ASTM F1808-97a(2002)
(Guide)Standard Guide for Weight Control Technical Requirements for Surface Ships
Standard Guide for Weight Control Technical Requirements for Surface Ships
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: F 1808 – 97a (Reapproved 2002)
Standard Guide for
Weight Control Technical Requirements for Surface Ships
This standard is issued under the fixed designation F 1808; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.2 as-built weight and center of gravity estimate, n—a
detailed final estimate of light ship weight and centers of
1.1 This guide provides recommended weight control tech-
gravity data, adjusted for inclining experiment results, reflect-
nical requirements for surface ships and discusses different
ing the as-built ship including the net effect of contract
types of weight estimates, reports, and weight control proce-
modifications.
dures. It contains a weight classification that will assist in
3.1.3 center of gravity, n—the point through which the
achieving uniformity by standardizing the weight-reporting
resultant of all gravitational forces on a ship or a component
system.
passes. The location, a balance point, at which the entire weight
1.2 This guide is applicable to ships designed and con-
of a ship may be considered to be concentrated.
structed in inch-pound units of measurement and to ships
3.1.4 deadweight, n—the total carrying capacity of a ship
designed and constructed in SI units of measurement. When-
including weight of cargo, fuel, lubricating oil, fresh water in
ever inch-pound units are shown or referred to in the text, or in
tanks, stores, passengers and baggage, and crew and their
example formats included in this guide, it is to be understood
effects.
that corresponding SI units may be substituted if applicable to
3.1.5 inclining experiment, n—a procedure performed on a
a ship designed and constructed in SI units, provided that
completed, or almost completed, ship to establish experimen-
whichever system is used, it is consistently used in all weight
tally the light ship values of the displacement and the vertical,
control reporting documentation for the ship.
longitudinal, and transverse positions of its center of gravity
2. Referenced Documents
(see Guide F 1321 for detailed procedures).
3.1.6 independent weight and center of gravity estimate,
2.1 ASTM Standards:
n—the estimate of light ship weight and centers of gravity
F 1321 Guide for Conducting a Stability Test (Lightweight
performed by the shipbuilder shortly after award of the
Survey and Inclining Experiment) to Determine the Light
shipbuilding contract based on the ship design information
Ship Displacement and Centers of Gravity of a Vessel
available at the time of award. When compared with the
F 1332 Practice for Use of SI (Metric) Units in Maritime
owner’s estimate and upon resolution of differences, an agreed
Applications (Committee F25 Supplement to IEEE/
upon weight and center of gravity estimate will result.
ASTM-SI-10)
3.1.7 light ship weight, n—the weight of the ship with all its
3. Terminology
equipment and outfit, including permanent (fixed) solid or
liquid ballast, spare parts that are carried on board, water in
3.1 Definitions:
boilers at operating levels, machinery including Marine Sani-
3.1.1 agreed weight and center of gravity estimate, n—an
tation Device units in working condition, lubricating oil in all
estimate of light ship weight and centers of gravity data,
machinery, but not in storage tanks, and liquids in all piping
mutually agreed upon between the owner and the shipbuilder
systems.
shortly after award of the shipbuilding contract, based on the
3.1.8 longitudinal center of gravity (LCG), n—the point
ship design information, for example, specifications, drawings,
through which the gravitational forces on a ship pass, measured
and so forth, available at the time of award.
longitudinally from amidships, measured from the forward
perpendicular, or in some cases, measured from the aft perpen-
This guide is under the jurisdiction of ASTM Committee F25 on Ships and
dicular.
Marine Technology and is the direct responsibility of Subcommittee F25.07 on
3.1.9 transverse center of gravity (TCG), n—the point
General Requirements.
through which the gravitational forces on a ship pass, measured
Current edition approved Nov. 10, 1997. Published November 1998. Originally
approved in 1998. Last previous edition approved in 1998 as F 1808 – 97a. transversely, port or starboard, from the ship’s centerline.
Annual Book of ASTM Standards, Vol 01.07.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
F 1808 – 97a (2002)
3.1.10 vertical center of gravity (KG or VCG), n—the point 6. Procedure
through which the gravitational forces on a ship pass measured
6.1 A specified number of calendar days, that is, 30, 45, 60,
vertically from the keel (K) or the ship’s baseline.
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
sheets showing the detailed work performed, for example,
3.1.12 weight, n—as commonly understood in everyday
calculations and estimates based on the design information,
usage and in the maritime industry, and as used throughout this
drawings, specification, and so forth. Appendix X1 contains
guide, is synonymous with mass. In this guide, weight in
suggested forms for the independent estimate, and it includes a
inch-pound units is measured in pounds and in long tons of
2240 lbs; and in SI units (metric), weight is measured in suggested weight classification system for the estimate. Terms
used in the weight classification are defined in the Maritime
kilograms and in metric tons of 100 kg. Refer to Practice F
1332 for conversion factors to convert inch-pound quantities to Administration Publication, Classification of Merchant Ship
Weights.
SI (metric) quantities for units of weight, moment, moments to
trim, and so forth. 6.2 A mutual agreement between the shipbuilder and the
owner on the light ship weight and centers of gravity should be
3.1.13 weight classification, n—the system used in light
reached as quickly as possible after award of the shipbuilding
ship weight estimating for grouping materials, equipment, or
contract. Agreement action should consist of a review of
components of the ship in a structured order to facilitate
shipbuilder’s independent weight and center of gravity esti-
comparison and to ensure completeness.
mates and comparison with the owner’s estimate. Upon reso-
3.1.14 weight group, n—one of the three major elements of
lution of differences, an agreed upon weight and center of
light ship weight as used in the weight classification, that is,
gravity estimate will result. Thereafter, the shipbuilder should
hull structure, outfit, and machinery.
be responsible for obtaining in the completed vessel the agreed
upon weight and center of gravity characteristics adjusted for
4. Summary of Guide
authorized departures from the contracted ship design, re-
4.1 Determination of Weight and Moment Data—The
flected in the agreed upon estimate.
weight and moment data for all components and material and
6.3 Departures from the contracted ship design, reflected in
their overall effect on the ship’s weight, center of gravity, list,
the agreed upon estimate, which affect the light ship weight
and trim should be determined. As ship design or ship
and centers of gravity, should not be undertaken until the
construction drawings are prepared and as material is selected,
shipbuilder has submitted to the owner his estimate of the
acquired, or received, the weight and centers of gravity of all
effect on weight and centers of gravity of the ship and obtained
items that comprise the ship should be determined and reported
written approval to proceed with the department. Departures,
in the weight estimates and reports. These data may be
which have a total impact on any weight group of less than a
obtained by estimation or calculation during preliminary and
specified percentage, that is, 0.01, 0.02, 0.03, or 0.04 % of the
contract design, by a combination of estimation or calculation
light ship weight, may be considered negligible and will not
of ship construction drawings, and by actual weight determi-
require written approval with respect to weight.
nation of items during detail design and construction.
6.4 The shipbuilder should submit periodically, as agreed
4.2 Weight Reporting and Control—The procedures for
upon, to the owner, a tabulation of approved departures and
weight reporting and control, regardless of the level of report- their cumulative effect on weight and centers of gravity of the
ing, are described in Section 6 and apply for commercial ships.
agreed light ship estimate. In addition, when submitting plans
The method and frequency of weight reporting can vary that involve departures from the type of construction in the
depending on the specific ship design, as well as the technical
contracted ship design, reflected in the estimate, the shipbuilder
requirements set forth in the contract. The extent and level of should itemize such departures and their effect on light ship
weight control also can vary depending on the specific ship
weight and centers of gravity in his periodic reports. A final
design. Although the weight control technical requirements for report should be submitted at the time of delivery adjusted to
commercial ships usually are less demanding than those for
bring the estimated light ship weight and centers of gravity into
U.S. Navy surface ships, the need for a mechanism to control
reasonable agreement with the inclining experiment results.
the weight of a ship still exists. Section S-10 describes the
specific weight control technical requirements for U.S. Navy
7. Keywords
surface ships.
7.1 light ship; ship acquisition; weight control; weight
estimate; weight report
5. 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
U.S. Department of Transportation, Maritime Administration Classification of
it will have positive stability. Only through detailed weight
Merchant Ship Weights, January 1985. Available from the U.S. Maritime Admin-
estimating in the design stage and during construction can one
istration, Office of Ship Construction, MAR 720, 400 Seventh St., SW, Washington,
be ensured that positive stability will be achieved and retained. DC 20590.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
F 1808 – 97a (2002)
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 contractual values for weight and KG and is the baseline for
detail design and construction.
S1.1 Government Documents, Drawings, and
S2.3 acquisition margins, n—acquisition margins are
Publications—The following government documents, draw-
weight and KG allowances included in the weight estimate to
ings, and publications form a part of this guide to the extent
specified herein. Unless otherwise specified, the issues are cover the inherent limits of precision and the undefined
variations of component weight and centers of gravity that take
those cited in the solicitation.
S1.1.1 Naval Sea Systems Command (NAVSEA) Docu- place throughout the design phases and during the construction
ments: of a ship. To provide for adequate weight control and configu-
0900-LP-039-9020 Ship Work Breakdown Structure for ration control, acquisition margins are divided into five ac-
Nuclear Propulsion Plant (U) counts: preliminary design margin, contract design margin,
S9040-AA-IDX-010/SWBS 5D, Expanded Ship Work detail design and building margin, contract modification mar-
Breakdown Structure, Vol I gin, and government-furnished material (GFM) margin.
S9040-AA-IDX-020/SWBS 5D, Expanded Ship Work
S2.4 actual weight, n—actual weight is the value obtained
Breakdown Structure, Vol II
by a measurement of material on an accurate scale or other
S1.2 Nongovernment Publications—The following docu-
weighing device.
ment(s) form a part of this guide to the extent specified herein.
S2.5 allocated baseline weight estimate (ABWE), n—the
Unless otherwise specified, the issues of the documents, which
ABWE is the contractor’s definition of the weight and centers
are DOD adopted, are those listed in the issue of the Depart-
of gravity of a ship that was awarded under a performance-type
ment of Defense Index of Specifications and Standards (DO-
contract at the time of hull and propulsion configuration
DISS) cited in the solicitation. Unless otherwise specified, the
approval. It is the baseline for detail design and construction.
issues of documents not listed in the DODISS are the issues of
S2.6 baseline weight estimate (BWE), n—the BWE is any
the documents cited in the solicitation (see S4.1).
6 designated weight estimate that is used as a starting point in a
S1.2.1 ANSI Document:
design phase for comparative analysis with subsequent weight
X3.4 Code for Information Interchange
estimates. Before contract award, the final estimate of each
NOTE S1—Nongovernment standards and other publications normally
design phase is usually the baseline estimate for the succeeding
are available from the organizations that prepare or distribute the
phase. After contract award, the AWE or ABWE usually is the
documents. These documents also may be available in or through libraries
baseline estimate for the remainder of detail design and
or other informational services.
construction.
S1.3 Order of Precedence—In the event of a conflict
S2.7 bidder’s independent weight estimate (BIWE), n—the
between the text of this guide and the references cited herein,
bidder’s (or offeror’s) independent weight estimate is prepared
the text of this guide takes precedence. Nothing in this guide,
by
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