Kevin Duffin - Martime Assurance & Consulting John Flynn- Stena Drilling
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1 DYNAMIC POSITIONING CONFERENCE October 11-12, 2016 RISK DP Undesired Events - Investigation and Methodology Kevin Duffin - Martime Assurance & Consulting John Flynn- Stena Drilling
2 DP Undesired Events Investigation and Methodology 11 October 2016
3 Summary Stena IceMAX - undesired events offshore Nova Scotia, Canada, 4 th December, 2015 Effective investigation strategy Root cause identified Remedial actions verified through proving trials Lessons learned
4 Stena IceMAX. Length ~ 750ft Breadth ~ 138ft Depth ~ 62ft Gross tonnage ~ 58, 295t World s 1 st DP, dual mast, ice class drillship Delivered 2012 from SHI, Korea Water depth ~ 9,800ft Drilling depth ~ 35,000ft DP 3 (DYNPOS AUTRO) notation Winterised Cold ( 30 C, 20 C) notation
5 Commissioning and Assurance. UK Flag State Registration Stena IceMAX Commissioned 2012 SHI Korea Stena Technical Commissioning Team Attendance IMCA standard, DNV approved FMEA DNV witnessed Proving Trials Annual DP Trials in accordance with IMCA M 191 Accepted by the Shell Assurance Team In line with Industry Best Practice
6 Stena IceMAX Worst Case Failure Design Intent (WCFDI) Port Redundancy Group DG 1 DG 2 Centre Redundancy Group DG 3 DG 4 Starboard Redundancy Group DG 5 DG 6 No single failure, as defined for DYNPOS AUTRO notation, will have a greater effect on the vessel s ability to maintain position and heading than the loss of one of the three power system redundancy groups (port, centre or starboard engine rooms / switchboard rooms) with the resulting loss of the associated 11kV switchboard, two diesel generators and two thrusters. Thruster 1 (centre bow) Thruster 3 (starboard bow) Thruster 2 (port bow) Thruster 4 (port stern) Thruster 6 (centre stern) Thruster 5 (starboard stern)
7 Location Cheshire Well, Offshore Nova Scotia, Canada
8 December 4 th, 2015 Wind speed 46kts 1.15am Several small vessel excursions (<5m) Vessel reverts to Blue (Advisory) status, as per WSOG G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
9 December 4 th, 2015 Wind speed 46kts 2.15am Five power limitation alarms on centre switchboard (ECR alarms) Drilling rate reduced to slow G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
10 December 4 th, 2015 Wind speed 46kts 3.40am Average power consumption ~ 40% G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
11 December 4 th, 2015 Large Wave ~ 10 mtr Wind speed 46kts 3.46am Vessel hit by rogue wave moves 13m astern Thrusters ramp up and load on each swbd increases (80 90%) G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
12 December 4 th, 2015 Wind speed 46kts 3.48am As vessel approaches original set point, thruster and bus load decreases rapidly Approaching set point, CBs for DGs 1 & 2 trip, blacking out swbd 1 DGs 1 & 2 remain running Vessel goes to Yellow status and prepares for disconnection G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
13 December 4 th, 2015 Wind speed 46kts 3.50am DG 4 also trips All thrusters operating at max and swbd load at 90 95% G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
14 December 4 th, 2015 Wind speed 46kts 3.55am High temps on DGs 1 & 2 so have to be stopped. DG 4 was still running after trip and was successfully reconnected to swbd G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
15 December 4 th, 2015 Wind speed 58kts 4.05am Wind increases to 58kts Vessel moves 35m from set point Thrusters ramp up and swbd load increases G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
16 December 4 th, 2015 Wind speed 58kts 4.05am When 1m away from set point, reduced power demand results in DG3 trip Power limitation alarms DG 3 reconnected Vessel regains position G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
17 December 4 th, 2015 Wind speed 46kts 6.00am DG 2 reconnected (05:36) DG 1 reconnected (05:43) Swbd 1 recovered and thrusters 1 and 4 back in DP G1 G2 G3 G4 G5 G6 Thruster Load 50% 75% 100%
18 Immediate Response Stena DP Marine / Technical Team Notified Canadian authorities Initiated investigation Mobilised multi-disciplined investigation team (OEM vendors, third party consultancies) Organised and led Bi-Daily technical meetings with Client Engaged MAC as independent for investigation in line with MTS TECHOP_GEN_03
19 Investigation MTS TECHOP_GEN_03, Conducting Effective and Comprehensive DP Incident Investigations 2AA 3AA 4AA 5AA Incident DATA 1 LFI PATHWAY SHORT TERM ACTIONS 6A 2BB 3BB 4BB 5BB
20 Investigation DESIGN OPERATIONS PROCESS PEOPLE DP PMS AVRs Protection relays Governors Environment DP FMEA Proving Trials Annual Trials DP Checklists WSOG Crew Response
21 Design - DP Control System DP system dynamically allocates thrust in response to weather Faults with system may result in thrust demand issues DP vendor technician mobilised to vessel to inspect DP control system configuration WIND POSITION REFs & SENSORS DP Control System and monitor trends Trends, event lists and alarm lists concluded DP system was operating as designed. Did not contribute to undesired events ALLOCATION OF THRUST
22 Design - Power Management System PMS interacts with DGs, thruster and drilling loads for a stable, balanced power system Configuration issues may result in mismanagement of the generators. PMS/VMS vendor technician mobilised to inspect PMS G1 Power Management System G2 G3 G4 G5 G6 Trends, event lists and alarm lists concluded that PMS did not contribute to undesired events
23 Design AVRs Reactive load sharing issues may lead to spurious tripping of generators OEM vendor technician mobilised to vessel to collect data from AVRs for off-site analysis On site inspection confirmed AVRs were configured correctly Did not contribute to undesired events
24 Design Protection Relays Incorrectly configured protection relays could lead to premature tripping of DGs OEM vendor technician collected data from protection relays Relays were reset and cleared while recovering DGs resulting in the loss of trip flags and data. Configuration files confirmed relays were set according to coordination study. Reverse power trip setting: -4% for 5s Reverse power trip reset: positive power for 1s Did not contribute to undesired events
25 Design - Engine Governors (Mechanical) Technicians from a local vendor investigated governor performance - simulated loads Hz and kw trends monitored during step load testing at 20% increments from 0% to 100% Mechanical calibration of actuator and fuel rack checked Performance stable across all loads and within tolerances Did not identify cause of undesired events Load Fuel rack position Set point actual DG 1 DG 2 DG 3 Time DG 4 DG 5 DG 6 Actuator Index
26 Design Engine Governors (Electrical) Technicians from OEM vendor investigated governor performance. Increased weather during investigation induced oscillation within power system identifying root cause of undesired event. Trending during this weather event indicated that paralleled generators were hunting between zero and 70-90%.
27 Generator Hunting Contributory Factors 1. Proportional gain set low resulting in speed deviations between reference and actual for minor load changes 2. Gain multiplier set for a narrow band (from 3 4rpm) resulting in small deviations in speed being significantly amplified High gain Medium gain Low gain Amplified load fluctuations may take longer to reach equilibrium Under significant load changes, generator response is amplified resulting in increased hunting across the set point reference
28 Design - Potential Root Cause Example plot of DG3 Over Power and References Heavy weather gives rise to rapid load changes 100 Power (%) Frequency of oscillation greater than the sample rate of the protection relay Hunting on parallel DGs oscillating in and out of reverse power Each trip relay sees 4 threshold 5s reverse power condition and trips DG 0 Time (s)
29 Operations - Environment Increased weather resulted in large and significant load changes on the vessel power plant as the DP System responded to maintain position Operated in harsh environments previously without incident The significant load changes highlighted governor tuning issues Cannot be considered a root cause
30 Process Key DP Documents Industry standard FMEA. Industry standard Proving Trials Industry standard Annual Trials. Industry standard DP Checklists... WSOG... All vessel documentation in compliance with rules, guidelines and industry best practice Industry standard documentation does not require that a vessel be tested / verified under extreme dynamic load conditions
31 People Crew Actions Experienced drilling and marine crew no previous incidents onboard the IceMAX The following can be concluded from review of crew witness statements: Post failure recovery of switchboards could have been better Vessel Master/OIM could have been alerted earlier to enable a faster response No human element contributed to the undesired events
32 Investigation Actions MTS TECHOP_GEN_03, Conducting Effective and Comprehensive DP Incident Investigations 2AA 3AA 4AA 5AA Incident DATA 1 LFI PATHWAY Root Cause governor tuning SHORT TERM ACTIONS 6A 2BB 3BB 4BB 5BB
33 Short Term Actions Investigation completed Governor tuning to dynamic load conditions Verifying trials created Interaction with Regulator and Client Amendment of WSOG (while Investigation in process) Incident reporting (IMCA)
34 Short Term Actions - Verifying Trials Proving trials offshore Nova Scotia 1 st and 2 nd January, 2016 Objective - demonstrate power plant stability under rapid and severe load changes: 1. Active (kw) load sharing.. 2. Reactive (kvar) load sharing.. 3. Verify reverse power protection.. 4. Verify PMS functionality... Governor tuning improved stability of power plant in response to dynamic load changes
35 Medium and Long Term Actions Lessons learned recorded in Stena Drilling HSE recording system Included in Stena Drilling Processes for the future: Governor tuning to be optimised during commissioning of new vessels OEM vendor approved training on specialist equipment Advanced drills for simulated DP failures and response
36 Conclusions Governor tuning issues hidden until significant load changes highlighted power system instability Stena Drilling initiated a thorough Incident Investigation, based on MTS TECHOP and identified root cause Remedial action was verified through proving trials
37 Conclusions (cont.) Stena Fleet DP trials updated to include significant step change testing. Regulator requesting step change testing for all DP vessel entry. Client adopted testing for on-hire DP Vessels. Open dialogue with Industry bodies for improvement.
38 Thanks for your time Kevin Duffin John Flynn UK Office +44 (0) America Office 1 (920) John.flynn@stena.com Direct No +44 (0) Mobile +44 (0)
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