ASTM F1808-03(2013)
(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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F1808 − 03 (Reapproved 2013) 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 shipdesigninformation,forexample,specifications,drawings,
and so forth, available at the time of award.
1.1 This guide provides recommended weight control tech-
nical requirements for surface ships and discusses different
3.1.2 as-built weight and center of gravity estimate, n—a
types of weight estimates, reports, and weight control proce-
detailed final estimate of light ship weight and centers of
dures. It contains a weight classification that will assist in
gravity data, adjusted for inclining experiment results, reflect-
achieving uniformity by standardizing the weight-reporting
ing the as-built ship including the net effect of contract
system.
modifications.
1.2 This guide is applicable to ships designed and con-
3.1.3 center of gravity, n—the point through which the
structed in inch-pound units of measurement and to ships
resultant of all gravitational forces on a ship or a component
designed and constructed in SI units of measurement. When-
passes.Thelocation,abalancepoint,atwhichtheentireweight
everinch-poundunitsareshownorreferredtointhetext,orin
of a ship may be considered to be concentrated.
example formats included in this guide, it is to be understood
3.1.4 deadweight, n—the total carrying capacity of a ship
that corresponding SI units may be substituted if applicable to
a ship designed and constructed in SI units, provided that including weight of cargo, fuel, lubricating oil, fresh water in
whichever system is used, it is consistently used in all weight tanks, stores, passengers and baggage, and crew and their
control reporting documentation for the ship.
effects.
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/
performed by the shipbuilder shortly after award of the
ASTM SI 10)
shipbuilding contract based on the ship design information
3. Terminology available at the time of award. When compared with the
owner’s estimate and upon resolution of differences, an agreed
3.1 Definitions:
upon weight and center of gravity estimate will result.
3.1.1 agreed weight and center of gravity estimate, n—an
estimate of light ship weight and centers of gravity data,
3.1.7 light ship weight, n—theweightoftheshipwithallits
mutually agreed upon between the owner and the shipbuilder
equipment and outfit, including permanent (fixed) solid or
shortly after award of the shipbuilding contract, based on the
liquid ballast, spare parts that are carried on board, water in
boilers at operating levels, machinery including Marine Sani-
tation Device units in working condition, lubricating oil in all
This guide is under the jurisdiction of ASTM CommitteeF25 on Ships and
machinery, but not in storage tanks, and liquids in all piping
Marine Technology and is the direct responsibility of SubcommitteeF25.07 on
systems.
General Requirements.
Current edition approved Oct. 1, 2013. Published October 2013. Originally
3.1.8 longitudinal center of gravity (LCG), n—the point
approved in 1997. Last previous edition approved in 2008 as F1808–03 (2008).
DOI: 10.1520/F1808-03R13.
throughwhichthegravitationalforcesonashippass,measured
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
longitudinally from amidships, measured from the forward
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
perpendicular,orinsomecases,measuredfromtheaftperpen-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. dicular.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1808 − 03 (2013)
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
6. Procedure
throughwhichthegravitationalforcesonashippassmeasured
vertically from the keel (K) or the ship’s baseline. 6.1 Aspecified number of calendar days, that is, 30, 45, 60,
or 90 after date of award, as specified by the owner, the
3.1.11 weigh; to weigh, v—as commonly understood in
shipbuilder should submit for agreement an independent
everyday usage and in the maritime industry, and as used
weight and center of gravity estimate. This estimate should
throughout this guide, means to determine by measuring the
describe the weight and centers of gravity of the ship in
mass of.
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
should itemize such departures and their effect on light ship
design.Althoughtheweightcontroltechnicalrequirementsfor
weight and centers of gravity in his periodic reports. A final
commercial ships usually are less demanding than those for
report should be submitted at the time of delivery adjusted to
U.S. Navy surface ships, the need for a mechanism to control
bringtheestimatedlightshipweightandcentersofgravityinto
the weight of a ship still exists. Sections S1–S4 describe the
reasonable agreement with the inclining experiment results.
specific weight control technical requirements for U.S. Navy
surface ships.
5. Significance and Use U.S. Department of Transportation, Maritime Administration Classification of
Merchant Ship Weights, January 1985. Available from the U.S. Maritime
5.1 It is important to know the amount of weight and its
Administration, Office of Ship Construction, MAR 720, 400 Seventh St., SW,
location before the ship is built to be sure that when it is built Washington, DC 20590.
F1808 − 03 (2013)
7. Keywords
7.1 light ship; ship acquisition; weight control; weight
estimate; weight report
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 S2.2 accepted weight estimate (AWE), n—theAWE defines
the weight and centers of gravity of a ship that was awarded
S1.1 Government Documents, Drawings, and
under a specification-type contract using the information that
Publications—The following government documents,
was available at the time of contract award. It establishes
drawings, and publications form a part of this guide to the
contractual values for weight and KG and is the baseline for
extent specified herein. Unless otherwise specified, the issues
detail design and construction.
are those cited in the solicitation.
S2.3 acquisition margins, n—acquisition margins are
S1.1.1 Naval Sea Systems Command (NAVSEA) Docu-
weight and KG allowances included in the weight estimate to
ments:
cover the inherent limits of precision and the undefined
0900-LP-039-9020 Ship Work Breakdown Structure for
variationsofcomponentweightandcentersofgravitythattake
Nuclear Propulsion Plant (U)
placethroughoutthedesignphasesandduringtheconstruction
S9040-AA-IDX-010/SWBS 5D, Expanded Ship Work
of a ship. To provide for adequate weight control and configu-
Breakdown Structure, Vol I
ration control, acquisition margins are divided into five ac-
S9040-AA-IDX-020/SWBS 5D, Expanded Ship Work
counts: preliminary design margin, contract design margin,
Breakdown Structure, Vol II
detail design and building margin, contract modification
S1.2 Nongovernment Publications—The following docu-
margin, and government-furnished material (GFM) margin.
ment(s) form a part of this guide to the extent specified herein.
S2.4 actual weight, n—actual weight is the value obtained
Unlessotherwisespecified,theissuesofthedocuments,which
by a measurement of material on an accurate scale or other
are DOD adopted, are those listed in the issue of the Depart-
weighing device.
ment of Defense Index of Specifications and Standards
(DODISS) cited in the solicitation. Unless otherwise specified,
S2.5 allocated baseline weight estimate (ABWE), n—the
theissuesofdocumentsnotlistedintheDODISSaretheissues ABWE is the contractor’s definition of the weight and centers
of the documents cited in the solicitation (see S4.1).
ofgravityofashipthatwasawardedunderaperformance-type
S1.2.1 ANSI Document:
contract at the time of hull and propulsion configuration
X3.4 Code for Information Interchange
approval. It is the baseline for detail design and construction.
NOTE S1—Nongovernment standards and other publications normally
S2.6 baseline weight estimate (BWE), n—the BWE is any
are available from the organizations that prepare or distribute the
designated weight estimate that is used as a starting point in a
documents.Thesedocumentsalsomaybeavailableinorthroughlibraries
design phase for comparative analysis with subsequent weight
or other informational services.
estimates. Before contract award, the final estimate of each
S1.3 Order of Precedence—In the event of a conflict
designphaseisusuallythebaselineestimateforthesucceeding
between the text of this guide and the references cited herein,
phase.After contract award, theAWE orABWE usually is the
the text of this guide takes precedence. Nothing in this guide,
baseline estimate for the remainder of detail design and
however, supersedes applicable laws and regulations unless a
construction.
specific exemption has been obtained.
S2.7 bidder’s independent weight estimate (BIWE), n—the
bidder’s (or offeror’s) independent
...
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