Ce diaporama a bien été signalé.
Nous utilisons votre profil LinkedIn et vos données d’activité pour vous proposer des publicités personnalisées et pertinentes. Vous pouvez changer vos préférences de publicités à tout moment.

2012 Young Generation Network - Task analysis

832 vues

Publié le

Event organised by the IMechE and Nuclear Institute or recent graduates working in the power generation industry.
Introduction to task analysis.

Publié dans : Ingénierie
  • Login to see the comments

  • Soyez le premier à aimer ceci

2012 Young Generation Network - Task analysis

  1. 1. Tel: (+44) 01492 879813 Mob: (+44) 07984 284642 andy@abrisk.co.uk www.abrisk.co.uk 1 Task Analysis Using the Flow Loop Simulator Andy Brazier
  2. 2. 2 Overview Develop a method for performing a defined task (1 hour) Consider the potential for human error (30 minutes) Determine how you will communicate your task method to operators and prepare (1 hour) Operators carry out task (1 hour).
  3. 3. 3 Hierarchical Task Analysis A systematic way of describing task methods Ensures the task is properly understood Only includes details that are necessary Can be performed as a group exercise An excellent basis for: Analysing human performance issues Writing procedures Developing training and competence programs Design control rooms and interface
  4. 4. 4 Stages of the analysis Define the task title Define the task’s starting point as a set of preconditions Identify the first level of sub-tasks Should be less than 10 Identify which sub-tasks need further analysis Depends on criticality and/or complexity Again, less than 10 task steps for each break-down Continue adding detail where required
  5. 5. 5 Connect tanker to delivery point 5555555 Transfer fuel from road- tanker to storage Preconditions • Delivery from approved supplier • Tanker located in unloading bay Transfer fuel using tanker’s pump Disconnect tanker from delivery point Confirm tanker is OK to offload Connect earth to tanker Connect vapour recovery hose Connect delivery hose between tanker & delivery point Open valves Check for leaks Start tanker’s pump Standby & monitor throughout When complete, stop pump and close valves
  6. 6. Flow loop simulator 6
  7. 7. 7 Pump A Pump B Flow Control Tank (1m3) Reservoir Tank (1.5 m3) PI PI TI TT FL1/DA/003 FL1/DA/008 FL1/DA/011 FL1/DA/016 FL1/DA/018 FL1/DA/001 FL1/DA/055A FL1/DA/031A FL1/DA/055B FL1/DA/031B FL1/DA/042 FL1/DA/013 NRV FL1/DA/029A FL1/DA/026AFL1/DA/027A NRV FL1/DA/029B FL1/DA/026BFL1/DA/027B PRV FL1/DA/R038 PRV FL1/DA/R039 FL1/DA/024 Return to reservoir tank FL1/DA/TW01 Liquid Supply M Manual valve Motor operated valve Non-return valve Relief valve PI Pressure indicator PI FL1/DA/054
  8. 8. Simplified flow 8 Pump A Pump B Flow Control Tank (1m3) Reservoir Tank (1.5 m3)
  9. 9. 9
  10. 10. Group 1 – Start circulation 10 Pump A Reservoir Tank (1.5 m3)
  11. 11. Group 2 – Change circulation 11 Pump B Flow Control Tank (1m3) Reservoir Tank (1.5 m3)
  12. 12. Group 3 – Fill flow control tank to maximum level then shutdown 12 Pump B Flow Control Tank (1m3) Reservoir Tank (1.5 m3)
  13. 13. Controls and Instruments 13 M Manual valve Motor operated valve PI Pressure indicator Non-return valve Relief valve You will need to use these to complete your task No need to touch these These may give some useful information in completing the task
  14. 14. Terminology 14 Pump A Inlet Outlet PI Isolation valve
  15. 15. Key Requirements Flow control tank must not go above its maximum level at any time Whenever a pump is running Reservoir Tank level between minimum and maximum Pump inlet and outlet valves opens Reservoir Tank outlet and loop valves open Valve to either Reservoir or Flow tank open 15
  16. 16. Your task analysis Basic structure Check it is OK to proceed Set up the loop as required Confirm everything is OK Valve references Don’t just use Tag numbers Refer to valve list and include description and Tag number 16
  17. 17. Human Error Analysis A systematic way of identifying potential human errors Making sure all credible errors are considered Recording the possible consequences Evaluating exiting risk control measures and opportunities for further reduction Simple and effective method of tackling an issue that is often considered to be complex and problematic. 17
  18. 18. First – Convert task analysis to tabular 18 1. Confirm tanker is OK to offload 2. Connect tanker to delivery point 2.1 Connect earth to tanker 2.2 Connect delivery hose between tanker & delivery point 2.3 Connect vapour recovery hose 3. Transfer fuel using tanker’s pump 3.1 Open valves 3.2 Start tanker’s pump
  19. 19. Consider consequence for each step if Omitted (not carried out) Incomplete Performed on the wrong object Mistimed (too early or late) Carried out at the wrong speed (too fast or slow) Carried out for the wrong duration (too long or too short) Performed in the wrong direction. 19
  20. 20. 20202020 Task Step Possible error Existing risk control measures Consequence Additional measures 20 Connect earth to tanker Action omitted - Potential for static discharge to act as source of ignition Failure to achieve an earth before starting transfer. Standard practice for all tanker operations. Consider installing interlocked earth connection.Earth connection readily available.
  21. 21. 212121212121 Task Step Possible error Existing risk control measures Consequence Additional measures 21 Dis- connect tanker from delivery point Action omitted or incomplete - Damage to hoses, plant or tanker. Not properly disconnected Driver responsibility Error unlikely None. Action too early - Disconnect hose whilst transferring Release of material being transferred. Noise will alert operator to fact transfer is ongoing. None.
  22. 22. How will you communicate your task? Procedure Simple and logical Presented in an easy to follow format Emphasise hazards and critical steps Training Task objectives Hazards Critical steps Do they understand? 22
  23. 23. Human performance and error avoidance tools Recognise where errors can occur and adopt tools to minimise likelihood Pre-job brief STAR (Stop, Think, Act, Review) Self checking Peer checking Procedure use, adherence and place-keeping Questioning attitude Clear communication. 23
  24. 24. What you need to do now Convert your task analysis to tabular format Complete human error analysis for the most critical steps Develop a plan to communicate your task method to operators from another group. 24
  25. 25. Practicalities PPE 25
  26. 26. Practicalities 26
  27. 27. Valves 27
  28. 28. 28 Open Closed
  29. 29. 29 Open Closed
  30. 30. 30

×