ASTM F1808-97a

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.

General Information

• Status: Historical
• Publication Date: 09-Nov-1997
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.07 - General Requirements

Relations

• Replaced By: ASTM F1808-97a(2002) - Standard Guide for Weight Control Technical Requirements for Surface Ships
• Effective Date: 10-Nov-1997

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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: F 1808 – 97a An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Guide for
1
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 passes. The location, a balance point, at which the entire weight
of a ship may be considered to be concentrated.
1.1 This guide provides recommended weight control tech-
3.1.4 deadweight, n—the total carrying capacity of a ship
nical requirements for surface ships and discusses different
including weight of cargo, fuel, lubricating oil, fresh water in
types of weight estimates, reports, and weight control proce-
tanks, stores, passengers and baggage, and crew and their
dures. It contains a weight classification that will assist in
effects.
achieving uniformity by standardizing the weight-reporting
3.1.5 inclining experiment, n—a procedure performed on a
system.
completed, or almost completed, ship to establish experimen-
1.2 This guide is applicable to ships designed and con-
tally the light ship values of the displacement and the vertical,
structed in inch-pound units of measurement and to ships
longitudinal, and transverse positions of its center of gravity
designed and constructed in SI units of measurement. When-
(see Guide F 1321 for detailed procedures).
ever inch-pound units are shown or referred to in the text, or in
3.1.6 independent weight and center of gravity estimate,
example formats included in this guide, it is to be understood
n—the estimate of light ship weight and centers of gravity
that corresponding SI units may be substituted if applicable to
performed by the shipbuilder shortly after award of the
a ship designed and constructed in SI units, provided that
shipbuilding contract based on the ship design information
whichever system is used, it is consistently used in all weight
available at the time of award. When compared with the
control reporting documentation for the ship.
owner’s estimate and upon resolution of differences, an agreed
2. Referenced Documents upon weight and center of gravity estimate will result.
3.1.7 light ship weight, n—the weight of the ship with all its
2.1 ASTM Standards:
equipment and outfit, including permanent (fixed) solid or
F 1321 Guide for Conducting a Stability Test (Lightweight
liquid ballast, spare parts that are carried on board, water in
Survey and Inclining Experiment) to Determine the Light
2
boilers at operating levels, machinery including Marine Sani-
Ship Displacement and Centers of Gravity of a Vessel
tation Device units in working condition, lubricating oil in all
F 1332 Practice for Use of SI (Metric) Units in Maritime
2
machinery, but not in storage tanks, and liquids in all piping
Applications (Committee F-25 Supplement to E 380)
systems.
3. Terminology
3.1.8 longitudinal center of gravity (LCG), n—the point
through which the gravitational forces on a ship pass, measured
3.1 Definitions:
longitudinally from amidships, measured from the forward
3.1.1 agreed weight and center of gravity estimate, n—an
perpendicular, or in some cases, measured from the aft perpen-
estimate of light ship weight and centers of gravity data,
dicular.
mutually agreed upon between the owner and the shipbuilder
3.1.9 transverse center of gravity (TCG), n—the point
shortly after award of the shipbuilding contract, based on the
through which the gravitational forces on a ship pass, measured
ship design information, for example, specifications, drawings,
transversely, port or starboard, from the ship’s centerline.
and so forth, available at the time of award.
3.1.10 vertical center of gravity (KG or VCG), n—the point
3.1.2 as-built weight and center of gravity estimate, n—a
through which the gravitational forces on a ship pass measured
detailed final estimate of light ship weight and centers of
vertically from the keel (K) or the ship’s baseline.
gravity data, adjusted for inclining experiment results, reflect-
3.1.11 weigh; to weigh, v—as commonly understood in
ing the as-built ship including the net effect of contract
everyday usage and in the maritime industry, and as used
modifications.
throughout this guide, means to determine by measuring the
3.1.3 center of gravity, n—the point through which the
mass of.
resultant of all gravitational forces on a ship or a component
3.1.12 weight, n—as commonly understood in everyday
usage and in the maritime industry, and as
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