TAILIEUCHUNG - The Risk Management of Safety and Dependability_6

Tham khảo tài liệu 'the risk management of safety and dependability_6', kinh doanh - tiếp thị, quản trị kinh doanh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Methods and procedures for evaluating risk 137 Basic event symbol Development of events leading to a fire. Third-level events switchgear fails or pressure control fails. Fourth-level events manual control fails and auto-pressure control fails and high-pressure alarm shutdown fails. Manual control fails because operator fails or pressure gauge fails or push button fails. The drawing for the fault tree is shown in Fig. and has been constructed to avoid a common mode failure. To demonstrate common mode failure it can also be constructed as follows Second-level events pressure relief valve fails basic event and pressure control fails. Third-level events manual control fails or auto-pressure control fails or high-pressure alarm shutdown fails. Manual control fails because operator fails or pressure gauge fails or push button fails or switchgear fails. Auto-pressure control fails because auto-pressure control fails or switchgear fails. PAHH fails because high-pressure alarm shutdown fails or switchgear fails. Woodhead Publishing Limited 2010 138 The risk management of safety and dependability Here the same switchgear appears in three places this is called a common mode failure. If not corrected it will result in the failure of the switchgear being accounted for too many times. An evaluation of the pressure control system fault tree in Fig. shows Manual control system probable failure Automatic control system probable failure Pressure control system probable failure Compressor shutdown probable failure Probable explosion P1 A B C P2 E X F P3 Pi X P2 P4 P3 D P5 P4 X G Operator Pressure gauge Push button Auto-control PAHH shutdown FTA air pressure control system. Woodhead Publishing Limited 2010 Methods and procedures for evaluating risk 139 Table Quantitative risk of an explosion Item Symbol Gate P Evaluation Operator A or Pressure gauge B or P1 A B C Push button C or P1 350 33 Manual control P1 Auto-pressure control E

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