ANALISA KEGAGALAN

1. ANALISA KEGAGALAN S2 TMI – UB 2010/2011

2. Fault Tree Analysis • Failure Mode and Effect Analysis Metode Pengukuran Resiko

3. Probabilitas: peluang atau kemungkinan kemunculan satu kejadian. • Resiko: peluang kemunculan satu kejadian yang tidak diharapkan serta tingkat kritis dampak yang diakibatkan. • Pengukuran Resiko: proses kategorisasi resiko secara kualitatif atau estimasi resiko kuantitatif. • Manajemen Resiko : proses identifikasi resiko, pengukuran resiko, disposisi resiko serta monitor dan kontrol resiko. Definition

4. Reliability: The probability that an item will perform its intended function for a specified mission profile. • Safety: The freedom of injury, damage, or loss of resources. • Hazard: The condition that can result in or contribute to a mishap. • Mishap: An unintended event that can cause injuries, damage, or loss of resources. Definition

5. Failure or Fault Tree Analysis (FTA) merupakan pendekatan deduktif top-down yang merepresentasi hubungan antar kejadian secara grafis dan logik di mana status kejadian di level yang lebih rendah mempengaruhi status kejadian di level yang lebih tinggi • FTA menjadi alat sistematis untuk mendeskripsikan bagaimana interaksi antar elemen sistem yang mempengaruhi terjadinya kegagalan sistem. Fault Tree Analysis

6. Event Symbol

7. Gate Symbols

8. FTA Steps

15. Failure Mode & Effect Analysis (FMEA) merupakan metode analisis manual untuk menentukan konsekuen dari kegagalan komponen, modul atau subsistem • FMEA berwujud tabel spreadsheet yang mengidentifikasi macam kegagalan (failure mode), akibat kegagalan (failure effect), penyebab (possible causes), frekuensi kejadian (probability of occurrence), dampak kegagalan (severity) konsekuenconsequences, and proposed safeguards are noted. Failure Mode & Effect Analysis

16. 1. For each process input (start with high value inputs), determine the ways in which the input can go wrong (failure mode) • 2. For each failure mode, determine effects. Select a severity level for each effect • 3. Identify potential causes of each failure mode. Select an occurrence level for each cause • 4. List current controls for each cause. Select a detection level for each cause FMEA Steps

17. 5. Calculate the Risk Priority Number (RPN) • 6. Develop recommended actions, assign responsible persons, and take actions. Give priority to high RPNs. • 7. Assign the predicted severity, occurrence, and detection levels and compare RPNs FMEA Steps

18. The relationship between failure modes and effects is not always 1 to 1 Failure Modes and Effects Failure Mode 1 Effect 1 Failure Mode 2 Effect 2 Failure Mode 1 Effect 1 Failure Mode 2 Effect 1 Failure Mode 1 Effect 2

19. Severity • Importance of the effect on customer requirements • Often can’t do anything about this • Occurrence • Frequency with which a given cause occurs and creates failure modes • Detection • The ability of the current control scheme to detect or prevent a given cause Severity, Occurrence, and Detection

20. Severity • 1 = Not Severe, 10 = Very Severe • Occurrence • 1 = Not Likely, 10 = Very Likely • Detection • 1 = Likely to Detect, 10 = Not Likely to Detect Severity, Occurrence, and Detection

21. RPN is the product of the severity, occurrence, and detection scores. Risk Priority Number (RPN) Severity X Occurrence X Detection = RPN

22. Truck Stop Coffee Process Map Outputs Inputs Outputs Inputs Complete Order Customer Order Size Specification Hot Water Soap Scrubber Cleaned Carafe Dirty Water Wet Scrubber Receive Coffee Order Clean Carafe Clean Carafe Cold Water Measuring Mark Full Carafe Fill Carafe w/Water Complete Order Hot Coffee Cup Filled Cup Pour Coffee into Cup Filled Maker Empty Carafe Full Carafe Customer Reply Amount Specified Complete Order Pour Water into Maker Filled Cup Customer Cream Sugar Amount Desired Offer Cream & Sugar Filter Maker w/Filter Place Filter in Maker Maker w/Filter & Coffee Maker w/Filter Fresh Coffee Dosing Scoop Put Coffee in Filter Complete Order Money Make Change Temperature Taste Strength Complete Transaction Operating Maker Heat Brewed Coffee Maker w/Filter & Coffee Turn Maker On Say Thank You Smile Happy Customer Coffee Delivery Hot Coffee Brewing Coffee Select Temperature Setting

23. Truck Stop Coffee C&E Matrix

24. Step 1: For Each Input, Determine the Potential Failure Modes

25. Step 2: For Each Failure Mode, Identify Effects and Assign Severity

26. Step 3: Identify Potential Causes of Each Failure Mode and Assign Score

27. Step 4: List Current Controls for Each Cause and Assign Score

28. Step 5: Calculate RPNs

29. Step 6: Develop Recommended Actions, Assign Responsible Persons, and Take Actions

30. Step 7: Assign the Predicted Severity, Occurrence, and Detection Levels and Compare RPNs

31. Akhir Perkuliahan… … Ada Yang Ditanyakan