Serving the Aerospace - Shipbuilding - Land Vehicle
and Allied Industries
Executive Secretary
P.O. Box 60024, Terminal Annex
Los Angeles, CA 90060 / RECOMMENDED
PRACTICE
NUMBER 12
Date Issued: May 22, 2002
Weight Control Technical Requirements
for Surface Ships
Revision Issue No. C D
Prepared by
Government - Industry Workshop
Society of Allied Weight Engineers
All SAWE technical reports, including standards applied and practices recommended, are advisory only. Their use by anyone engaged in industry or trade is entirely voluntary. There is no agreement to adhere to any SAWE standard or recommended practice, and no commitment to conform to or be guided by any technical report. In formulating and approving technical reports, the SAWE will not investigate or consider patents which may apply to the subject matter. Prospective users of the report are responsible for protecting themselves against liability for infringement of patents. Notwithstanding the above, if this recommended practice is incorporated into a contract, it shall be binding to the extent specified in the contract.
SAWE RECOMMENDED PRACTICE
Change Record
Issue No / Date / Title/Brief Description / Entered ByA
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B
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C / 06/04/96
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05/21/97
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05/22/02 / On page 2, deleted reference to cancelled
DOD-STD-1690 (Government document) "Maritime Metric Practice Guide", and replaced with Non-Government document, on page 2, "Use of SI Units in Maritime Application".
On page 36 and 37, corrected figures 9 and 9A, Trim and List column titles to read TRIM (F)/
(A) and LIST (P)/(S).
______
On page ii, Change Record Issue No. A, corrected description to read "...page 2,..." in instead of "... page 3,..."
On page 1, modified Section 1.1, Scope.
On page 1, added Section 1.3, Units of Measurement.
On page 3, revised Section 3.2, Accepted Weight Estimate, by replacing "...centers..." with "...center...".
On page 5, Section 3.21, Electronic Media replaced previous wording "Magnetic Media" (previous Section 3.35). Replaced all references to "magnetic" with the word "electronic", and re-numbered all sections in Section 3 as appropriate.
On page 6, Section 3.34 (previous Section 3.33), Light Ship Condition (Condition A):
deleted "... aviation mobile support equipment as assigned,..." from definition.
On page 14, revised Section 5.1.2.10, Magnetic
Media, to read "Electronic Media" and replaced all references to "magnetic" with the word "electronic".
On page 23, revised Section 5.3.4.6, Magnetic Media, to read "Electronic Media" and replaced all references to "magnetic" with the word "electronic".
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Page 1, Section 1.1, added A... and service life... @
Page 2, Section 2.2, added AF1321-92 ...@
Page 4, Section 3.9, and page 6, Section 3.26, substituted A... empty weight...@ with A... fully fueled...@.
Page 7, Section 3.27, added definition of FSC
Page 8, Section 3.43, added definition of Planning Yard
Page 12, Section 4.2.8, deleted AThe original ... MIL D 5450".
Page 14, Section 5.1.2.4, deleted AThe format of ... provided by NAVSEA@.
Page 15, Section 5.1.2.9, deleted Aand the concurrence of cognizant NAVSEA tech code.@.
Page 20, Section 5.3.1.5, added AThe detail data ... specified in the Appendix@.
Page 26, Section 5.1.2.10, and Section 5.3.4.7 was moved and relabelled Section 5.6 and 5.5 respectively.
Pages 24 and 25, added Sections: 5.3.5, 5.4, 5.4.1, 5.4.2, 5.4.3, 5.4.3.1, 5.4.3.2, 5.4.3.3, 5.4.4, 5.4.5, 5.4.6, 5.4,7, 5.5, 5.6
Page 27, revised figure 1 to include in-service phase.
Renumbered figures. / D. Cimino
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D. Cimino
______
D. Cimino
C. Filiopoulos
SAWE RECOMMENDED PRACTICE
Issue No / Date / Title/Brief Description / Entered ByD
FORWARD
The technical responsibility for the content and currency of this recommended practice resides with the incumbent chairperson(s) of the Marine Systems Government/Industry Workshop of the Society of Allied Weight Engineers. Any comments or questions regarding this recommended practice should be addressed to the SAWE Executive Secretary, whose address is shown with the Title Page logo with attention to the Marine Systems Government/Industry Workshop.
SAWE RECOMMENDED PRACTICE
1
TABLE OF CONTENTS
1. SCOPE......
1.1 Scope
1.2 Reports interface......
1.3 Units of Measurement
2. APPLICABLE DOCUMENTS......
2.1 Government documents
2.1.1 Specifications, standards, and handbooks
2.1.2 Other Government documents, drawings, and publications
2.2 Non-Government publications
2.3 Order of precedence
3. DEFINITIONS
3.1 Accepted Ship Report (ASR)
3.2 Accepted Weight Estimate (AWE)
3.3 Acquisition margins
3.4 Actual weight
3.5 Allocated Baseline Weight Estimate (ABWE)
3.6 Baseline Weight Estimate (BWE)
3.7 Bidder's Independent Weight Estimate (BIWE)
3.8 Calculated weight
3.9 Capacity Load Condition (Condition E)
3.10 Category
3.11 Category system
3.12 Contract Data Requirements List (CDRL) (DD Form 1423)
3.13 Contract design margin
3.14 Contract Design Weight Estimate (CDWE)
3.15 Contract modification margin
3.16 Contract modification summary
3.17 Contractorresponsible condition
3.18 Current weight
3.19 Design and Weight Data Sheet
3.20 Detail design and building margin
3.21 Electronic media
3.22 Estimated weight
3.23 Expanded Ship Work Breakdown Structure (ESWBS)
3.24 Feasibility Study Weight Estimate
3.25 Final Weight Report (FWR)
3.26 Full Load Condition (Condition D)
3.27 Full Service Contractor(FSC)
3.28 GovernmentFurnished Material (GFM) margin
3.29 GovernmentFurnished Material summary
3.30 Group
3.31 Gyradius
3.32 Inchpound units
3.33 Inclining experiment
3.34 KG
3.35 Light Ship Condition (Condition A)
3.36 Longitudinal lever
3.37 Mass properties data
3.38 Metric units
3.39 Moment
3.40 Percent completion
3.41 Performancetype contract
3.42 Pitch moment of inertia
3.43 Planning Yard
3.44 Preliminary Allocated Baseline Weight Estimate (PABWE)
3.45 Preliminary design margin
3.46 Preliminary Design Weight Estimate
3.47 Quarterly Weight Report (QWR)
3.48 Roll moment of inertia
3.49 Service Life Allowances
3.50 SI units(International System of Units)
3.51 Specificationtype contract
3.52 Standard longitudinal station breakdown
3.53 Threedigit system
3.54 Transverse lever
3.55 Vertical lever
3.56 Weight control
3.57 Weight control plan
3.58 Weight distribution
3.59 Weight moment of inertia
3.60 Weight reporting
3.61 Yaw moment of inertia
4. GENERAL REQUIREMENTS
4.1 Determination of mass properties data
4.2 General report requirements
4.2.1 Loading conditions
4.2.2 Margins
4.2.3 Reasons for changes
4.2.4 Table of contents
4.2.5 Special coding
4.2.6 Lever symbol
4.2.7 Reporting system units
4.2.8 Paper
4.2.9 Supporting documents
4.3 Classified reports
5. DETAILED REQUIREMENTS
5.1 Preliminary/contract design phases
5.1.1 Weight estimates and reports
5.1.1.1 Baseline weight estimates
5.1.1.2 Interim reports
5.1.1.3 Final design weight estimate
5.1.2 Supplemental documents
5.1.2.1 Weight and moment tradeoff studies
5.1.2.2 Weight distribution report
5.1.2.3 Weight moment of inertia
5.1.2.4 Ship specification sections
5.1.2.5 Circular of requirements sections
5.1.2.6 Contract Data Requirements List (CDRL)
5.1.2.7 Solicitation input
5.1.2.8 Weight control contract clause
5.1.2.9 Design notebook
5.1.2.10 Design history
5.2 Preaward process
5.2.1 Weight estimates
5.2.1.1 Bidder's Independent Weight Estimate (BIWE)
5.2.1.2 Preliminary Allocated Baseline Weight Estimate (PABWE)
5.2.2 Supplemental documents
5.2.2.1 Preliminary weight control plan
5.2.2.2 Resumes
5.3.1 Weight estimates and reports
5.3.1.1 Determination of mass properties data
5.3.1.2 Accepted Weight Estimate (AWE).......
5.3.1.3 Allocated Baseline Weight Estimate (ABWE)
5.3.1.4 Quarterly Weight Reports (QWR)
5.3.1.5 Final Weight Report (FWR)
5.3.2 Weight estimate and report appendices
5.3.2.1 GFM summary
5.3.2.1.1 Adjustment to baseline GFM
5.3.2.1.2 Design development to baseline GFM
5.3.2.1.3 Revision to Schedule A.......
5.3.2.1.4 Acquisition responsibility changes from Government to Contractor
5.3.2.1.5 Acquisition responsibility changes from Contractor to Government
5.3.2.1.6 GFM summary format
5.3.2.2 Contract modification summary
5.3.3 Supplemental weight report
5.3.3.1 Machinery weight report (nuclear)
5.3.3.1.1 Machinery weight report format
5.3.4 Supplemental documents
5.3.4.1 Weight control plan
5.3.4.2 Accepted Ship Report (ASR).......
5.3.4.3 Design and Weight Data Sheet
5.3.4.4 Weight moment of inertia report
5.3.4.5 Weight distribution report
5.3.5 Vendor Weight Control
5.4 Service Life Weight Control
5.4.1 Post Shakedown Availability Weight and Moment Report
5.4.2 Determination of Weights During Service Life
5.4.3 Service Life Weight and Moment Reporting
5.4.3.1. Preliminary Service Life Weight and Moment Report
5.4.3.2 Estimated Service Life Weight and Moment Report
5.4.3.3 Actual Service Life Weight and Moment Report
5.4.4 Service Life Stability Study
5.4.5 Ballast Study
5.4.6 Service Life Weight and Moment Compensation Report
5.4.7 Service Life Inclining Experiments
5.5 Weight and moment tradeoff studies......
5.6 Electronic media
6. NOTES......
6.1Intended use
6.2Issue of DODISS
6.3Data requirements
6.4 Subject term (key word) listing......
6.5 Changes from previous issue
APPENDIX......
SAWE RECOMMENDED PRACTICE
1
TABLE OF FIGURES
Figure 1. Interface of Weight Reporting ......
Figure 2. Example of Three-digit Format......
Figure 3. Example of Light Ship Condition Format......
Figure 4. Example of Full Load Condition Format......
Figure 5. Example of Contractor-responsible Condition Format......
Figure 6. Example of Margins Format......
Figure 7. Example of Interim Weight Report Format (page 1)......
Figure 8. Example of Interim Weight Report Format (page 2)......
Figure 9. Example of GFM Summary Report Format......
Figure 10. Example of Accepted Ship Report Format......
Figure 11. Example of Accepted Ship Report format......
Figure 12. Example of Design and Weight Data Sheet Format......
Figure 13. Example of Navy Standard Weight Estimate Format......
Figure 14. Shapes for Io Calculation......
SAWE RECOMMENDED PRACTICE
1
1.0 SCOPE
1.1 Scope. This recommended practice provides weight control technical requirements for all phases of surface ships acquisition (i.e., preliminary design through detail design and construction) and service life and also describes different types of weight estimates, reports, and weight control procedures including a weight classification system which assists in achieving uniformity and standardizing weight reporting. The requirements in this practice apply (either in part or in total) only as specified in a contractual agreement (e.g., contract clause, purchase order, etc.).
1.2 Reports interface. The interface of weight estimates and reports is depicted on Figure 1.
1.3 Units of Measurement. This recommended practice is applicable to ships designed and constructed in inch-pound units of measurement and to ships designed and constructed in SI units of measurement. Whenever inch-pound units are shown or referred to in this recommended practice, or in example formats included in this practice, it is understood that corresponding SI units may be substituted, if applicable, a ship designed and constructed in SI units, provided that whichever system is used, it is consistently used in all weight reporting documentation for the ship.
SAWE RECOMMENDED PRACTICE
1
2.0 APPLICABLE DOCUMENTS
2.1 Government documents.
2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2).
SPECIFICATIONS
MILITARY
MIL-D-5480-Data, Engineering and Technical: Reproduction Requirements for.
2.1.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation.
NAVAL SEA SYSTEMS COMMAND (NAVSEA)
PUBLICATIONS:
0900-LP-039-9020-Ship Work Breakdown Structure for Nuclear Propulsion Plant.
S9040-AA-IDX-010/SWBS 5D-Expanded Ship Work Breakdown Structure, Vol I.
S9040-AA-IDX-020/SWBS 5D-Expanded Ship Work Breakdown Structure, Vol II.
2.2 Non-Government publications. The following document(s) form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2).
AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)
F1332Use of SI Units in Maritime Application (Supplement to ASTM E380)
F1321-92Standard Guide of Conducting a Stability Test (Lightweight Survey and Inclining Experiment) to Determine the Lightship Displacement and Centers of Gravity of a Vessel, 15 December 1992.
AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)
X3.4Code for Information Interchange
2.3 Order of precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
SAWE RECOMMENDED PRACTICE
1
3.0 DEFINITIONS
3.1 Accepted Ship Report (ASR). The ASR is the document that demonstrates the Contractor's performance with regard to weight control. The ASR highlights the differences between the Accepted Weight Estimate (AWE) or the Allocated Baseline Weight Estimate (ABWE) and the delivered ship as inclined (see 5.3.4.2).
3.2 Accepted Weight Estimate (AWE). The AWE defines the weight and center of gravity of a ship that was awarded under a specificationtype contract using the information that was available at the time of contract award (see 5.3.1.2). It establishes contractual values for weight and KG and is the baseline for detail design and construction.
3.3 Acquisition margins. Acquisition margins are weight and KG allowances included in the weight estimate to cover the inherent limits of precision and the undefined variations of component weight and centers of gravity that take place throughout the design phases and during the construction of a ship. In order to provide for adequate weight control and configuration control, acquisition margins are divided into five accounts: preliminary design margin, contract design margin, detail design and building margin, contract modification margin, and Government-Furnished Material (GFM) margin.
3.4 Actual weight. Actual weight is the value obtained by a measurement of material on an accurate scale or other weighing device.
3.5 Allocated Baseline Weight Estimate (ABWE). The ABWE is the Contractor's definition of the weight and centers of gravity of a ship that was awarded under a performance-type contract at the time of hull and propulsion configuration approval (see 5.3.1.3). It is the baseline for detail design and construction.
3.6 Baseline Weight Estimate (BWE). The BWE is any designated weight estimate that is used as a starting point in a design phase for comparative analysis with subsequent weight estimates. Before contract award, the final estimate of each design phase is usually the baseline estimate for the succeeding phase. After contract award, the AWE or ABWE is usually the baseline estimate for the remainder of detail design and construction.
3.7 Bidder's Independent Weight Estimate (BIWE). The bidder's (or offeror's) independent weight estimate is prepared by each potential contractor in response to a solicitation. It is the bidder's evaluation of the ship design based on the ship specifications, drawings, and data that comprise the contract package.
3.8 Calculated weight. Calculated weight is weight computed from ship construction drawings and vendor drawings.
3.9 Capacity Load Condition (Condition E). The capacity load condition is the ship complete and ready for service in every respect. It is light ship (Condition A) plus the following variable loads: maximum number of officers, crew, and passengers that can be accommodated and their effects; maximum stowage of ammunition in magazines and ready service spaces; full allowance of aircraft and vehicles (fully fueled with full allowance of repair parts and stores); maximum amount of provisions and stores that can be carried in the assigned spaces; and maximum capacity of liquids in tanks. Fuel and lube oil shall be not greater than 95 percent of tank capacity, unless such tanks are compensating. Compensating tanks shall be considered filled with 95 percent fuel and 5 percent salt water. Maximum amounts of cargo and supplies, other than for ship's own use, shall be included to the full capacity of the assigned spaces. This load condition shall be not greater than the limiting drafts.
3.10 Category. Category is a fundamental unit of machinery weight classification for nuclear-propelled ships in accordance with NAVSEA 0900LP0399020.
SAWE RECOMMENDED PRACTICE
1
3.113.11 Category system. Category system is a system of machinery weight classification for nuclear-propelled ships in accordance with NAVSEA 0900LP0399020.
3.113.12Characteristics growth- define
3.13 Class accepted weight estimate (CAWE). When Tthe AWE that is developed in a cooperative and integrated effort by two or more class lead contractors. The construction may be totally independent and competitive from the detail design but would still require each builder to maintain the acquisition margin stated in the CAWE.
3.14 Class Quarterly Weight report (CQWR). The QWR hat is developed in a cooperative and integrated effort by two or more class lead contractors.
3.12 Contract Data Requirements List (CDRL) (DD Form 1423). A CDRL is a contract form listing all data items selected from an authorized data list to be delivered under the contract. It includes the format, content, frequency, submittal and distribution requirements.
3.13 Contract design margin. The contract design margin is a weight and KG allowance included in the weight estimate to account for increases associated with design development during the contract design phase. This margin is included in the feasibility and preliminary design phases. No portion of this margin is consumed prior to the start of contract design.
3.14 Contract Design Weight Estimate (CDWE). The CDWE is the weight estimate of the light ship, full load, and any other specified loading condition prepared during the contract design phase.
3.15 Contract modification margin. The contract modification margin is a weight and KG allowance included in the weight estimates and reports to account for increases associated with contract modifications issued during the detail design and construction phase. This margin is included in the feasibility, preliminary, and contract design phases. For performance-type contracts this margin is also included in detail design and building phase. Sometimes this applies to other types of contracts. No portion of this margin is consumed prior to award of the detail design and construction contract.
3.16 Contract modification summary. The contract modification summary is a complete listing of the weight and moment effects of approved contract changes. This information is included as an appendix to the quarterly weight reports, class quarterly weight reports, the accepted ship report, and the final weight report (see 5.3.2.2). In the case where the detail design and construction are separate contracts, this summary is included in the CAWE and AWE.
3.17 Contractorresponsible condition. The Contractor-responsible condition is the full load condition without the effects of contract modifications, changes in GFM, and other allowable changes after the establishment of the CAWE, AWE or ABWE. This condition is used to measure the Contractor's progress in achieving his requirement to deliver the ship within contractual values (see 5.3.1.4).