AS Planning a Safety Management Study

Transcription

1 AS Planning a Safety Management Study Richard McDonough Manager Engineering and Policy Petroleum & Geothermal Group PIRSA

2 Objectives of revision Session Outline What have we done? - overview What does the Safety Management Process look like in AS ? How do you carry out an effective Safety Management Study? Group discussion Study example Review of AS 2885 guidance Wrap up

3 Objectives of Revision Reflect industry experience and practice Incorporate flowchart Clarify terminology Provide guidance on defining threats and establishing effective controls Multiple independent measures Incorporate calculation methods and research information Include no rupture and maximum release rates in high consequence areas Provide guidance on ALARP Map to other risk standards and practice (AS4360, 5 x 5 matrix)

4 Objectives of revision (cont) Actions for in-service pipelines Provide for numerical methods where appropriate Require HAZOPs for stations Emphasise informed decision-making Provide guidance on integrity of process Provide guidance on minimum data and skill requirements Address whole-of-life safety management Strengthen links between Part 1 and Part 3 (SAOP) Address threats during construction etc Improve environmental safety management

5 Safety Management Sections Section 1.4 Definitions Section 2 Safety Section 4 Design general Location classification, signs, high consequence areas, fracture control, energy discharge rate, resistance to penetration, etc Section 5.5 External interference protection Appendix B Safety management process Appendix C Threats Appendix D Design considerations for external interference protection Appendix E Effectiveness of procedural controls for the prevention of external interference damage to pipelines Appendix F Qualitative risk assessment Appendix G ALARP Appendix H Integrity of safety management process Appendix I Environmental management Appendix Y Radiation contour

6 Basic concepts and principles 1997 first standard in the world to specifically mandate external interference protection design Protect pipeline from people to protect people from the pipeline (EIP) Specific threats to specific pipelines at specific locations Must define threats to design for them Design solutions must be effective Approval and documentation Informed decision-making Safety management not risk assessment

7 Life Cycle Safety Management Preliminary Design & Approval Detailed Design Construct & Commission Operate, Maintain, Modify Abandon Preliminary design, route selection, environmental studies, initial risk studies for consultation & approvals Detailed design, detailed risk studies as part of design process, HAZOPs etc, review & validation Pre-construction & precommissioning reviews change of use, design life review, MAOP increase, change of threats, not exceeding 5 years Abandonment plan includes risk study

8 Safety Management Process Overview Threat identification / location analysis Threat control Threat controlled Failure analysis No failure More controls Risk evaluation More treatment Risk treatment Treated Management Plan (SAOP) ACCEPTED RISK

9 Process detail Threat identification / location analysis Threat control Failure analysis (as required) Risk Evaluation (as required) Risk Treatment (as required) Management Plan Design description, location analysis, threat ID and specification, non-location specific threats, common threats / typical designs Demonstrate effective physical and procedural controls for external interference, established design and procedures for other threats, HAZOPs etc Can uncontrolled threats lead to failure? Analyse consequence, specify frequency, risk matrix for risk evaluation Risk treatment actions according to risk level Component of SAOP, ongoing monitoring and review

10 Planning a Safety Management Study Objective Robust study Documented and approved Justifies confidence Section Safety management study validation Each detailed safety management study shall be validated by a properly constituted workshop which shall critically review each aspect of the safety management study

11 Discussion good and bad experiences Draw on experience in the room When has the process worked well? When has it not worked well? What elements are critical to success or failure?

12 Example: New Roma to Brisbane Pipeline Overview of pipeline route What can people in the room tell me? What can we glean from the maps? What do we need to do to carry out the study? How do we get what we need?

13 New Roma to Brisbane Pipeline

14 Roma

15 1. Roma to Condamine

16 2. Condamine to Dalby

17 3. Dalby to Gatton

18 4. Gatton to Brisbane

19 Brisbane Area

20 Brisbane Gate Station

21 Tasks View selected sections of the line Discuss location class and threats Discuss data gathering

22 Initial Section

23 Isolated house

24 Rural Development

25 Town Development

26 Coal Seam Methane

27 Kogan North CSM Project

28 CSM licence information

29 Cultivated Land

30 Cultivated land

31 Urban Growth Corridor?

32 Suburban / Sensitive

33 Suburban / Sensitive

34 Appendix B Safety Management Process Normative Integrated and continuous over pipeline life-cycle Pitfalls Project Phases Requirements for detailed safety management study Shall be undertaken by personnel with expertise in each component of the design, construction and operation of the pipeline, including, or with the support of, personnel closely familiar with land uses along the entire route Data and information

35 SMS Data requirements Design basis / operation philosophy Design calculations Initial route Initial SMS Design drawings Typical designs SMS of common threats to typical designs Initial pipeline alignment Location classifications Current and future land use assessment Documented investigation of external threats Documented investigation of existing and planned buried and above-ground services Construction line list (construction and landowner constraints) Environmental line list (environmental constraints) Preliminary SAOP Isolation plan HAZOPs etc Fracture Control Plan Critical defect length / resistance to penetration Consequence modelling Environmental studies

36 Appendix H Study Integrity Key words Specific Explicit Effective Approve Key elements People Process Data, information and documents Chair

37 Wrap up

38 R1 - Rural Rural R1 Land which is unused, undeveloped or is used for rural activities such as grazing, agriculture and horticulture. Rural applies where the population is distributed in isolated dwellings. Rural includes areas of land with public infrastructure serving the rural use; roads, railways, canals, utility easements.

39 R2 - Rural Residential Land which is occupied by single residence blocks typically in the range 1 ha to 5 ha or is defined in a local land planning instrument as rural residential or its equivalent. Land used for other purposes but with similar population density shall be assigned Rural Residential location class. Rural Residential includes areas of land with public infrastructure serving the Rural Residential use; roads, railways, canals, utility easements.

40 T1 - Residential Land which is developed for community living. Residential applies where multiple dwellings exist in proximity to each other and dwellings are served by common public utilities. Residential includes areas of land with public infrastructure serving the residential use; roads, railways, recreational areas, camping grounds/caravan parks, suburban parks, small strip shopping centres. Residential land use may include isolated higher density areas provided they are not more than 10% of the land use. Land used for other purposes but with similar population density shall be assigned Residential location class.

41 T2 High Density Land which is developed for high density community use. High Density applies where multi storey development predominates or where large numbers of people congregate in the normal use of the area. High Density includes areas of public infrastructure serving the High Density Use; roads, railways, major sporting and cultural facilities and land use areas of major commercial developments; cities, town centres, shopping malls, hotels and motels

42 Sensitive Use (S) The Sensitive location class identifies land where the consequences of a failure may be increased because it is developed for use by sectors of the community who may be unable to protect themselves from the consequences of a pipeline failure. Sensitive uses are defined in some jurisdictions, but include schools, hospitals, aged care facilities and prisons. Sensitive location class shall be assigned to any portion of pipeline where there is a sensitive development within a measurement length. It shall also include locations of high environmental sensitivity The desing requirements for high density shall apply.

43 Basis of section Pipeline safety management shall be undertaken rigorously, shall apply controls to identified threats and shall reduce residual risk to an acceptable level All threats to the integrity of the pipeline shall be identified and multiple independent controls shall be applied to each identified threat Recognises hierarchy of effectiveness of controls Emphasis on controlling external interference threats Process for land use changes No rupture and maximum energy release rate in high consequence areas HAZOPs etc to be applied Two-stage process: 1) Design and Safety Review; 2) AS 4360 assessment of residual risks Suitably qualified, trained and experienced personnel The process and outcomes shall be documented and approved Ongoing process over life of the pipeline Predicated on ongoing application of operations and maintenance procedures via SAOP

44 Risk matrix CONSEQUENCES (people, environment, supply) FREQUENCY Catastrophic Major Severe Minor Trivial Frequent Extreme Extreme High Intermediate Low Occasional Extreme High Intermediate Low Low Unlikely High High Intermediate Low Negligible Remote High Intermediate Low Negligible Negligible Hypothetical Intermediate Low Negligible Negligible Negligible Consistency with general practice Provides same outcomes as original matrix Timing of action mandated for in-service pipelines (immediate action for extreme risk)

45 RISK MATRIX (2) People, environment and supply consequences to be analysed Description of consequence for each severity class to be reviewed and approved Frequency of consequence to be estimated Where multiple outcomes may result, highest risk ranking must be determined Risk treatment mandated by risk ranking

46 RISK TREATMENT ACTIONS Extreme Act to reduce to intermediate or lower Immediate action for in-service pipelines High Act to reduce to intermediate or lower Urgent action for in-service pipelines Intermediate Act to reduce low or negligible If not possible, demonstrate ALARP Prompt action for in-service pipelines Low Incorporate in management plan (ongoing monitoring) Accepted risk