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Marine Safety Center & T-Boat Stability Overview

Learn about the organization, plan review process, and T-Boat stability methods such as SST and Subchapter S. Understand weight changes, stability letter maintenance, and plan approval extensions. Get insights on plan review procedures, sister ship considerations, and essential resources provided by MSC.

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Marine Safety Center & T-Boat Stability Overview

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  1. Marine Safety Center & T-Boat Stability LT Leigh Sowers Staff Engineer, Small Vessel Branch (H-1) April 11, 2018

  2. Agenda MSC Overview: • Organization • Plan Review Process • Plan Approval Extension Vs. Sister Ship T-Boat Stability: • Ways to get a stability letter • Subchapter S vs. Simplified Stability Test • Differences in procedure & methodology • Maintaining a stability letter • Weight Changes

  3. MSC Overview Who we are: 70 personnel (50% active duty, 50% civilian) Consisting of 57 engineers What MSC Does: Commercial Vessel Plan Review ~50+% Provide Technical Guidance to the Field Classification Society/Third Party Oversight Policy Implementation and Interpretation Response & Investigation Support Salvage Engineering Response Team (SERT) What I do: H1 Plan Review Stability (Intact, Damage, Sail, etc.) Structures (Hull, Superstructure, Mast & Rigging, etc.) PSST Support

  4. MSC Organization CO XO SERT Tank Vessel & Offshore Engineering Tonnage Vessel Security Hull Small Vessels Machinery Major Vessels Electrical Hull Engineering Tank Vessel & Offshore Tonnage Vessel Security Small Vessels Machinery Vessel & Cargo Vessel & Cargo Major Vessels Electrical OCS OCS

  5. Plan Review Process PLANS RECEIVED VIA EMAIL & MAIL (msc@uscg.mil) • Reviewed on first in-first out basis • If you need something expedited, have the OCMI request PROJECT ENTRY, PRIORITIZATION & ASSIGNED TO MEMBER ENGINEERINGREVIEW PLAN APPROVAL &CORRESPONDENCE EMAIL DISTRIBUTION & RECORDKEEPING (MISLE) AVERAGE CYCLE TIME: 18 DAYS (GOAL OF 30 DAY MAX)

  6. Where to start? • 46 CFR 177.202 • List what plans are typically required • # of copies • OCMI may require additional info/plans • Determine who will review what • MTN 01-03 is a great tool for this • Plan Review Guides (PRGs) Plans MSC Typically Reviews: • Structure plans/calculations • Inclining/Stability calculations • Electrical diagrams/analysis • Piping Diagrams/calculations • Major Conversion determinations • Vital system automation Plans OCMI Typically Reviews: • Fire Safety Plans • Simplified Stability Tests • Drainage • Minor Equivalency Determinations • Minor Modifications/Repairs • General Arrangements

  7. MTN 01-03 Enclosure 1

  8. New Website! www.dco.uscg.mil/msc

  9. Plan Approval Extension Vs. Sister Ship • PAE (46CFR177.210) • Proper Documentation • Issued by approver of parent vessel (MSC or OCMI) • Extends Plans to future vessels with the following assumptions: • Built to Same Plans • No Reg Change • Owner of Plans specifically authorizes use • No modifications • All comments apply • Sister Vessels • Just Stability • NVIC 14-81 • Lightship Characteristics must be the same • Assumptions: • Same Yard • Same Plans • Within two years • Attestation by builder • Should we sister to an SST?...I don’t think so.

  10. Part II T-Boat Stability

  11. Ways to get a stability letter? • Two primary methods: • Simplified Stability Test (SST) CFR 178.330 • Subchapter S CFR Part 170 Subpart F • Deadweight Survey • Inclining Experiment (including Air Inclining) Subchapter S is always allowed!

  12. Simplified Stability Test • Simulate the most unstable loading condition • Heel the boat over and as long as it doesn’t heel too much (submerge the immersion mark), you are good! • It is a proof test: has no baseline to go back to and use for analysis

  13. Pontoon Simplified Stability Test • Protected Waters only • MSC Staff Engineer will assist with the test • Heel the boat over and do area calculations • It is a proof test: has no baseline to go back to and use for analysis

  14. Subchapter S Route • Deadweight Survey Outcomes: lightship weight, LCG, TCG, and assume a conservative VCG • Inclining Outcomes: lightship weight, LCG, TCG, VCG

  15. Which route is best for me?

  16. Modifications and Weight Changes Subchapter S: MTN 04-95 • Considers the aggregate weight change • Groups the weights into “known” or “unknown” categories • Based off the percentage of weight change in relation to the lightship value AND LCG shifts, dictates outcome

  17. Key Takeaways • MSC is here to support the field and work with submitters • MSC has robust processes but is always looking to improve, your input is wanted! • Effective communication (between the OCMI and submitter) will help reduce delays and frustration for all parties • Resources: • www.dco.uscg.mil/msc • Plan Review Guides (PRGs) • Marine Technical Notices

  18. Questions & Answers Teamwork · Excellence · Innovation · People

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