ASTM_F_3052_-_14.pdf

Designation:F305214An American National StandardStandard Guide forConducting Small Boat Stability Test(Deadweight Surveyand Air Inclining Experiment)to Determine Lightcraft Weightand Centers of Gravity of a Small Craft1This standard is issued under the fixed designation F3052;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONSmall craft operators,builders,buyers,accident investigators and others may be required todetermine the centers of gravity for their craft in order to apply stability criteria or perform otheranalyses.The conventional in-water stability test can be difficult to perform accurately on small craft,so an in-air inclining experiment may be specified.However,there are no guidelines available to helpstandardize and explain the process.This guide provides the marine industry with an understanding of an Air-Incline stability test forsmall craft.It contains procedures to ensure that valid results are obtained with precision at a minimalcost to owners,shipyards and the government.The guide is not intended to direct a person(s)in theactual calculations of the lightcraft weight and centers of gravity,but to be a guide to the recommendedprocedures required to gather accurate data for use in the calculation of the lightcraft characteristics.A complete understanding and documentation of proper procedures to conduct a stability test isparamount to confirm that the results gathered during the test can be examined for accuracy,especiallyby third parties subsequently reviewing the data.This guide is recommended to be used for all smallcraft capable of being lifted safely with forward and aft pick points capable of enduring additionalinclining weights to be used for the stability test.1.Scope1.1 This guide covers the determination of a small boatslightcraft characteristics.The air incline stability test can beconsidered two separate tasks;a deadweight survey and anair-inclining experiment.The stability test is recommended,but not required,for all small craft upon their constructioncompletion and/or after major conversions where stabilityinformation is required.It is typically conducted indoors andan enclosed facility to protect the vessels from unprotectedenvironmental conditions.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2F1321 Guide for Conducting a Stability Test(LightweightSurvey and Inclining Experiment)to Determine the LightShip Displacement and Centers of Gravity of a Vessel3.Terminology3.1 Definitions:3.1.1 inclining experimentcomprises moving a series ofknown weights in a transverse direction and then measuring theresulting change in the equilibrium heel angle of the craft.Thisinformation is used to calculate the vessels vertical center ofgravity.3.1.2 lightcrafta small craft,or boat in the lightest condi-tion(“Condition 1”)is a boat complete in all respects withoutconsumables,stores,cargo crew and effects and without any1This practice is under the jurisdiction of ASTM Committee F25 on Ships andMarine Technology and is the direct responsibility of Subcommittee F25.01 onStructures.Current edition approved Jan.1,2014.Published February 2014.DOI:10.1520/F3052-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 liquids on board except machinery fluids,such as lubricantsand hydraulics at operating levels.The lightcraft should be asdefined in the craft procurement or other specifications,or inthe operating manual,as to outfit permanently aboard,etc.3.1.3 deadweight surveycomprises weighing the vessel attwo longitudinal points to determine the total weight andlongitudinal center of gravity of the craft,then auditing allitems found on board to be added,deducted or relocated on thecraft at the time of the stability test so the observed conditionof the small craft can be adjusted to the specified lightcraftcondition.All loose items or outfit equipment(that is,anchor,anchor warp,dock lines,fire extinguishers,etc.)found onboard should be removed completely from the craft andweighed separately on a calibrated scale.3.1.4 keel(baseline)the datum point used for measuringthe vertical location of the pivot points and subsequentlydefining the vertical location of the weights involved in thetest.It is o