Mechanical seal face failure analysis pdf

Diagnosing common causes of sealing failures peerless pump. Table of contents vii chapter eight seal face mechanical loading devices, 71 8. Failure analysis john crane wear fatigue material scribd. Click here for full pdf version of this article includes all graphs, charts, tables and author. The seal ring which rotates with the shaft is called the rotary ring. On the damaged shaft seal, it is possible to observe what.

Here are 6 of the most common reasons mechanical seals can fail. The first step in a sealfailure analysis is to determine what, exactly. The failure mode of mechanical seals and the various cause events to help in taking appropriate steps to improve sealing reliability are discussed by singh et al. Mechanical shaft seals with hardhard seal face material pairings usually experience problems associated with dry running. Under the right conditions, mechanical seals can experience thermal shock and shatter within 30 seconds. A mechanical seal will normally be a component part of a pump, compressor or other system component at a higher indenture level. Therefore, the failure mode at the higher component level may refer to the seal. The first measure in seal failure analysis is to identify the ba sic seal components that show damage that. Some factors that did not seem to have contributed to earlier failures were not examined or. Failure analysis john crane free download as pdf file. Problems at the faces carbons, ceramic, silicon and tungsten carbide faces wear heat. Failure of mechanical shaft seals the knowledge link. Root cause on seal failure in refinery by sourav kumar chatterjee sr. For a more accurate analysis, make reference to api 682 specifications.

Since the purpose of a mechanical seal is to prevent, or at least limit, leakage, most users consider the seal to have failed when excessive leakage occurs. Manager reliability improvement hpcl mumbai refinery mumbai, india many different factors contribute towards the failure of a pump. A case study of a fire caused by seal failure on a butane pump equipped with a cartridge type double. Other times, failure is a result of poor selection or installation errors. Allowing the pump to run dry allowing your pump to run dry can be very damaging to a mechanical seal. Seals are often identified as the problem rather than the symptom of another problem. Skills in mechanical seal failure analysis can be improved by looking at the basic forms of damage that occur to determine. Pdf unique failure mode for double mechanical seals api seal. Seal faces can be lubricated by the process fluid or, with double mechanical seals, by a.