Review and Update of U.S. Coast Guard Vessel Stability Regulations and Guidance (2019) / Chapter Skim
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Pages 87-104
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From page 87... ...
The report from the first phase of the study provided a preliminary assessment of each part and subpart of Subchapter S to identify candidate updates or changes for the U.S. Coast Guard (USCG)
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From page 88... ...
88 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE 1. Identify significant stability-related hazards and rank them by likelihood and severity (risk)
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PRIORITIZING SUBCHAPTER S UPDATES AND CHANGES 89 to individual hazards. For illustration purposes, Table 7-1 assigns numerical scores of 3, 2, and 1 for high, medium, and low ratings, respectively.
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90 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE are changes that can be implemented by policy document or letter, as opposed to changes to federal regulations that require public notice and comment as part of the rulemaking process. Ease of change or implementation could likewise be ranked on a numerical scale -- for instance, a "2" might be assigned to a change that requires a complex rulemaking project, a "4" might be assigned to a change that would require a headquarters policy document (e.g., a Navigation and Vessel Inspection Circular)
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PRIORITIZING SUBCHAPTER S UPDATES AND CHANGES 91 Table 7-3 applies these weights to regulatory changes that affect risk and usability and that consider ease of implementation. The total score of each candidate change is obtained by adding the numerical score for each element with the weighting factor applied.
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92 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE TABLE 7-3 Risk Ranking Prioritization Matrix for Subchapter S Candidate Changes Cite Topic Comment Candidate Change C on se qu en ce s (C )
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PRIORITIZING SUBCHAPTER S UPDATES AND CHANGES 93 TABLE 7-3 Risk Ranking Prioritization Matrix for Subchapter S Candidate Changes Cite Topic Comment Candidate Change C on se qu en ce s (C )
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94 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE Cite Topic Comment Candidate Change C L R Number E C&H Ranking Part 174, Subpart E– Special Rules Pertaining to Specific Vessel Types Tugboats and Towboats Although this Subpart E appears to overlap with Part 173, Subpart E–Towing (see previous information in table) , it is necessarily separate because it applies to boats built as tugboats and towboats, and not just vessels that may carry out towing.
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From page 95... ...
PRIORITIZING SUBCHAPTER S UPDATES AND CHANGES 95 Cite Topic Comment Candidate Change C L R Number E C&H Ranking Part 174, Subpart E– Special Rules Pertaining to Specific Vessel Types Tugboats and Towboats Although this Subpart E appears to overlap with Part 173, Subpart E–Towing (see previous information in table) , it is necessarily separate because it applies to boats built as tugboats and towboats, and not just vessels that may carry out towing.
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96 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE Cite Topic Comment Candidate Change C L R Number E C&H Ranking Part 172, Subpart B– Special Rules Pertaining to Bulk Cargoes Grain In 170.030(b)
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From page 97... ...
PRIORITIZING SUBCHAPTER S UPDATES AND CHANGES 97 Cite Topic Comment Candidate Change C L R Number E C&H Ranking Part 172, Subpart B– Special Rules Pertaining to Bulk Cargoes Grain In 170.030(b)
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From page 98... ...
98 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE stability, capsizing, and flooding, but do not provide sufficient information to determine if any of these incidents were due to tripping. Internationally, Canadian statistics indicated four fatalities from three near-capsizing and eight capsizing because of tripping incidents over a 10-year period (1999– 2009)
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From page 99... ...
PRIORITIZING SUBCHAPTER S UPDATES AND CHANGES 99 a vessel to undergo a stability review if its lightship weight changes more than 2% or the longitudinal center of gravity shifts more than 1% of the length between perpendiculars. Although potential weight creep may not exceed these values from the result of any one change, accumulated weight creep over time could be an issue, although detecting any of these small changes can be difficult.
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100 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE Watertight doors prevent the ingress of water from one compartment to another during flooding or accidents. Watertight doors may be inadvertently left open during navigation, which creates a risk to the required damage stability survivability of a ship.
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PRIORITIZING SUBCHAPTER S UPDATES AND CHANGES 101 if any, would involve the APA rulemaking process. Implementation of any change would better harmonize Part 174, Subpart E, with the 2008 IS Code, Part A
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102 USCG VESSEL STABILITY REGULATIONS AND GUIDANCE suggested by the committee. If not, vessels could update their stability documentation to include the additional criteria that will be applied to similar vessels under the updated CFR.
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From page 103... ...
PRIORITIZING SUBCHAPTER S UPDATES AND CHANGES 103 or operation. There does not appear to be a reason to exempt vessels larger than 100 m from this requirement because a similar requirement applies to these vessels in the 2008 IS Code.
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