Mechanical seal face failure analysis pdf

A mechanical seal will normally be a component part of a pump, compressor or other system component at a higher indenture level. 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. Diagnosing common causes of sealing failures peerless pump. For a more accurate analysis, make reference to api 682 specifications. Seal faces can be lubricated by the process fluid or, with double mechanical seals, by a. Cracked seal face thermal shock mechanical shock or impact avoid uneven or over tightening of fasteners maintain consistent flush to seal. Therefore, all seals will fail it is simply a matter of time. Failure analysis john crane wear fatigue material scribd. A case study of a fire caused by seal failure on a butane pump equipped with a cartridge type double. Table of contents vii chapter eight seal face mechanical loading devices, 71 8. On the damaged shaft seal, it is possible to observe what. Root cause on seal failure in refinery by sourav kumar chatterjee sr. Failure of mechanical shaft seals the knowledge link. Allowing the pump to run dry allowing your pump to run dry can be very damaging to a mechanical seal.

Mechanical seal failure logic diagraph is prepared for failure modes of mechanical. Here are 6 of the most common reasons mechanical seals can fail. The primary seal faces are cooled by recycling the pumped fluid, while the. Skills in mechanical seal failure analysis can be improved by looking at the basic forms of damage that occur to determine. Some factors that did not seem to have contributed to earlier failures were not examined or.

Other times, failure is a result of poor selection or installation errors. The first step in a sealfailure analysis is to determine what, exactly. Problems at the faces carbons, ceramic, silicon and tungsten carbide faces wear heat. Under the right conditions, mechanical seals can experience thermal shock and shatter within 30 seconds. Seals are often identified as the problem rather than the symptom of another problem. Click here for full pdf version of this article includes all graphs, charts, tables and author. Therefore, the failure mode at the higher component level may refer to the seal. 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. Detailed information is required to make a failure analysis of a damaged shaft seal and subsequently prevent new failures. Manager reliability improvement hpcl mumbai refinery mumbai, india many different factors contribute towards the failure of a pump. The seal ring which rotates with the shaft is called the rotary ring. The first measure in seal failure analysis is to identify the ba sic seal components that show damage that. Pdf unique failure mode for double mechanical seals api seal. Failure analysis john crane free download as pdf file.