How do seal flushing schemes 52 and 53 differ?
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According to API682 standards, how are seal flushing schemes 52 and 53 distinguished from each other? What’s the difference between 52 and 23? Finally, how can one determine whether it is a single-unit seal or a series-connected seal based on the flushing scheme?
The mechanical seal fluid reservoir of model 52 is pressure-free, while that of model 53 is under pressure; it is mainly necessary to check whether there is a pressure source on the mechanical seal fluid reservoir. 52, although there is no pressure source, will be connected to the collection system. In API682, the flushing schemes specify that 5x configurations use double seals, 7x uses dry gas seals, 6x uses auxiliary seals, while the others use single seals. Series connection is a type of dual-machine seal; it seems impossible to determine it based solely on the flushing scheme.
52 has no back pressure, while 53 has an accumulator that provides back pressure for the seal