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Mechanical Seal barrier fluid is the media used for the flushing of mechanical seal faces. The heat generated (because of physical contact and friction) between a pair of mechanical seal (Normally one face rotary whereas the the is stationary) faces is being carried away by the barrier fluid which is being recirculated after proper cooling.
The barrier fluid also create a barrier between the process fluid and flushing fluid. It is being kept at a higher pressure than process fluid in order to always ensure that only barrier fluid film remain across the seal faces all the time.
The barrier fluid is being kept in a container with connected piping from mechanical seal inlet and outlet. There is normally a cooling device (Air cooler or conventional water cooler) in between for cooling the seal outlet barrier fluid.
Liquids being used as a barrier fluid in cases of liquid sealing. Where as gases being used a barrier in case of gas sealing.
The barrier fluids are being recommended considering the various check points being given as a guide line in API 682 3rd edition. ( See the details in the subject API plan 53 & 74 barrier fluid selection).
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