HPCL CPM 3-PCP 5-Risk Anaylsis & Hazop Studies- PPT.pptx

Occurrence which rates the likelihood that the

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Occurrence , which rates the likelihood that the failure will occur. Detection , which rates the likelihood that the problem will be detected before it reaches the end- user/customer
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Case Study - FMEA Component – High level switch, ROV, SC Valve , O ring , Regulator Function Detection of defective state Failure Modes- In what ways can the step go wrong? Failure Cause - What causes the step to go wrong? (i.e., How could the failure mode occur?) Failure Effect - What is the impact if the failure mode is not prevented or corrected? RPN - Severity( 1-10) , Occurrence(1-10) , Detection (1-10) Detection methods- Existing Controls -What are the existing controls that either prevent the failure mode from occurring or detect it should it occur? Action Recommended -What are the actions for reducing the occurrence of the cause or for improving its detection Who is responsible - Who is responsible for the recommended action? What date should it be completed by? Action Taken -What were the actions implemented? Include completion month/year (then recalculate resulting RPN).
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FMEA Rating Scale Detection rating Description Example 1-2 ( Very High ) Current controls almost certain to detect the failure mode 3-4 (High) Controls have a good chance 5-6 (Moderate) Controls may detect 7-8 (Low) Controls have a poor chance 9-10(Very low) Controls probably Will not detect the existence of failure mode
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Occurrence , Severity , and Detection Ratings Occurrence Rating Description Example 5 Very high, almost certain to occur repeatedly 4 High. Very likely to occur 3 Moderate. Somewhat likely to occur occasionally 2 Low. Would occur under rare circumstances 1 Remote. Unlikely that failure would occur
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Occurrence , Severity , and Detection Ratings Severity Rating Description Example 5 Very high, Potential for great harm or death. Equipment destruction 4 High. Harm would require medical treatment. Substantial equipment damage 3 Moderate. Pain or discomfort. Some equipment or subsystem damage 2 Low .some annoyance. No noticeable performance change. 1 Negligible. End user would probably not notice
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Unit 5 HAZOP & Operability Studies Unit 5 HAZOP & Operability Studies
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Hazard & Operability Study – Introduction & Concept The origin of HAZOP studies were in ICI ( Imperial Chemical Industries , UK ) in 1960s. It grew between 1960s – 1980s when there was great deal of application of critical examination being explored world wide. `The procedure is very effective in identifying hazards . The basic IDEA is “ let the mind go free “ in a controlled fashion .The full Hazop study is completed by a committee composed of cross section of people who have experience in individual fields. For Process Industry Hazop Study is very popular and may be described as Jewel Of the Crown
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Hazop Study – Principles Take full description of the process under study – storage , pipeline , loading, unloading gantry, cylinder filling , etc Understand design intent in-depth Question every part of the process – what can go wrong
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  • Fall '19
  • Safety engineering, fault tree, Hazards

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