Improving the Reliability of Mechanical Seals （提高机械密封的可靠性）.pdfVIP

Operations Maintenance Improving the Reliability of Mechanical Seals With a better understanding of seals, Michael Huebner Flowserve Corp. their selection, material considerations and operation requirements, users can greatly improve equipment reliability and reduce operating costs. echanical seals provide an important contribution By far the most challenging aspects of seal selection are to the operation of many different industries. due to the nature of the fluids themselves. Almost every MThese ubiquitous devices are found in centrifugal fluid in a refinery is a good lubricant. Very few fluids in pumps, reactors, mixers, blowers, compressors and some chemical plants share this property. Process fluids can positive-displacement pumps. Despite their widespread use polymerize on the seal components or crystallize on expo- though, they are often given little consideration. With a sure to the atmosphere. There may be wide swings in fluid better understanding of seals, their selection, material con- properties during a batch or between processes. The seal siderations, and operational requirements, users can greatly and system must be designed to tolerate all of these. improve equipment reliability and reduce operating costs. Many chemical processes require variable operating con- Pump selection and operating requirements ditions or batch processing. Fluctuations in pressure or tem- It is impossible to define a comprehensive list of fac- perature, the addition or creation of intermediate com- tors that could cause a mechanical seal to fail due to the