SafeHull Condition Assessment Program SH CAP

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SafeHull Condition Assessment Program (SH CAP)
Presented to INTERTANKO On 24 July 2003 in Miami,
FL
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ABS SH Condition Assessment Program
History

• Initiated in 1995, with SH development and VELA
  requirements for CAP ratings.
• Has included a fatigue analysis and buckling
  check since 1995, became mandatory with the BP
  requirement in 2001.
• Has maintained its structure since its inception,
  assess the whole vessel.
• Has adjusted to industry requirements

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ABS SH Condition Assessment Program
History

• Over 250 vessels through program to date. On
  pace for 65 this year.
• More charterers initiating CAP requirements,
  such as STATOIL, and Petronas.
• New players including Governments such as
  Indias announcement that foreign flag vessels
  over 20 years must have CAP 1 or 2 to enter
  terminals in India.

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ABS Condition Assessment Program

• Review of Class Records (Only IACS classed
  vessels)
• Fatigue Analysis to inform the owners surveyors
  of areas of concern
• SafeHull Condition Assessment Survey
• Verification of Gaugings
• SafeHull Structural Evaluation
• Grade assigned by Committee

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1. Review of Class Records

• Review of Class Records (IACS members)(LR, ABS,
  DNV, RINA, )
• Used by surveyors on board.
• Used by engineers for fatigue analysis for any
  modifications / steel renewals / repetitive
  fractures or lay-up periods.
• Not normally a deliverable.

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2. Fatigue Analysis

• Fatigue assessment of longitudinal stiffener
  connections.
• Fatigue assessment projected for 5 years.
• Identification of critical areas for owners and
  surveyors prior to survey.
• Identify areas for increased monitoring or repair.

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3. Condition Assessment Survey (Onboard)

• Independent of Class survey. But can be done in
  conjunction with ISH or SSH.
• Two approved surveyors.
• Close-up surveys of hull, machinery, equipment.
  This includes a close-up of 100 of the ballast
  and cargo tanks in the cargo block.
• Close-up survey of Hot Spot areas identified
  by fatigue analysis.
• Survey of vessel on dry-dock or UWILD.
• Representative photographs (Over 200).

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4. Verification of Gaugings

• Three girth belts within the 0.4L (cargo area)
  for tankers
• Surveyors will verify scope and accuracy of
  gaugings. The gaugings are conducted by clients
  contractor (ABS-approved external specialist)
• Input for structural (strength) evaluation of
  current condition

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5. SafeHull Structural Evaluation

• Strength of current structure compared to
  SafeHull criteria. Then against the as built
  requirements.
• S Curvesrenewal requirements vs. as gauged.
• Identify areas for increased monitoring or
  repair. A vessel with substantial corrosion,
  although OK for Class will not receive a Grade 2
  unless repaired within the 120 day survey period
  for the CAP.

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SafeHull Structural Evaluation

• Buckling
• Since its inception in 1995 SafeHull has
  incorporated the t3 minimum thickness (using the
  as-gauged condition) for buckling as a rule
  requirement for plates.
• Due to an influx of lighter scantling vessels
  applying for SHCAP a buckling check was added to
  the program in 2002 to address the deck and
  bottom longitudinals. This calculation uses the
  industry standard b/t (h/t) criteria.
• We use the h/t requirement as a first indicator
  and can do additional calculations to determine
  the minimum web thickness.

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SH CAP Structural Evaluation Categories

• No special comments or attention
• Under Class Every member is allowed to corrode
  a certain percentage before it must be replaced.
• SafeHull modifies this percentage it establishes
  a new as-built requirement for each member.
• In Strength the member properties are greater
  than 105 of the SafeHull renewal value.
• In Fatigue the connection has a continued life
  expectancy over the next 5 years.
• I.e., no additional requirements or attention
  beyond the normal Class requirements.

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SH CAP Structural Evaluation Categories

• Less sensitive
• In Strength the member properties are between
  100 and 105 of the SafeHull renewal value
  (Current ABS rules).
• If the member is Category 2 because of corrosion
  should be scheduled for replacement during next
  DD.
• In Fatigue the connection has an increased
  probability of failure in the next 5 years.
  Actual probability depends on age of vessel,
  trading conditions, time spent in DD.
• These members require increased monitoring and
  identified as must seen during regular
  inspections. For ABS-classed vessels these
  members may be passed on to ABS Class Document
  Center.

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SH CAP Structural Evaluation Categories

• Most sensitive
• In Strength the member is less than 100 of the
  SafeHull requirement
• In Fatigue the connection has a likely
  probability of failure in the next 5 years.
  Actual probability depends on age of vessel,
  trading conditions, time spent in DD.
• These members require replacement or increased
  monitoring on an annual or more regular basis.
• For ABS-classed vessels These members are passed
  on to ABS Class Document Center.

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What is Critical?
i.e., items that will be reported to Class for
regular inspection

• Category 3 in Section Modulus (the vessel no
  longer has 90 of the IACS required Section
  Modulus and MAY be considered for Class removal).
• Category 3 in Fatigue (likely probability of
  failure within the next 5 years).
• Category 3 in Strength Analysis - if substantial
  corrosion exists (less than 100 of SafeHull
  required renewal value remains). Vessel can not
  receive Grade 1 or 2 with Substantial
  corrosioni.e., items in Category 3 in Strength
  that do not have substantial corrosion may not
  necessarily require immediate repair (especially
  if they do not have history of failure)

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What is Increased Monitoring?
The vessel meets Class requirements but the
following items do not meet SafeHull requirements
and need to be examined more often than every 5
years

• Category 3 in Fatigue Repair or Inspect
  annually. The grading committee determines.
• Category 2 in Fatigue Inspection on an annual or
  2.5 years interval (inspections after SEVERE
  weather, minimum).
• Category 3 in Strength Analysis no substantial
  corrosion and no history of failures - inspect on
  an annual basis or 2.5 years along with the
  Category 2 connections.

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6. Condition Assessment Grading
Committee is made up of designated survey,
engineering, technology and management staff to
keep consistent application of the grading
process. Each member has a designated alternate
to assist in keeping the process moving.
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Deliverables for Condition Assessment

• Executive Summary
• Description of Program and the recap of the
  vessel grading
• Inspection Recommendations for Class Society
• Certificate with Grade
• Structural/Fatigue Analysis
• Condition Assessment Survey Report
• Photographs (To be provided electronically)

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SHCAP Improvementsduring the last year

• ABSC Average Certificate Turnaround Time
  7.0 weeks vs. 14.0 weeks for Competition
• Improved Overall Report Format, and include a
  Table of Recommendations Related to Fatigue
  Analysis/Structural Evaluation.
• Length for SHCAP moved 150 m to 130 m in
  length.
• Reduction in Size of Deliverables.

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SHCAP Improvementscoming in 2003

• Clearer presentation of gauging data relative
  to required.
• All deliverable information to be provided on
  CD
• SHCAP to cover LNG vessels

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Comments/Questions?