DI-SESS-81404A

Weight and Stability Reports for In-Service Surface Ships

Requires weight and stability reporting for in-service ships to verify weight and center-of-gravity values remain within Naval Architectural limits and stability is not compromised by authorized alterations.

Approval DateJune 9, 2011

AMSC NumberN9202

Preparing Activity—

Project Number—

OPRSH/SEA 05P3

DTIC Applicable—

GIDEP Applicable—

Limitation—

Applicable Forms—

Approval Limitation—

Form Version—

DID Formatdd_form_1664

963C CompliantNo

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

Supersedes

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Description & Purpose

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Application & Interrelationship

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Use & Relationship

Weight and Stability reporting is required for in-service ships to ensure that ship's weight and height of center of gravity above the bottom of the keel (KG) values are within the Naval Architectural limits and that stability characteristics are not compromised, as a result of authorized alterations. It provides the basis for planning for corrective or compensation for adverse conditions.

This DID contains the format and content preparation instructions for the data product generated by the specific and discrete task requirement as delineated in the contract.

Preparation Instructions

1FormatThe report shall be in contractor's format.

2ContentThe report shall contain:

2.1A table of contents

2.2For each ship, the report shall includelight ship (Condition A) and full load (Condition D) displacement (in long tons), condition expected at the end of availability and recommended ballast or compensation measures.

2.3For each availability, a matrix or tableshowing alteration number with title description. For each alteration, show weight added or removed (pounds), height of vertical center of gravity above baseline and associated moment, distance of the longitudinal center of gravity from the mid-perpendicular reference point and associated moment, and distance of the transverse center of gravity from the centerline and associated moment. All levers are carried to nearest hundredth of a foot and all moments are carried to nearest a foot-pound. Vertical levers shall be indicated by a "+" or a blank for above the baseline, and a "-" for below the baseline. Longitudinal levers shall be indicated by an "F" or an "-" for forward of the mid-perpendicular reference point, and an "A", a "+" or a blank for aft of the mid-perpendicular reference point. Transverse levers shall be indicated by a "P", a "+" or a blank for port, and an "S" or a "-" for starboard. When an alteration causes a change in loads, include in the table with the appropriate sign.

2.4By hull, a Stability Summary of

2.4.1Full load displacement (long tons)

2.4.2KG (feet)

2.4.3Date of last inclining experiment

2.4.4Current ballast installed (long tons)

2.4.5Recommendations for inclining

2.5Summaries for all required loading conditionsand their associated drafts (forward, aft, and mean), list, trim, KG, and metacentric height, uncorrected and corrected for free surface affect of liquids in tanks. Include effects of changes of loads as well as weight and moment of alteration installations.

2.6Analysis results and discussion of reasonsfor weight changes from prior reports, and recommendations for reversing unsatisfactory trends, such as exceeding established Naval Architectural limits. Include recommendations for weight removals for compensations, ballast adjustments, need for an inclining experiment, and impact of future alterations.

2.7Background information, studies, directives, correspondenceand all detailed calculations pertaining to weights, including density factor. Where applicable, include alteration Weight and Moment Worksheets as background information.

3Media RequirementsThe media requirements shall be as specified in the contract.

References

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