ASTM F1808-03(2019)
(Guide)Standard Guide for Weight Control Technical Requirements for Surface Ships
Standard Guide for Weight Control Technical Requirements for Surface Ships
SIGNIFICANCE AND USE
5.1 It is important to know the amount of weight and its location before the ship is built to be sure that when it is built it will have positive stability. Only through detailed weight estimating in the design stage and during construction can one be ensured that positive stability will be achieved and retained.
SCOPE
1.1 This guide provides recommended weight control technical requirements for surface ships and discusses different types of weight estimates, reports, and weight control procedures. It contains a weight classification that will assist in achieving uniformity by standardizing the weight-reporting system.
1.2 This guide 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 the text, or in example formats included in this guide, it is to be understood that corresponding SI units may be substituted if applicable to a ship designed and constructed in SI units, provided that whichever system is used, it is consistently used in all weight control reporting documentation for the ship.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1808 − 03 (Reapproved 2019) An American National Standard
Standard Guide for
Weight Control Technical Requirements for Surface Ships
This standard is issued under the fixed designation F1808; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 3. Terminology
1.1 This guide provides recommended weight control tech- 3.1 Definitions:
nical requirements for surface ships and discusses different
3.1.1 agreed weight and center of gravity estimate, n—an
types of weight estimates, reports, and weight control proce-
estimate of light ship weight and centers of gravity data,
dures. It contains a weight classification that will assist in
mutually agreed upon between the owner and the shipbuilder
achieving uniformity by standardizing the weight-reporting
shortly after award of the shipbuilding contract, based on the
system.
shipdesigninformation,forexample,specifications,drawings,
and so forth, available at the time of award.
1.2 This guide is applicable to ships designed and con-
structed in inch-pound units of measurement and to ships
3.1.2 as-built weight and center of gravity estimate, n—a
designed and constructed in SI units of measurement. When-
detailed final estimate of light ship weight and centers of
everinch-poundunitsareshownorreferredtointhetext,orin
gravity data, adjusted for inclining experiment results, reflect-
example formats included in this guide, it is to be understood
ing the as-built ship including the net effect of contract
that corresponding SI units may be substituted if applicable to
modifications.
a ship designed and constructed in SI units, provided that
3.1.3 center of gravity, n—the point through which the
whichever system is used, it is consistently used in all weight
resultant of all gravitational forces on a ship or a component
control reporting documentation for the ship.
passes.Thelocation,abalancepoint,atwhichtheentireweight
1.3 This international standard was developed in accor-
of a ship may be considered to be concentrated.
dance with internationally recognized principles on standard-
3.1.4 deadweight, n—the total carrying capacity of a ship
ization established in the Decision on Principles for the
including weight of cargo, fuel, lubricating oil, fresh water in
Development of International Standards, Guides and Recom-
tanks, stores, passengers and baggage, and crew and their
mendations issued by the World Trade Organization Technical
effects.
Barriers to Trade (TBT) Committee.
3.1.5 inclining experiment, n—a procedure performed on a
2. Referenced Documents
completed, or almost completed, ship to establish experimen-
2.1 ASTM Standards:
tally the light ship values of the displacement and the vertical,
F1321Guide for Conducting a Stability Test (Lightweight
longitudinal, and transverse positions of its center of gravity
Survey and Inclining Experiment) to Determine the Light
(see Guide F1321 for detailed procedures).
Ship Displacement and Centers of Gravity of a Vessel
3.1.6 independent weight and center of gravity estimate,
F1332Practice for Use of SI (Metric) Units in Maritime
n—the estimate of light ship weight and centers of gravity
Applications (Committee F25 Supplement to IEEE/
3 performed by the shipbuilder shortly after award of the
ASTM SI 10) (Withdrawn 2017)
shipbuilding contract based on the ship design information
available at the time of award. When compared with the
This guide is under the jurisdiction of ASTM CommitteeF25 on Ships and
owner’s estimate and upon resolution of differences, an agreed
Marine Technology and is the direct responsibility of SubcommitteeF25.01 on
upon weight and center of gravity estimate will result.
Structures.
Current edition approved Dec. 1, 2019. Published January 2020. Originally
3.1.7 light ship weight, n—theweightoftheshipwithallits
approved in 1997. Last previous edition approved in 2013 as F1808–03 (2013).
equipment and outfit, including permanent (fixed) solid or
DOI: 10.1520/F1808-03R19.
liquid ballast, spare parts that are carried on board, water in
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
boilers at operating levels, machinery including Marine Sani-
Standards volume information, refer to the standard’s Document Summary page on
tation Device units in working condition, lubricating oil in all
the ASTM website.
machinery, but not in storage tanks, and liquids in all piping
The last approved version of this historical standard is referenced on
www.astm.org. systems.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1808 − 03 (2019)
3.1.8 longitudinal center of gravity (LCG), n—the point Sections S1–S4 describe the specific weight control technical
throughwhichthegravitationalforcesonashippass,measured requirements for U.S. Navy surface ships.
longitudinally from amidships, measured from the forward
5. Significance and Use
perpendicular,orinsomecases,measuredfromtheaftperpen-
dicular.
5.1 It is important to know the amount of weight and its
location before the ship is built to be sure that when it is built
3.1.9 transverse center of gravity (TCG), n—the point
it will have positive stability. Only through detailed weight
throughwhichthegravitationalforcesonashippass,measured
estimating in the design stage and during construction can one
transversely, port or starboard, from the ship’s centerline.
beensuredthatpositivestabilitywillbeachievedandretained.
3.1.10 vertical center of gravity (KG or VCG), n—the point
throughwhichthegravitationalforcesonashippassmeasured
6. Procedure
vertically from the keel (K) or the ship’s baseline.
6.1 Aspecified number of calendar days, that is, 30, 45, 60,
3.1.11 weigh; to weigh, v—as commonly understood in
or 90 after date of award, as specified by the owner, the
everyday usage and in the maritime industry, and as used
shipbuilder should submit for agreement an independent
throughout this guide, means to determine by measuring the
weight and center of gravity estimate. This estimate should
mass of.
describe the weight and centers of gravity of the ship in
comprehensive detail and should include summaries and work
3.1.12 weight, n—as commonly understood in everyday
sheets showing the detailed work performed, for example,
usageandinthemaritimeindustry,andasusedthroughoutthis
calculations and estimates based on the design information,
guide, is synonymous with mass. In this guide, weight in
drawings, specification, and so forth. Appendix X1 contains
inch-pound units is measured in pounds and in long tons of
suggestedformsfortheindependentestimate,anditincludesa
2240 lbs; and in SI units (metric), weight is measured in
suggested weight classification system for the estimate. Terms
kilograms and in metric tons of 100 kg. Refer to Practice
used in the weight classification are defined in the Maritime
F1332 for conversion factors to convert inch-pound quantities
Administration Publication, Classification of Merchant Ship
toSI(metric)quantitiesforunitsofweight,moment,moments
Weights.
to trim, and so forth.
6.2 A mutual agreement between the shipbuilder and the
3.1.13 weightclassification,n—thesystemusedinlightship
owneronthelightshipweightandcentersofgravityshouldbe
weight estimating for grouping materials, equipment, or com-
reached as quickly as possible after award of the shipbuilding
ponents of the ship in a structured order to facilitate compari-
contract. Agreement action should consist of a review of
son and to ensure completeness.
shipbuilder’s independent weight and center of gravity esti-
3.1.14 weight group, n—one of the three major elements of
mates and comparison with the owner’s estimate. Upon reso-
light ship weight as used in the weight classification, that is,
lution of differences, an agreed upon weight and center of
hull structure, outfit, and machinery.
gravity estimate will result. Thereafter, the shipbuilder should
beresponsibleforobtaininginthecompletedvesseltheagreed
4. Summary of Guide
upon weight and center of gravity characteristics adjusted for
4.1 Determination of Weight and Moment Data—The authorized departures from the contracted ship design, re-
weight and moment data for all components and material and flected in the agreed upon estimate.
their overall effect on the ship’s weight, center of gravity, list,
6.3 Departures from the contracted ship design, reflected in
and trim should be determined. As ship design or ship
the agreed upon estimate, which affect the light ship weight
construction drawings are prepared and as material is selected,
and centers of gravity, should not be undertaken until the
acquired, or received, the weight and centers of gravity of all
shipbuilder has submitted to the owner his estimate of the
itemsthatcomprisetheshipshouldbedeterminedandreported
effectonweightandcentersofgravityoftheshipandobtained
in the weight estimates and reports. These data may be
written approval to proceed with the department. Departures,
obtained by estimation or calculation during preliminary and
which have a total impact on any weight group of less than a
contract design, by a combination of estimation or calculation
specified percentage, that is, 0.01, 0.02, 0.03, or 0.04% of the
of ship construction drawings, and by actual weight determi-
light ship weight, may be considered negligible and will not
nation of items during detail design and construction.
require written approval with respect to weight.
4.2 Weight Reporting and Control—The procedures for
6.4 The shipbuilder should submit periodically, as agreed
weight reporting and control, regardless of the level of
upon, to the owner, a tabulation of approved departures and
reporting, are described in Section 6 and apply for commercial
their cumulative effect on weight and centers of gravity of the
ships.The method and frequency of weight reporting can vary
agreed light ship estimate. In addition, when submitting plans
depending on the specific ship design, as well as the technical
that involve departures from the type of construction in the
requirements set forth in the contract. The extent and level of
contractedshipdesign,reflectedintheestimate,theshipbuilder
weight control also can vary depending on the specific ship
design.Althoughtheweightcontroltechnicalrequirementsfor
U.S. Department of Transportation, Maritime Administration Classification of
commercial ships usually are less demanding than those for
Merchant Ship Weights, January 1985. Available from the U.S. Maritime
U.S. Navy surface ships, the need for a mechanism to control
Administration, Office of Ship Construction, MAR 720, 400 Seventh St., SW,
the weight of a ship still exists. Supplementary Requirement Washington, DC 20590.
F1808 − 03 (2019)
should itemize such departures and their effect on light ship 7. Keywords
weight and centers of gravity in his periodic reports. A final
7.1 light ship; ship acquisition; weight control; weight
report should be submitted at the time of delivery adjusted to
estimate; weight report
bringtheestimatedlightshipweightandcentersofgravityinto
reasonable agreement with the inclining experiment results.
SUPPLEMENTARY REQUIREMENTS
The following supplementary requirements shall apply only when specified by the purchaser in the
contract or purchase order. These requirements normally are invoked for U.S. Navy Surface Ships.
S1. Special Government Requirements between the accepted weight estimate (AWE) or the allocated
baseline weight estimate (ABWE) and the delivered ship as
S1.1 Government Documents, Drawings, and
inclined.
Publications—The following government documents,
S2.2 accepted weight estimate (AWE), n—theAWE defines
drawings, and publications form a part of this guide to the
the weight and centers of gravity of a ship that was awarded
extent specified herein. Unless otherwise specified, the issues
are those cited in the solicitation. under a specification-type contract using the information that
S1.1.1 Naval Sea Systems Command (NAVSEA) Docu- was available at the time of contract award. It establishes
contractual values for weight and KG and is the baseline for
ments:
0900-LP-039-9020 Ship Work Breakdown Structure for detail design and construction.
Nuclear Propulsion Plant (U)
S2.3 acquisition margins, n—acquisition margins are
S9040-AA-IDX-010/SWBS 5D, Expanded Ship Work
weight and KG allowances included in the weight estimate to
Breakdown Structure, Vol I
cover the inherent limits of precision and the undefined
S9040-AA-IDX-020/SWBS 5D, Expanded Ship Work
variationsofcomponentweightandcentersofgravitythattake
Breakdown Structure, Vol II
placethroughoutthedesignphasesandduringtheconstruction
S1.2 Nongovernment Publications—The following docu-
of a ship. To provide for adequate weight control and configu-
ment(s) form a part of this guide to the extent specified herein.
ration control, acquisition margins are divided into five ac-
Unlessotherwisespecified,theissuesofthedocuments,which
counts: preliminary design margin, contract design margin,
are DOD adopted, are those listed in the issue of the Depart-
detail design and building margin, contract modification
ment of Defense Index of Specifications and Standards
margin, and government-furnished material (GFM) margin.
(DODISS) cited in the solicitation. Unless otherwise specified,
S2.4 actual weight, n—actual weight is the value obtained
theissuesofdocumentsnotlistedintheDODISSaretheissues
by a measurement of material on an accurate scale or other
of the documents cited in the solicitation (see S4.1).
weighing device.
S1.2.1 ANSI Document:
S2.5 allocated baseline weight estimate (ABWE), n—the
X3.4 Code for Information Interchange
ABWE is the contractor’s definition of the weight and centers
NOTE S1—Nongovernment standards and other publications normally
ofgravityofashipthatwasawardedunderaperformance-type
are available from the organizations that prepare or distribute the
contract at the time of hull and propulsion configuration
documents.Thesedocumentsalsomaybeavailableinorthroughlibraries
or other informational services. approval. It is the baseline for detail design and construction.
S1.3 Order of Precedence—In the event of a conflict S2.6 b
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