Hull Maintenance: Hull Maintenance MTPNO864 Hull Inspection Manual


Hull Inspection Manual: Hull Inspection Manual utilises DNV’s hull knowledge base is developed in close cooperation with the ship manager incorporates the ship manager’s maintenance standard and work processes easy to use and understand for ships crew and superintendents focuses on where to look and what to look for and how to report the inspection A practical approach to ship maintenance that:


Monitor the vital few……….: HFO heated tank high corrosion rate SWB high salinity high corrosion rate During ballasting in port oil film appears on the sea surface Port authorities require immediate action Ship to be repaired before leaving harbour Monitor the vital few……….


Monitor the vital few……….: Bulkhead Thickness Time Original t = 8 mm Coating breakdown Hole - Leakage Corroded, punctured t = 0-2 mm ~6 years ~10 years Pitting Corrosion Rate ~1,5-2 mm/year 4-5 years to identify the problem by - Visual inspection ~ 1,5 mm per year Monitor the vital few……….


Different service deliverables: Different service deliverables Services provided in order to establish and implement the hull inspection manual. Hull Inspection Manuals Ship specific Critical areas Inspection report forms Rating system Owners maintenance philosophy Owners acceptance criteria Implementation Training: Training of owner’s personnel involved in hull inspections


Hull Inspection Manuals: Hull Inspection Manuals Hull Inspection Manuals Ship specific Critical areas Inspection report forms Rating system Owners maintenance philosophy Ownersacceptance criteria Implementation Training: Training of owner’s personnel involved in hull inspections


Why Hull Inspection Manual: Why Hull Inspection Manual Be in control and document it Early detection of deficiencies Support the owner in complying with ISM code 10.1 & 10.2 OCIMF self assessment scheme Uniform technical hull standard across the fleet Used as a tool onboard for inspection Eases the communication between ship and shore


Hull Inspection Manual: Hull Inspection Manual Developed in close co-operation with the owner


Slide9: The longitudinals, located between the ballast and fully loaded waterline, are most exposed to fatigue cracks. Water Ballast Tanks – Fatigue Cracks


Slide10: Connections of inner bottom and bottom longitudinals with floors, transverse bulkhead and associated brackets. Water Ballast Tanks – Bot Long / Floor Connections


Slide11: Connection of horizontal stringers to inner hull at side. Especially the large flange terminations and at the toe. Side shell Cargo Tanks – Stringer / Inner Side Connections


Slide12: Cracking in side longitudinal bracket connection to transverse web frames (various locations) Cracking in web frame around scallops for side longitudinals (various locations) Fore Peak – Webframes / Side Shell Longs


Rating system for coating: Rating system for coating Coating


Rating of Corrosion: Rating of Corrosion Corrosion


Rating - structural deficiencies: Rating - structural deficiencies Deformation


Slide17: Naming of structure


Slide18: 1. 2. 3. 4. Photos may be taken at the same position every survey for monitoring of coating condition Document condition by photos


Example of reporting: Example of reporting


Example on reporting : Example on reporting Use of drawings Based on this report DNV prepared reinforcement proposal


Project plan: Project plan 2 weeks 2 weeks 2 weeks 2 weeks


Hull Inspection Manual: Hull Inspection Manual The system - in your pocket Inspection report forms


Training: Training Hull Inspection Manuals Ship specific Critical areas Inspection report forms Rating system Owners maintenance philosophy Ownersacceptance criteria Implementation Training: Training of owner’s personnel involved in hull inspections


Training alternatives: Training alternatives Hull Structure Course - SiO Tailor made hull inspection course Computer Based Training


Slide25: Consequence of crack in this detail ? Where is it likely to find damages? How are the loads taken up by the structure? Hull Structure Course - Objective Develop knowledge of basic hull strength and an understanding of how to perform a better hull survey.


Hull Structure Course - Ship in Operation: Hull Structure Course - Ship in Operation Class room course Two days Module 2: Basic hull strength Module 3: Structural connections Module 4: Hull structure failure types Module 5: Structural Breakdown, Bulk,Tank,Cont. & LPG Day 1 generic hull strength 2nd day Theory applied on your ship type Web – Primer


Tailor made hull inspection manual course : Tailor made hull inspection manual course Basic knowledge Class Hull strength and critical areas Coating and corrosion protection The inspection Planning Execution Evaluation Documentation


Slide28: DNV OWNER Tech/Operation Key personnel Tailor made hull inspection manual course CBT or onboard training Computer based training


Implementation: Implementation Hull Inspection Manuals Ship specific Critical areas Inspection report forms Rating system Owners maintenance philosophy Ownersacceptance criteria Implementation Training: Training of owner’s personnel involved in hull inspections


Implementation : Implementation Onboard visualisation journey Preparation of computer based training Regular audits ……..


Slide31: Thank you for your attention