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  Indian J Med Microbiol
 

Figure 1: Mechanical seal failure logic digraph. Events: 1. Dummy, 2. Problem of abrasive contaminants, 3. Improper seal material, 4. Problem of maintaining PV value, 5. Excessive fluid pressure, 6. Improper seal design, 7. Problem of misalignment, 8. Improper seal assembly and installation, 9. Insufficient seal lubrication, 10. Excessive face temperature, 11. Failure of secondary seals, 12. Improper seal maintenance practices, 13. Mechanical seal failure

Figure 1: Mechanical seal failure logic digraph. Events: 1. Dummy, 2. Problem of abrasive contaminants, 3. Improper seal material, 4. Problem of maintaining PV value, 5. Excessive fluid pressure, 6. Improper seal design, 7. Problem of misalignment, 8. Improper seal assembly and installation, 9. Insufficient seal lubrication, 10. Excessive face temperature, 11. Failure of secondary seals, 12. Improper seal maintenance practices, 13. Mechanical seal failure