Review of U.S. Coast Guard Vessel Stability Regulations (2018) / Chapter Skim
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Pages 84-94
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84 APPENDIX D CONTENT AND ORGANIZATION ISSUES WITH SUBCHAPTER S This appendix provides examples of Parts of Subchapter S that have issues with the content or organization that are worth resolving by the U.S. Coast Guard (USCG)
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85 Box D-1 170.295 Special Consideration for Free Surface of Passive Roll Stabilization Tanks (a) The virtual increase in the vertical center of gravity due to a liquid in a roll stabilization tank may be calculated in accordance with paragraph (b)
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86 (available freeboard) / (beam)
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87 174.015(b) Intact Stability (Deck Cargo Barges)
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88 Downflooding Point In reviewing the downflooding definitions, there are three different definitions for the downflooding point: 1. Any opening, 170.055(e)
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89 "rapidly" is used, which is not defined in Subchapter S and is another example of unclear wording. Permeability Factor Another example of conflicting definitions of the same stability requirements located in two or more locations in the Subchapter S regulations are the permeability factors used in the damaged stability calculations.
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90 Box D-4 (continued) Permeability Definition Excerpts From Subchapter S - 172.065(f)
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91 One example of conflicting requirements is between Section 171.072 and Section 171.080(c) , both of which are for passenger vessels with Type II subdivision.
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92 Another place where the Subchapter S regulations are missing key definitions is in how a vessel's intact and damaged stability are to be calculated. For example, in Subchapter S the method of free surface (Subpart I -- Free Surface)
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93 implemented. Further confusion for the users of Subchapter S is created because these policy decisions are contained in many of the following USCG documents: Navigation and Vessel Inspection Circulars (NVICs)
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94 would be carried out using newer computational capabilities. For example, Subchapter S still uses static intact stability criteria solely based on initial GM (metacentric height)
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