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FPST 4333 System & Process Safety Analysis
Assginment-6 FMEA
Read Chapter 16 in the Ericson Textbook and Mil Std 1629A (in Canvas). Answer the following questions using appropriate technical, professional language. Identify the document and page number(s) where you found the answer in the texts. Questions that ask to describe or explain must written in your own words. Points will be deducted for passages copied directly from the text. Diagrams must be developed using electronic or engineering drafting methods. Hand sketches or sloppy drawings will not be considered. Delete this box for your final homework submission. Submit this file to the Canvas Assignment with the filename HW8yourlastname.doc.
Compare/Contrast the definitions of the following terms between the Ericson textbook Ch 16 and Mil Std 1629A:
1. Failure Mode
2. Failure Cause
3. Immediate Effect
4. System Effect
5. Method of Detection
6. Consider the figure below showing two identical pumps,
• For each pump, there have been 20 failures in 10 years.
• On average, when a pump breakdown occurs, the other pump is put on-line. When a pump fails, it will be out of service for 5 days for repair.
Estimate the frequency that both pumps will be out of service at the same time, because the operating pump has failed before the backup pump has been repaired?
7. Consider the Diammonium Phosphate (DAP) process flow diagram shown below:
Diammonium phosphate (DAP) is produced from continuous flow of phosphoric acid (PA) and ammonia (A) solutions in a mixing tank and is represented by the balanced chemical reaction
PA+A → DAP
If Ammonia and Phosphoric Acid flow rates increase, the energy release rate will accelerate. If too much Phosphoric Acid is fed to the reactor, there will be degraded product but no major reaction hazards. If too much Ammonia is fed to the reactor, unreacted Ammonia may enter the DAP storage tank and residual (toxic) Ammonia will be released into the work area.
Prepare an FMEA table for the failure of Valve A on the ammonia solution line.