Development of functional safety requirements for DP-driven servicing of wind turbines

Research output: Contribution to conferencePaper

Abstract

The adage “prevention is better than cure” is at the heart of safety principles. However, effective accident prevention is challenging in complex, highly automated systems such as modern DP-driven vessels, which are supposed to safely transfer technicians in often unfavourable environmental conditions. FMEA analysis, which is required for DP-driven vessels, is helpful to build-in a necessary level of redundancy and thereby mitigate consequences of failures, but not particularly helpful to inform preventive measures, not least against functional glitches in controlling software. In this paper we develop a set of functional safety requirements which are aimed at prevention of causal factors behind drift-off, drive-off and other hazardous scenarios. For this purpose, we use a systemic hazard analysis by STPA, which delivers both failure and interaction-based (reliable-but-unsafe) scenarios. The functional requirements cover both design and operational (human element related) requirements, which are then ranked based on our proposed heuristic. The ranking is not predicated on statistics or expert option but instead it is proportional to the number of hazardous scenarios a requirement protects against, hence indicating the relative importance of the requirement. The paper also summarises the suggested areas of safety improvement for DP-driven vessels.

Conference

ConferenceEuropean STAMP Workshop & Conference
Abbreviated titleESWC
CountryFinland
CityEspoo
Period18/09/1920/09/19
Internet address

Fingerprint

Wind turbines
scenario
accident prevention
technician
redundancy
environmental factors
ranking
heuristics
statistics
expert
Redundancy
Hazards
Statistics
interaction
software

Keywords

  • windfarm
  • wind turbine
  • dynamic positioning
  • service offshore vessel
  • technician transfer

Cite this

Puisa, R., Bolbot, V., & Ihle, I. (2019). Development of functional safety requirements for DP-driven servicing of wind turbines. Paper presented at European STAMP Workshop & Conference, Espoo, Finland.
Puisa, Romanas ; Bolbot, Victor ; Ihle, Ivar. / Development of functional safety requirements for DP-driven servicing of wind turbines. Paper presented at European STAMP Workshop & Conference, Espoo, Finland.
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note = "European STAMP Workshop & Conference, ESWC ; Conference date: 18-09-2019 Through 20-09-2019",
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Puisa, R, Bolbot, V & Ihle, I 2019, 'Development of functional safety requirements for DP-driven servicing of wind turbines' Paper presented at European STAMP Workshop & Conference, Espoo, Finland, 18/09/19 - 20/09/19, .

Development of functional safety requirements for DP-driven servicing of wind turbines. / Puisa, Romanas; Bolbot, Victor; Ihle, Ivar.

2019. Paper presented at European STAMP Workshop & Conference, Espoo, Finland.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Development of functional safety requirements for DP-driven servicing of wind turbines

AU - Puisa, Romanas

AU - Bolbot, Victor

AU - Ihle, Ivar

PY - 2019/9/18

Y1 - 2019/9/18

N2 - The adage “prevention is better than cure” is at the heart of safety principles. However, effective accident prevention is challenging in complex, highly automated systems such as modern DP-driven vessels, which are supposed to safely transfer technicians in often unfavourable environmental conditions. FMEA analysis, which is required for DP-driven vessels, is helpful to build-in a necessary level of redundancy and thereby mitigate consequences of failures, but not particularly helpful to inform preventive measures, not least against functional glitches in controlling software. In this paper we develop a set of functional safety requirements which are aimed at prevention of causal factors behind drift-off, drive-off and other hazardous scenarios. For this purpose, we use a systemic hazard analysis by STPA, which delivers both failure and interaction-based (reliable-but-unsafe) scenarios. The functional requirements cover both design and operational (human element related) requirements, which are then ranked based on our proposed heuristic. The ranking is not predicated on statistics or expert option but instead it is proportional to the number of hazardous scenarios a requirement protects against, hence indicating the relative importance of the requirement. The paper also summarises the suggested areas of safety improvement for DP-driven vessels.

AB - The adage “prevention is better than cure” is at the heart of safety principles. However, effective accident prevention is challenging in complex, highly automated systems such as modern DP-driven vessels, which are supposed to safely transfer technicians in often unfavourable environmental conditions. FMEA analysis, which is required for DP-driven vessels, is helpful to build-in a necessary level of redundancy and thereby mitigate consequences of failures, but not particularly helpful to inform preventive measures, not least against functional glitches in controlling software. In this paper we develop a set of functional safety requirements which are aimed at prevention of causal factors behind drift-off, drive-off and other hazardous scenarios. For this purpose, we use a systemic hazard analysis by STPA, which delivers both failure and interaction-based (reliable-but-unsafe) scenarios. The functional requirements cover both design and operational (human element related) requirements, which are then ranked based on our proposed heuristic. The ranking is not predicated on statistics or expert option but instead it is proportional to the number of hazardous scenarios a requirement protects against, hence indicating the relative importance of the requirement. The paper also summarises the suggested areas of safety improvement for DP-driven vessels.

KW - windfarm

KW - wind turbine

KW - dynamic positioning

KW - service offshore vessel

KW - technician transfer

M3 - Paper

ER -

Puisa R, Bolbot V, Ihle I. Development of functional safety requirements for DP-driven servicing of wind turbines. 2019. Paper presented at European STAMP Workshop & Conference, Espoo, Finland.