How dry gas seal works in a Cenrifugal compressor?

Posted by 25 January, 2011

Question by Ravi: How dry gas seal works in a Cenrifugal compressor?
Mechanical seal and dry gas seal working principle

Best answer:

Answer by pboltonchina
Try this site http://www.howstuffworks.com it may help

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One Response to “How dry gas seal works in a Cenrifugal compressor?”
  • hpfgirl says:

    Mechanical seals have two faces, usually a hard and a soft material that are within 2 lightbands of flatness on the surface where they meet. One face is fastened to the shaft (rotating) and one face is stationary. The two faces rub against eachother with very thin fluid film between them. One of the faces is spring loaded so that they will stay together even when the pump is not pressurized. Under normal operation, hydraulic forces hold the faces together.

    Dry gas seals are essentially the same as mechanical seals used in pumps. The main difference is the hard face usually has an etched design that provides “lift-off” capability. When the compressor is running at the minimum speed the faces won’t actually touch, so they can run dry. In most cases, you will have two sets of faces, between which you would supply a buffer gas. This prevents process gas from reaching the atmosphere.

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