Seeking advice: Should the bottom of the static ring in a mechanical seal come into contact with the bottom of the flange cover?
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A horizontal multi-stage centrifugal pump was installed in the power plant for handling diesel as the fluid. As a result, there was slight oil leakage at the flange hole on the outlet side. There is no leakage at rest, and no leakage either when the crank is turned manually. After starting the vehicle, a lot of oil mist flew out from the flange holes. Outlet pressure 3 Mpa. It doesn’t leak even at a pressure of 1.5 MPa; the specific pressure has been set quite high. The O-rings at each point are also not loose. There’s only one point I don’t understand: the bottom of the stationary ring is in contact with the flange of the stationary ring. Should there not be a small gap to allow some flexibility for the stationary ring? I would appreciate your advice; thank you all!
Is there a positioning pin? If there is one, it’s possible that the static ring gasket isn’t pressed tightly enough. You didn’t explain it very clearly; it’s better to use images
According to the assembly requirements, complete contact is necessary; what you said wasn’t very clear
That is, at the bottom of the static ring and its seat, should there be a gap or should they be in direct contact?
This post was last edited by Rain in late autumn on 2017-11-26 at 10:52 with additional images
There are no gaps now, but I suspect that because the bottom parts are in direct contact with each other, there are no gaps, which results in the O-ring not being compressed tightly in the axial direction; only radial compression occurs, and this is not sufficient to withstand the pressure of the medium I’ve taken it apart twice already; I’m exhausted. It doesn’t leak at 1.5 Mpa, but leaks at 3 Mpa.
What does that mean?: dizzy:
There is a positioning pin, which is 1-2 mm away from the anti-rotation hole in the stationary ring, so it cannot reach it.