Microsoft PowerPoint

Document Sample
Microsoft PowerPoint Powered By Docstoc
					                   Risk

Analysis of Station Keeping Incident Data

                Pete Fougere
               Transocean, Inc.




              October 17-18, 2006



                                       Return to Session Directory
         Analysis of Station Keeping Incident Data




                                            Pete Fougere
                                            Transocean
                                            Sr. Engineering Mgr.




MTS DP Conference – Oct 2006
            Analysis of StationKeeping Incident Data


     •   Station keeping incident data
          – Reports prepared by the vessel after a “Loss of Position”
             event.
          – Observed wide range of scope and depth of DP Incident
             reports.

     •   The purpose of analysis of the DP incident data:
          – Improve equipment, procedures and training.
          – Make better design choices for new vessels.
          – Increase awareness of developing trends.




MTS DP Conference – Oct 2006
                 Incident Analysis Organizations



     Petrobras

     •   Database is proprietary.

     •   Analysis of the database is used to help avoid repetition of
         incidents
          – improve reliability of existing vessels
          – improve new contract bid specifications.




MTS DP Conference – Oct 2006
                  Incident Analysis Organizations



     Marine Technology Society DP Committee

     •   DP Incident Database
          – On website
          – Voluntary
          – Anonymous
          – Open to the public for
              • submittal of reports
              • data access




MTS DP Conference – Oct 2006
                   Incident Analysis Organizations


         International Marine Contractors Association (IMCA)

     •    Trade association for offshore, marine and underwater
          engineering companies.
     •    330 plus member companies worldwide.
     •    Major divisions
           – Diving
           – Marine
           – Remote controlled systems, including ROV’s
           – Offshore survey
     •    The Marine Division is active in analysis of DP Incident reports
           – They have produced a Annual DP Incident Analysis report
              each year since 1990
           – Recent publication of a Ten-Year DP Incident Analysis report




MTS DP Conference – Oct 2006
                      IMCA DP Incident process



     •   IMCA invites submittal of DP incident reports
          – Members and non-members can submit - voluntary
          – DP incident reports are proprietary to IMCA

     •   Annual DP Incident analysis report
          – Report is available to members and the public
          – Incident Report data is anonymized
          – Includes
              • Analysis of trends of triggers
              • Analysis of incident triggers
              • Incident trees for each incident report received




MTS DP Conference – Oct 2006
                     Ten Year Incident Analysis



     •   IMCA Analysis of Station Keeping Incident Data 1994-2003

          – Ten years of data together can be more effective in revealing
            trends and insight into causes of DP incidents
          – More extensive scope than annual report
          – 371 Incidents were analyzed for the report
          – Incidents were categorized as
              • LOP1 is Major Loss of Position
              • LOP2 is Minor Loss of Position




MTS DP Conference – Oct 2006
                                     Trends LOP1 - Major Loss of Position



                                                                                        DP Computer               Environment
                       LOP1 INCIDENT TRENDS - 1994 to 2003                              Power Generation          Operator Error
                                 - Initiating Event                                     References                Thruster
                                                                                        Electrical                TOTAL

                             20                                                                                              40




                             15                                                                                              30




                                                                                                                                   Total Number of LOP1s
       Number of LOP1s per
            Trigger




                             10                                                                                              20




                              5                                                                                              10




                              0                                                                                              0
                              1994     1995   1996   1997   1998          1999   2000          2001        2002           2003
                                                                   Year




MTS DP Conference – Oct 2006
           Trends LOP2 – Minor Loss of Position




MTS DP Conference – Oct 2006
                                      Trigger Comparison




                     LOP1 and LOP2 Trigger Comparison                                                  Loss of Position 1 (LOP1)

                                                                                                       Loss of Position 2 (LOP2)
               35%



               30%



               25%

           Percentage
               20%



               15%



               10%



                5%



                0%
                        Computer   Computer   Environment     Power      Operator Error   References   Thruster      Electrical
                        Hardware   Software                 Generation

                                                              Incident Trigger




MTS DP Conference – Oct 2006
                                                                  Blackouts



                                                           Full & Partial Blackout History
                                                                                                             Full Blackout

                               16%                                                                           Partial Blackout


                               14%


                               12%
         Percentage of Total




                               10%


                                8%


                                6%


                                 4%


                                 2%


                                 0%
                                      1994
                                             1995
                                                    1996                                                       Partial Blackout
                                                           1997
                                                                   1998
                                                                          1999                               Full Blackout
                                                                                 2000
                                                                  Year                  2001
                                                                                               2002
                                                                                                      2003




MTS DP Conference – Oct 2006
                                                                                              Blackouts




                                            Full Blackout - Open/Closed Bus Tie                                                                                    Partial Blackout - Open/Closed Bus Tie
                                                                                                     Open      Closed                                                                                                        Open      Closed
                       12%                                                                                                                    12%



                       10%                                                                                                                    10%
 Percentage of Total




                                                                                                                        Percentage of Total
                        8%                                                                                                                     8%



                        6%                                                                                                                     6%



                        4%                                                                                                                     4%



                         2%                                                                                                                     2%



                         0%                                                                                                                     0%
                              1994                                                                                                                   1994
                                     1995                                                                                                                   1995
                                            1996                                                            Closed                                                  1996
                                                   1997                                                                                                                    1997                                                     Closed
                                                           1998                                                                                                                    1998
                                                                  1999                                  Open                                                                              1999
                                                                         2000                                                                                                                    2000                           Open
                                                          Year                  2001
                                                                                       2002                                                                                       Year                  2001
                                                                                              2003                                                                                                             2002
                                                                                                                                                                                                                      2003




MTS DP Conference – Oct 2006
                                                                  Thrusters



                                                           Thrusters - Single or Multiple
                                                                                                             Multiple Thrusters

                              45%                                                                            Single Thruster


                              40%


                              35%
        Percentage of Total




                              30%


                              25%


                              20%


                               15%


                               10%


                                5%


                                0%
                                     1994
                                            1995
                                                   1996                                                       Single Thruster
                                                          1997
                                                                  1998
                                                                         1999                               Multiple Thrusters
                                                                                2000
                                                                 Year                  2001
                                                                                              2002
                                                                                                     2003




MTS DP Conference – Oct 2006
                                                              Operator Error



                                                      Operator Error - DPO, ERO or Elec/ET                                      Elec/ET
                                                                                                                                Other Party
                                                                                                                                ERO
                                 50%                                                                                            DPO


                                 45%

                                 40%

                                 35%
           Percentage of Total




                                 30%

                                 25%

                                  20%

                                  15%

                                  10%

                                   5%

                                   0%                                                                                DPO
                                        1994                                                                       ERO
                                               1995    1996
                                                              1997                                                Other Party
                                                                       1998
                                                                              1999                               Elec/ET
                                                                                     2000
                                                                     Year                   2001
                                                                                                   2002
                                                                                                          2003




MTS DP Conference – Oct 2006
                                                              Incident Type



                                     Incident Type - Single, Single + Hidden, Single + Operator                   Single + Operator
                                                                                                                  Single + Hidden
                                                                                                                  Single
                              80%


                              70%


                              60%
        Percentage of Total




                              50%


                              40%


                               30%


                               20%


                               10%


                                0%
                                      1994                                                                       Single
                                             1995
                                                    1996                                                       Single + Hidden
                                                           1997
                                                                   1998
                                                                          1999                               Single + Operator
                                                                                 2000
                                                                  Year                  2001
                                                                                               2002
                                                                                                      2003




MTS DP Conference – Oct 2006
                                                           Vessel Type Example



                                                                                                                                     LOP1
                                                                                                                                     LOP2
                                                                                    Drilling                                         LOP1 + LOP2




                            30%


                            25%
      Percentage of Total




                            20%


                            15%


                            10%

                                                                                                                                          LOP1 + LOP2
                            5%
                                                                                                                                      LOP2
                                                                                                                                   LOP1
                            0%
                                    DP          DP      Environment     Power      Operator   References   Thruster   Electrical
                                  Computer   Computer                 Generation    Error
                                  Software   Hardware


                                                                         Incident Trigger




MTS DP Conference – Oct 2006
                                                           Vessel Type Example



                                                                                                                                     LOP1
                                                                                                                                     LOP2
                                                                                      ROV                                            LOP1 + LOP2




                            45%

                            40%

                            35%
      Percentage of Total




                            30%

                            25%

                            20%

                            15%

                            10%                                                                                                           LOP1 + LOP2

                            5%                                                                                                        LOP2
                                                                                                                                   LOP1
                            0%
                                    DP          DP      Environment     Power      Operator   References   Thruster   Electrical
                                  Computer   Computer                 Generation    Error
                                  Software   Hardware


                                                                         Incident Trigger




MTS DP Conference – Oct 2006
     Position Loss Difference between DP Class 2 and DP Class 3

     •   Data did not show that the separation required by DP Class 3 has
         had any influence on the type or severity of DP incidents.

     •   No evidence could be found to show that the back-up DP control
         system had been used in earnest to stop a loss of position.




MTS DP Conference – Oct 2006
                   Human Factors


     • Human Factors
        – Poor procedures
        – Poor design
        – Insufficient test/commissioning/QA
        – Operator error

     • Improved human factors could reduce or
       eliminate 97% of incidents




MTS DP Conference – Oct 2006
                 New Failure Modes


     • Nearly all incidents are from well
       known sources of failure

     • Nine new failure modes in the ten
       year incidents




MTS DP Conference – Oct 2006
                            Closing Remarks



     •   Participate in DP Event reporting to MTS and to IMCA
          – www.dynamic-positioning.com
          – www.imca-int.com

     •   My thanks to IMCA for permission to use their ten-year incident
         report

     •   The annual and ten year incident reports are available at
         www.imca-int.com




MTS DP Conference – Oct 2006

				
DOCUMENT INFO