SEAL LEAK PATHS S019
In this illustration the lapped seal faces are being held together by multiple springs and the pressure of the fluid in the stuffing box.
- The O-ring located between the seal sleeve and the pump shaft is called the static O-ring. It is a potential leak path.
- The O-ring between the seal sleeve and the outside barrel is called the dynamic O-ring. It is a potential leak path also.
- In this example the rotating face has been press fit into the outer barrel of the seal. This face is usually a form of carbon/ graphite. There is a potential leak path between the carbon/ graphite and the outer barrel where the carbon has been inserted.
- The stationary face is normally the hard face and in this instance is a clamped “L” shaped design with gaskets on either side. The gasket located between the stationary face and the pump stuffing box is a potential leak path also.
- There is a potential leak path between the carbon rotating face and the stationary hard face.
- Although not shown in the illustration, many pump shafts are specified with a shaft sleeve for corrosion resistance or to position the impeller in a double ended design. This shaft sleeve must be sealed to the shaft by a gasket or some other means. This gasket is a leak path also.
There are a variety of other mechanical seals available with different potential leak paths. Check your design carefully.