable to the drawing need not be referenced in the body of the drawing.

4.9.7 Revision Block:

REVISIONS

REV NO. ZONE DESCRIPTION DATE TPOC

A 1

1-B 20-D 22-D

ADDED REFERENCE 3

CHANGED DETAIL TO REFLECT…

ADDED GENERAL NOTES 3 & 4

MM/DD/YY F. LAST

B 1 6-E CHANGED PART NO. 16 MM/DD/YY F. LAST

a. The revision block must separately list every change. Statements such as

“Updated throughout to reflect configuration found during ship check” must not be used.

b. Each change must be numbered, identify the zone(s) impacted, and include a brief description. The changes must be described in the form of "added…", "deleted…", "modified…", "changed…", "corrected…", etc.

Each entry must provide sufficient information for a drawing reviewer or user to understand what was changed.

c. For a CGD, the last two columns are used to show the N7 TPOC’s acceptance of the revision (approvals are done through SAMM TRANSALT PM). For an SRD, the last column is ‘BY’ and is used to identify the company that prepared each revision. The text in these columns may be entered vertically.

4.9.8 List of Symbols:

a. All symbols used in MSC AutoCAD drawings must be inserted into the drawing as a block with a unique block name. All symbols, including standard symbols, must be defined in the List of Symbols.

b. Symbols used in structural drawings must be per reference (d).

c. Symbols used in electrical drawings must be per reference (e).

d. Symbols used in mechanical drawings must be per reference (f).

e. Additional unique symbols may be added to drawings as circumstances warrant, but symbols not used in the drawing must not be included.

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4.9.9 List of Abbreviations:

a. The List of Abbreviations must include all abbreviations used in the drawing (except units and column headings in discipline specific design calculation tables) and be in alphabetical order.

b. Abbreviations must be consistent with reference (g) when they are included.

c. Abbreviations not used in the drawing must not be included in the list.

4.9.10 Distribution Statement: All drawings must be marked with a Distribution Statement following reference (h), using the date of the reference as the ‘Date of Determination’.

4.9.11 Controlled Unclassified Information (CUI) Markings: All drawings must have CUI markings as shown on the templates, unless the TPOC provides additional marking requirements.

4.9.12 Scale Bar:

a. Reproduction scale bars must be shown on each sheet of scaled drawings to assist users working with reduced size and odd size prints.

b. A 10 ft (3 m) scale bar must be added to arrangement drawings showing only one or two compartments; a 50 ft (15 m) scale bar must be added to arrangement drawings showing a large portion of a deck, such as General Arrangement drawings.

c. Electrical drawings must not be to scale unless specific dimensions are required (e.g. elevation or section views) for mounting or location purposes.

4.9.13 Reservations:

a. A reservation is used during drawing development to identify items that need to be verified by ship check, are awaiting vendor information or additional Government Furnished Information (GFI).

b. A cloud containing the reservation Number must be used to identify where each reservation applies in the body of the drawing.

c. All reservations must be cleared before final submittal of the drawing.

Sample Reservation Block

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4.10 CGD Required Drawing Elements: All Disciplines.

4.10.1 CGD Approval Block:

a. The CGD Approval Block is used to identify the engineers that reviewed contractor prepared drawings, or prepared and reviewed drawings developed within N7 prior to ABS review or upload to SAMM

TRANSALT PM.

b. Revisions to CGDs are not approved, but accepted by the N7 Project Lead in the Revision Block (See Section 4.9.7).

MSC APPROVAL MSC APPROVAL

REVIEWED BY:

MM/DD/YY

PREPARED BY:

MM/DD/YY F. LAST F. LAST

N7 CODE/TITLE N7 CODE/TITLE

REVIEWED BY:

MM/DD/YY

REVIEWED BY:

MM/DD/YY F. LAST F. LAST

N7 CODE/TITLE N7 CODE/TITLE

APPROVED THROUGH SAMM

TRANSALT PM

APPROVED THROUGH SAMM

TRANSALT PM

CGD Developed by Contractors CGD Developed by N7

4.10.2 List of Applicable Ships:

a. This list must include both the hull number and ship name.

b. ABS approval is limited to the ships on this list.

4.10.3 Ship Key View (SKV): The SKV must be included to orient the user to the areas that are impacted by the alteration. The SKV is typically a ship’s inboard profile or a partial deck plan. The SKV must label the spaces impacted and include cross-references to relevant removal and installation views.

Sample Reservation Cloud

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4.10.4 List of New Material to be Installed: The List of Material Installed is a list of all new parts and materials called out in the drawing.

LIST OF NEW MATERIAL TO BE INSTALLED

ITEM QTY UNITS DESCRIPTION MATERIAL

SPEC MFR

NSN OR

MFR PART

NO

STANDARD SCE UNIT

WT

REMARKS/ SALIENT

CHARACTERISTICS

a. ITEM: Also known as a “Find” number, this number is assigned to each part or subassembly for the purpose of locating the part in the body of the drawing. Material is typically identified with numbers, but may be grouped into categories with an alphanumeric item for clarity. For example, Piping (P-#), Valves (V-#), and Fittings (F-#) could be used in a piping drawing. Where categories are used, the convention must be P-1, P-2, P-3 etc. Numbers must be sequential and must not be skipped on Rev

- drawings.

b. QTY: Quantity required to complete the installation

c. UNITS: Example; meters, square meters, each

d. DESCRIPTION: Common name

e. MAT’L SPEC

f. MANUFACTURER: Manufacturer/Vendor/ Supplier

g. NSN/MFR PART NO.: Enter identifying part number when applicable.

h. STANDARD: Enter the Design Standard, including regulatory requirements to be met.

i. SCE: Enter applicable Supply Chain Execution.

Government Furnished Material or Equipment (GFM or GFE) Contractor Furnished Material or Equipment (CFM or CFE) Fabricated (FAB) include reference or “See Sheet X, View X”

j. REMARKS/SALIENT CHARACTERISTICS:

Salient characteristics must be sufficient to support procurement of ‘or equal’ equipment.

Remarks include:

– Exceptions, deviations or alterations to standard equipment

– Reference to detail for fabricated items

– Accessories that must be procured with equipment.

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4.10.5 List of Material to be Removed:

LIST OF MATERIAL TO BE REMOVED

ITEM QTY UNITS DESCRIPTION DISPOSITION REMARKS SCRAP MSC REP RETAIN

R-1 1 EA X

a. ITEM: Also known as “Find” numbers, these are assigned to items being removed for the purpose of locating the item in the drawing. They must be preceded by the letter R notating removal (e.g. R-1). Numbers must be sequential and must not be skipped on Rev – drawings.

b. QTY: Enter quantity required to be removed

c. UNITS: Examples; EA, SF OR LF

d. DESCRIPTION: Common name (ex. Centrifugal pump).

e. DISPOSITION: SCRAP, MSC REP or RETAIN (for reinstallation or relocation).

f. REMARKS: Detail including split disposition

4.10.6 Plan, Elevation and Section Views:

a. Removal views must appear in the drawing prior to installation views.

b. Plan views show a horizontal plan as viewed looking down, unless labeled

“LKG UP” with viewed direction reversed.

c. Elevation views show a vertical plane that is parallel to ship centerline and must be labeled “LKG PORT” or “LKG STBD”.

d. Section views show a vertical plane that is perpendicular to the ship centerline and must be labeled “LKG FWD” or “LKG AFT”.

e. All views must be labeled with the space name and designator and be cross-referenced to other applicable views.

f. The ship’s frame numbers and reference lines including centerline and baseline must be shown as well as adjacent space names, numbers and accesses (in all directions).

g. Views with dimensions that require precise adherence must be marked with the tolerance or marked “No Deviations”.

h. Isometric and three dimensional (3-D) views are not required but may be used as supplements when they aid in clarity except on electrical drawings where they are prohibited.

i. Each item from the material lists (Sections 4.10.4 and 4.10.5) must be labeled with its Item number Installed items are identified by their item number in a circle with a tag line to the part.

Removed items are identified by “R-“ and their item number in a hexagon with a tag line to the part.

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j. The symbol “REF” must be used adjacent to an item number to indicate the item has been installed in another view, and the item is shown again for reference only. In this case, it does not count toward the quantity shown in the List of Materials.

4.10.7 Details: Details must be mapped back to the plan, elevation or section that they are called out in.

4.10.8 Weight Control Data Table:

a. The Weight Control Data Table must be utilized to track summary level weight and moment changes resulting from changes depicted in the drawing. There must be a row for additions and a row for permanent removals, each with an SWBS number that matches the drawing SWBS.

b. Changes to operating fluids must be included using their unique SWBS number (X98).

c. Changes to ship loads must be included (example; if a drawing is developed to install a foundation to secure removable Sponsor equipment on the deck, the weight of the new equipment must be included as a load).

d. When there is no weight removed by an alteration, “NC” for No Change must be entered in the removal line.

e. A sample Weight Control Data Table is shown below. This block must be tailored for consistency with each ship’s ABS approved lightship values as shown in their Trim & Stability booklet and summarized for each class in the below table ‘MSC Fleet Lightship Units and Reference Points’.

Specifically, weight and distance units, reference point for measurement of LCG (either aft of the forward perpendicular (AFP) or forward of the aft perpendicular (FAP)), and TCG (either port or starboard of the centerline) must match. Additional guidance regarding weight control is available in reference (i).

SWBS WEIGHT

(LB)

VCG

(FT ABL)

LCG

(FT AFP)

TCG

(FT STBD+)

I, R, XI or

XR

WEIGHT CONTROL DATA

I=INSTALL, R = REMOVAL, XI = LOAD ITEM INSTALLED, XR = LOAD ITEM REMOVED

Sample Weight Control Data Block

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Class Units LCG Measurement TCG (+) AS US Aft of FP (FR 0) PORT ESB Metric Fwd of AP (AP @ FR 0) STBD LCC US Aft of FP (FR 0) STBD SBX US MS (FR 32, Aft is positive) STBD T-AG 5001 US Aft of FP (FR 0) T-AGM 24 US Aft of FP (FR 0) PORT T-AGM 25 Metric Aft of FP (FP @ 1443 mm AFT FR 0) PORT T-AGOS 19 US Aft of FP (FR 0) STBD T-AGOS 23 US Aft of FP (FR 0) STBD T-AGS 45 US Aft of FP (FR 0) PORT T-AGS 60-65 US Aft of FP (FR 0) STBD T-AGS 66 US Aft of FP (FR 0) STBD T-AGSE US Aft of FP (FR 0) STBD T-AH US Aft of FP (FR 0) PORT T-AK 3005-3007 US Aft of FP (FP @ FR7/ 21 ft aft of FR 0) PORT T-AK 3008-12 US Aft of FP (FR 0) PORT T-AK 3015 Metric Fwd of AP (AP @ FR2/1.5M fwd FR 0) STBD T-AK 3016 Metric Aft of FP (FR 0) STBD T-AK 3017 US Aft of FP (FR 0) PORT T-AKE Metric Aft of FP (FR 0) PORT T-AKR 295 & 297 US Aft of FP (FR 0) PORT T-AKR 296 & 298 US Aft of FP (FR 0) STBD T-AKR 300-306 US Aft of FP (FR 0) PORT T-AKR 310-317 US Aft of FP (FR 0) PORT T-AO 187 US Aft of FP (FR 0) PORT T-AO 205 Metric Aft of FP (FR 0) STBD T-AOE US Aft of FP (FR 0) STBD T-ARC US Aft of FP (FR 0) PORT T-ARS US Aft of FP (FR 0) PORT T-ATF US Aft of FP (FP @ FR5/10 ft aft of FP) PORT T-ATS Metric Aft of FP (FR 0) PORT T-EPF Metric Fwd of AP (AP @ FR 79) STBD T-ESD Metric Fwd of AP (AP @ FR 0) STBD T-HST Metric Fwd of AP (AP @ FR 85) STBD

MSC Fleet Lightship Units and Reference Points

Fleet Lightship Units & Reference Points

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4.10.9 Nameplate Table & Detail:

NAMEPLATE TABLE

NO. QTY LOCATION EQUIPMENT FIRST LINE SECOND LINE DETAIL REMARKS

a. No.: Sequential numbers must be used. Do not skip item numbers on Rev

(-) drawings.

b. Location: Vessel location where nameplate is to be installed.

c. Detail: Drawing location with additional information.

4.11 CGD Discipline Specific Required Drawing Elements.

4.11.1 System Design Data Table:

SYSTEM DESIGN DATA TABLE

SYSTEM SERVICE

OPERATING

TEMP

DESIGN

TEMP

OPERATING

PRESSURE

DESIGN

PRESSURE ABS

CLASS

TEST

PRESSURE

oF oC oF oC PSI BAR PSI BAR PSI BAR

a. System: System designator

b. Service: Shipboard system

c. ABS Class: Per Marine Vessel Rules, Part 4, Chapter 6, Section 1 (I, II or

III)

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4.11.2 Pump Data Table:

PUMP DATA TABLE

ITEM

NO. MFR PART

NO. SERVICE TYPE

RATED

CAPACITY

(UNITS)

RATED TDH

(UNITS)

SHUT-OFF

HEAD (UNITS)

MOTOR

REMARKS HP RPM

a. Item No.: Designation from List of Materials or other reference number as applicable.

b. Service: Shipboard system.

c. Type: Reflect pump type (e.g., centrifugal, piston, gear, etc.).

d. Identify suitable model by manufacturer and part number to define interface details.

e. Remarks: Must include key design parameters (e.g., impeller diameter for a centrifugal pump that supports multiple impeller sizes).

4.11.3 Pump Curves: Provide the manufacturer’s performance curve(s) for the selected pump(s).

4.11.4 Fan Data Table:

b. System No.: Identifier to related system, exact fan location (i.e., Deck-

Frame-P/S).

c. Fan Location: Compartment location (i.e., Deck-Frame-P/S).

RATING REQ'D BHP

FAN DATA TABLE

ITEM

NO.

SYSTEM

NO.

FAN

LOCATION

DESIGN

CFM

PRESS

IN WG

HP VOLTS RPM CONTROLLER

LOCATION

MASTER SWITCH

LOCATION

SPECIAL

FEATURES

SPACES

SERVED

MFR PART

NO.

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4.11.5 Heater Data Table:

b. System No.: Identifier to related system, typically Fan System No.

c. Heater No.: Unique identifier with reference to shipboard location (i.e., Deck-Frame-P/S).

d. Use of Heater: Preheater or Reheater (delete columns for non-applicable service).

e. Type: Electric or Steam.

f. Size: Heating capacity or other defined sizing with reference.

4.11.6 Cooling Coil Data Table:

COOLING COIL DATA TABLE

NO. MFR PART

NO.

SYSTEM

NO.

COIL

NO. SIZE

REQ'D CLG

(SENSIBLE)

BTU/HR)

TEMP (F)

RH%

SLOPE LOAD

(TONS) AIR (F) CFM

GPM

ROOM CHW ROOM COIL ROOM COIL EDB EWB COIL BYPASS RPNSM

b. System No.: Identifier to related system, typically Fan System No.

c. Coil No.: Unique identifier with reference to shipboard location (i.e., Deck-Frame-P/S).

d. Size: Cooling capacity or other defined sizing with reference.

LB/H VALV REQ ACT

PART

NO.

ΔP IN

WATER

SPACES

SERVED

HEATER DATA TABLE

CFM

STEAM POWER

(KW) VOLTS

TEMP

RANGE

(F)

ITEM

NO.

SYSTEM

NO.

HEATER

NO.

USE OF

HEATER TYPE SIZEMFR .

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4.11.7 Fan Coil Unit Data Table:

FAN COIL UNIT DATA TABLE

NO. MFR PART

NO.

SYSTEM

NO.

FCU

LOCATION SIZE CLG COIL

CAPACITY

HEATING

COIL

CONT

LOCATION

REMOTE

MSV

LOCATION

FAN

HP

TEMP (F)

RH%

SLOPE LOAD (TONS) AIR (F) CFM

GPM SPACES

SERVED ROOM CHV ROOM COIL ROOM COIL EDB EWB COIL BYPASS RPNSM

b. FCU No.: Unique identifier with reference to shipboard location (i.e., Deck-Frame-P/S).

c. Size: Mfr’s defined sizing with reference.

4.11.8 Filter Data Table:

FILTER DATA TABLE

FILTER

ITEM #

AIRFLOW (UNITS)

TYPE SIZE

(UNITS)

DESIGN

PRESS

LOSS

(UNITS)

SUMMER WINTER

4.11.9 Voltage Drop Table: The voltage drop table must be prepared following reference (j) to calculate the voltage drop along power and lighting cables.

VOLTAGE DROP TABLE

CIRCUIT

FEED

CABLE CURRENT

(I)

DROP

FACTOR

(DF)

VOLTAGE

DROP

NO. TYPE LENGTH %VD VD

a. Circuit Feed: Enter the circuit number from the panel. Example; “P408-

02” where P408 is the panel number and 02 is the circuit number.

b. Cable Data: Number, type and length.

c. Current.

d. Drop Factor.

e. Voltage Drop: The voltage drop in the conductors while carrying the maximum current under normal steady condition.

VD: Total %VD: Percentage of nominal voltage (Total circuit VD must not exceed 5%)

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4.11.10 Electric Plant Distribution Impact Data: This block must include all electrical load changes depicted in the drawing.

ELECTRIC PLANT DISTRIBUTION IMPACT DATA

SWBD/

LOAD

CENTER

CIRCUIT

NUMBER

CABLE SWBD/LC

CKT BRKR LOAD

DESCRIPTION

CHANGE IN

TOTAL

CONNECTED

LOAD (A)

INCREASE/

DECREASE PHASE VOLT

TYPE LENGTH TYPE TRIP

EL

a. Switchboard (SWBD)/Load Center: The switchboard or load center that the subject electrical load emanates from and impacts.

b. Circuit (CKT) Number: The switchboard or load center circuit number that the subject electrical load is designated formatted per the following example; “CKT No. (01-104-2)-4P-X” where:

“01” is the deck level “104” is the frame “2” is port “4P” is 440V Power (or “4L” for Lighting) “X” is the circuit.

c. Cable.

Type: Type of cable being installed to support the subject electrical load.

Length: Length of cable being installed to support the subject electrical load.

d. SWBD/Load Center (LC) CKT BRKR.

Type: Manufacturer or style/type of circuit breaker being added by subject electrical load.

Trip Element: Size in amps of circuit breaker trip element or continuous current setting.

e. Load Description: Description of subject electrical load converted to

450V or primary distribution voltage and 3-phase.

f. Change in Total Connected Load: Variance in amperage directly related to subject electrical load converted to primary distribution voltage and 3-phase.

g. Increase or Decrease: Indicate if the variance in amperage from Change in Total Conn Load is an increase or decrease in electrical loading.

h. Phase: All loads must be converted to 3-phase electrical load.

i. Voltage: Indicate 450V or applicable primary distribution voltage of electric plant.

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4.11.12 Cable Tag Designation Table & Detail:

CABLE TAG DESIGNATION TABLE

CABLES

ITEM

NO. QTY ATTACH

METHOD CABLE ASSEMBLY SEE

DETAIL REMARKS

4.12 SRD Required Drawing Elements.

4.12.1 SRD Acceptance Block:

a. This block is used to identify the engineers that reviewed and accepted contractor prepared SRDs, or prepared, reviewed and accepted SRDs developed within N7.

b. If an SRD requires Tech Authority approval (ex: Docking Plan), the “ACCEPTED BY” text in the bottom row of the block is replaced with

“APPROVED BY”.

MSC ACCEPTANCE MSC ACCEPTANCE

REVIEWED BY:

MM/DD/YY

PREPARED BY:

MM/DD/YY F. LAST F. LAST

N7 CODE/TITLE N7 CODE/TITLE

ACCEPTED BY:

MM/DD/YY

REVIEWED BY:

MM/DD/YY F. LAST F. LAST

N7 CODE/TITLE N7 CODE/TITLE

ACCEPTED BY: F. LAST ACCEPTED BY: F. LAST

N7 CODE/TITLE N7 CODE/TITLE

SRD Developed by Contractors SRD Developed by N7

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4.12.2 TALT Completion Block: The following block must be placed under the Revision Block on all SRD revisions to indicate which T-ALTs are included.

T-ALTS INCORPORATED

REV NUMBER/TITLE

A

CLASS- 19-0XX, TITLE

CLASS- 19-0XX. TITLE

CLASS- 20-0XX, TITLE

4.12.3 Revision Status of Sheets Block: When required by the task statement, this block is updated each time an SRD is revised to note the current revision status of each sheet.

Only the first sheet and the sheets that contain revisions have their status changed. When this block is used, the revision identified in the Continuation Title Block (Section 3.9.1) must match the revision noted in this block.

5 4 3 2 1 SH REVISION

STATUS OF

SHEETS A B - - B REV

4.13 Drawing Development Process.

4.13.1 Development of CGD and SRD Drawings:

a. Templates listed in Section 3.6 must be used.

b. During the development phase, version control is maintained by use of

“Preliminary” markings. Preliminary drawings must use sequential alpha numeric revision indicators to denote that they are preliminary. The first preliminary new drawing submitted for review must be revision “P1” (to indicate first review). All changes made to preliminary drawings must be documented in the drawing’s revision block. Each subsequent submittal must be marked with a unique preliminary revision indicator as specified in the task statement (ex. P1A, P1B or P2, P3). When the N7 Project Lead accepts the drawing, it is marked “Rev –” (or the most up to date revision) and all preliminary revisions marks and notes must be removed.

c. The “Rev. –” drawing is the first issue that has been reviewed and accepted by the N7 Project Lead and is ready for submittal to the regulatory body (when applicable) for approval.

4.13.2 Development of ABDs: During an availability, the Port Engineer provides a set of new drawing numbers to the industrial activity for their use in preparing ABDs. The template for an ABD is normally the associated CGD. It incorporates Change Orders and must be further tailored as follows:

a. Title block:

New drawing number assigned as Rev –

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“AS-BUILT” added to the first line of the title (ex: T-ALT 20-XXX

AS-BUILT).

Drawing type changed to ABD

b. Revision block: CGD revisions notes are removed, and revisions made to create the ABD from the CGD baseline are listed.

c. Reference block: Parent CGD and Change Orders are added

d. Weight Control Data Table: Updated or marked with “No Change”.

e. Discipline Specific Design Calculation Tables: Updated or marked with

“No Change”.

f. Contractor Approval Block: Design contractor block replaced with

Industrial Activity approval block.

g. List of New Material updated as needed to identify “or equal” material and equipment installed.

4.13.3 Development of SRD-Ms: The template for an SRD-M is the SRD that requires revision. When an SRD is available in AutoCAD, markups must be clearly indicated, with differing colors and line weights from the original. When only available in .pdf, markups must be made in Adobe. SRD-Ms submitted to the VTL must include:

a. Name, company (or MSC code) of the person that provided the markup and date.

b. Revision notes including List of T-ALTs incorporated or corrections made.

c. Markup drawing file names must use the seven-digit drawing number, revision and “SRD-M” (example; 8499220_A_SRD-M.pdf).

4.14 Drawing Revision Process.

4.14.1 Configuration control is strict and drawing changes can only be made through the formal revision process.

4.14.2 After first approved issue of a drawing, subsequent drawing revisions follow the A, B, C, etc. lettering system. However, letters I, O, P, Q, S, X and Z must not be used.

4.14.3 Revision Development Control: The version control process of new revisions to approved drawings is the same as the process for development of first issue drawings.

4.14.4 Marking of Revisions: The revision letter and change number must be indicated in the body of the drawing adjacent to each change location using a triangle with the revision letter inside and the change number noted as a superscript outside the triangle. An example of a revision triangle is shown below.

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a. Changes must be made by adding, deleting or redrawing.

b. An existing sheet must not be “deleted”, only superseded or replaced.

4.14.5 SRDs are revised for multiple reasons including, incorporation of changes made by TRANSALTS to reflecting current configuration, conversion from class drawings to ship specific drawings, and correction of drawing numbers or content. The contractor approval block must be updated at each revision. In addition to the Revision Block requirements contained in Section 4.9.7, a descriptive Revision Note providing high level information about the revision must be included. Samples are listed below; text within [ ] must be customized to the specific task.

4.14.5.1 For Conversion of SRD Applicability from Class to Ship Specific when configuration changes are identified through ship checks (ex. T-AK Class):

THIS SHIP-SPECIFIC SRD WAS CREATED BY [COMPANY OR RESERVE UNIT] FROM [BUILDER’S]

CLASS-WIDE SRD, [BUILDER] DRAWING NUMBER [XXX-XXX-XXXX, REVISION X]. THE DRAWING

WAS MADE SHIP SPECIFIC TO [T-XX] BY REMOVING ALL REVISION NOTATIONS, REGULATORY

BODY APPROVALS AND PREVIOUSLY ASSIGNED DRAWING NUMBERS AND ASSIGNING A NEW

DRAWING NUMBER. A SHIP CHECK WAS PERFORMED [MM/YYYY] AND ACTUAL CONFIGURATION

WAS CAPTURED IN THIS DRAWING."

4.14.5.2 For Conversion of SRD Applicability from Class to Ship Specific when configuration changes are identified through builder and T-ALT documentation (ex. T- AKE Class):

THIS SHIP-SPECIFIC SRD WAS CREATED BY [COMPANY OR RESERVE UNIT] FROM [BUILDER’S]

CLASS-WIDE SRD, NAVSEA DRAWING NUMBER [XXXXXXX] ([BUILDER] DRAWING NUMBER [XXX-

XXX-XXXX, REVISION X]. A SHIPCHECK WAS NOT PERFORMED. THE DRAWING WAS MADE SHIP

SPECIFIC TO [T-XXX] BY [CUSTOMIZATION EXAMPLE; REMOVING ALL REVISIONS, REVISION

NOTATIONS, PMSXXX OR REGULATORY BODY APPROVALS AND PREVIOUSLY ASSIGNED

DRAWING NUMBERS, AND ASSIGNING A NEW DRAWING NUMBER. ADDITIONALLY, NOTE 1 OF

THE ORIGINAL CLASS-WIDE SRD THAT REFERRED TO THE BOOKLET OF SYSTEM DIAGRAMS

NAVSEA DRAWING NUMBER … WAS ELIMINATED. ALL REFERENCES, LIST OF EQUIPMENT, NOTES

AND STANDARD SYMBOLS, CONTAINED IN THE BOOKLET AND APPLICABLE TO THIS SYSTEM

DIAGRAM, HAVE BEEN INCORPORATED INTO THIS SRD]."

4.14.5.3 For Conversion of SRDs to Correct Drawing Number (ex. T-EPF

Class):

THIS SRD WAS CREATED FROM [BUILDER’S] SHIP SPECIFIC SRD, NAVSEA DRAWING NUMBER

[XXXXXXX] ([BUILDER] DRAWING NUMBER [XXX-XXX-XXXX, REVISION X]). A NEW DRAWING

NUMBER WAS ASSIGNED TO CORRECT DUPLICATE USE OF THE ORIGINALLY ASSIGNED NAVSEA

DRAWING NUMBER. ADDITIONAL CHANGES MADE INCLUDE [CUSTOMIZATION EXAMPLE;

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REMOVING ALL REVISION NOTATIONS, REGULATORY BODY APPROVALS, CORRECTING

REFERENCED DRAWING NUMBERS AND REFORMATTING PER MSC’S SRD STANDARD FORMAT.]

4.14.6 Superseding and Revising Drawing Applicability: Drawings must be revised rather than superseded when possible, since a change to the drawing number disrupts the association to other drawings and documents where its referenced. However, new number assignments are sometimes necessary. Examples include converting from a class SRD to a set of ship specific SRDs and when correcting duplicate use of a drawing number assigned by the builder. In these cases, below guidance applies:

4.14.6.1 If the original SRD is ship specific: The original drawing must be superseded by the new drawing number and the original drawing must be watermark stamped “SUPERSEDED BY XXX-XXXXXXX” on the first sheet (at minimum) and upreved. The final revision note must state: THIS DRAWING HAS BEEN SUPERSEDED BY DRAWING

NUMBER XXXXXXX.

4.14.6.2 If the original SRD is applicable to a class or more than one ship but a ship specific drawing has not been created for all ships: The original drawing must be revised to remove the subject vessel applicability (strike through) and upreved with a revision note indicating the new ship specific SRD drawing number.

4.14.6.3 If the original SRD was applicable to the class or more than one ship and the revision results in the last ship being removed from the applicability list: The drawing becomes fully superseded and must be upreved a final time and watermark stamped “SUPERSEDED”. The final rev note must state “THIS DRAWING HAS BEEN SUPERSEDED” followed by the superseding ship specific SRD numbers for each ship that was originally applicable.

5 RECORDS & REPORTS:

5.1 MSC Drawings are stored in the Virtual Tech Library, https://msceng.dc3n.navy.mil/samm/

6 DEFINITIONS:

6.1 Industrial Activity Furnished (IAF): The term IAF has been superseded by CFE/ CFM and has the same meaning as CFE/CFM.

6.2 Initial Issue Drawing: The initial issue of a drawing is that accepted by the N7 Project Lead at which time configuration control begins. At this time, changes for any reason requires a subsequent revision.

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6.3 Project Lead: For drawings developed in-house, the Project Lead is the N7 engineer assigned in SAMM Task Manager. For drawings developed by contractors, the Project Lead is the task statement’s N7 Technical Point of Contact (TPOC).

6.4 Salient Characteristics: The characteristics that specifically describe the essential physical, functional and performance features of the component, material, or equipment required. They are the “form, fit and function” features that are identified in the specifications as a mandatory requirement that a proposed "equal" substitution must possess.

6.5 Task Statement: The Task Statement is the Performance Work Statement (PWS) for drawings developed by contractors, and the SAMM Task Manager tasking for drawings developed by N7.

6.6 Virtual Technical Library: The Virtual Technical Library (VTL) is the single point technical library for Military Sealift Command. The VTL stores the master copies of all Drawings and Technical Manuals for MSC vessels and manages MSC Drawing Numbers.

The VTL web site is located at: https://msceng.dc3n.navy.mil/samm/ and their e-mail address is MSC_N7_TechLibrary@us.navy.mil..

6.7 Working Drawing (WD): Working Drawings are prepared by an industrial activity (typically a shipyard) in order to assist them in the detail design development and accomplishment of the work required by the MSC work package. WDs are prepared in the industrial activity’s format, and are not assigned MSC drawing numbers, reviewed, approved or retained by MSC.

7 PROCESS MANAGEMENT:

7.1 Office of Primary Responsibility (OPR): N72

7.2 Interfaces: N71, N73, N74, N75, Ship Sponsors, Design Contractors, OPCOs

7.3 Key Performance Indicators: Conformance of newly developed drawings and revision of existing drawings to the requirements herein.

8 REVISIONS: Original.

mailto:MSC_N7_TechLibrary@us.navy.mil