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Extra info for DOE Handbook Chemical process hazards analysis
The study generates narratives about the normal operating conditions and analysis boundary conditions for each equipment item. In addition, it provides a list of potential actions that should be evaluated. 16 is an example of a HAZOP study worksheet. A typical HAZOP study report should include a brief system description, a list of drawings or equipment analyzed, the design intents, the HAZOP study tables, and a list of actions items. 16. 17. Time Estimates for Using the HAZOP Study Method (a) (b) SCOPE PREPARATION (a) EVALUATION DOCUMENTATION Simple/Small System 8 to 12 hours 1 to 3 days 2 to 6 days(b) Complex/Large Process 2 to 4 days 1 to 4 weeks 2 to 6 weeks Primarily team leader and scribe, although others may work during this phase.
Pressure reducing valve fails closed. 51 __ of __ ACTION Tower basin water level indication. Less No chlorine flow to tower basin. Low chlorine concentration in tower basin. P AGE: Local pressure indication on chlorine injection line. Local flow indication on chlorine injection line (rotameter). 6 Note: Pump normally runs at full speed. 1 Description of the Method A FMEA is used to examine each potential failure mode of a process to determine the effects of the failure on the system. A failure mode is the symptom, condition, or fashion in which hardware fails.
This closer examination can take the form of field inspections, examination of historical records, operator interviews, material testing, consequence modeling, and/or the use of more rigorous analysis methods, such as quantitative FTA. 3 Presentation of Results The critical results of a PrHA are a list of action items. Action items are written by the PrHA team any time additional effort is warranted to further analyze a specific accident scenario, eliminate the hazard, or reduce risks. Action items are not usually specific corrective actions.