Review and Update of U.S. Coast Guard Vessel Stability Regulations and Guidance (2019) / Chapter Skim
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Pages 25-40
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25 Section 206(a) of the Save Our Seas Act of 2018 directs the U.S.
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26 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE 5. Identified several potentially desirable qualities of a lightship weight-tracking program for freight vessels.
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LIGHTSHIP WEIGHT CHANGE TRACKING 27 because of the high cost of taking a vessel out of service for the testing and the lack of a demonstrated need based on casualty data. After reviewing the NPRM comments and holding a series of public hearings, the USCG issued several rulemaking notices that curtailed the proposed requirements.
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28 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE BOX 3-1 Subchapter M Weight-Tracking Requirements for Towing Vessels § 144.315 Weight and moment history requirements for a vessel with approved lightweight characteristics.
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LIGHTSHIP WEIGHT CHANGE TRACKING 29 EXISTING GUIDANCE ON LIGHTSHIP WEIGHT TRACKING Although it is not in the Code of Federal Regulations, various guidance on when operators of inspected domestic passenger (non-SOLAS) , freight, and other vessels (except Subchapter M towing vessels)
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30 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE threshold values. Furthermore, when the changes from the modifications exceed these threshold values, it is widely understood in the industry that a deadweight survey or incline test should be performed.
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LIGHTSHIP WEIGHT CHANGE TRACKING 31 TABLE 3-1 Effect on Stability Compliance of Selected Passenger Vessel Types with Lightship Weight Changes Vessel Type Approximate Lightship Displacement (Long Ton(s)
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32 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE draft created by the larger lightship weights. By way of example, the 120-ft vehicle ferry barge barely misses the 15-degree heel to the downflooding point with a 5% weight increase.
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33 T A B L E 3 -2 E ff ec t on S ta bi lit y C om pl ia nc e of S el ec te d Fr ei gh t V es se l Ty pe s w it h L ig ht sh ip W ei gh t C ha ng es V es se l T yp e A pp ro xi m at e L ig ht sh ip W ei gh t (m et ri c to n)
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34 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE GM minus required GM) was used for the analysis.
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LIGHTSHIP WEIGHT CHANGE TRACKING 35 the USCG since the last deadweight survey or incline test as part of their submission for a proposed modification. It is important that a weight-tracking program have certain qualities to ensure that it records weight changes with a level of accuracy and timeliness so that it is used confidently, appropriately, and when needed.
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36 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE maintenance or operations, such as switching out machinery components or switching out a ship's mess chairs. When considering the accuracy needed for tracking these weight changes, the vessel type (e.g., tanker, ro-ro, container, car carrier)
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LIGHTSHIP WEIGHT CHANGE TRACKING 37 and shore-based personnel and (2) based on technologies that are in keeping with those typically used on board the vessel.
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38 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE and towing vessels subject to Subchapter M requirements. Nevertheless, the USCG requires that vessel operators report weight changes that arise because of vessel modifications and retain these records to know when stability calculations and tests may be needed in the future.
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LIGHTSHIP WEIGHT CHANGE TRACKING 39 this chapter. One might consider, for instance, whether an increase of 4% (or double the threshold value of 2% for known weight changes)
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