Wear ring in centrifugal pump
Wear ring in centrifugal pump
(OP)
Hello.
I have a question. Maybe is seems be a easy but I don't now what is the best solution in centrifugal pumps in wear ring.
Generally when we need use a serrated seal it is on the rotation part (on impeller). Once i saw a casing wear ring with serrate, and I have a doubt that it is a good solution.
Is it possible that serrate on stationary part of pump, (on stationary wear ring) can cause a pressure pulsation.
On the top of ring in gaps can appear a vapour or air?
THX for answer, and sorry for my english
I have a question. Maybe is seems be a easy but I don't now what is the best solution in centrifugal pumps in wear ring.
Generally when we need use a serrated seal it is on the rotation part (on impeller). Once i saw a casing wear ring with serrate, and I have a doubt that it is a good solution.
Is it possible that serrate on stationary part of pump, (on stationary wear ring) can cause a pressure pulsation.
On the top of ring in gaps can appear a vapour or air?
THX for answer, and sorry for my english





RE: Wear ring in centrifugal pump
RE: Wear ring in centrifugal pump
Johnny Pellin
RE: Wear ring in centrifugal pump
There are some papers that claim very shallow grooves will perform almost identically to smooth rings from a rotor stability standpoint, but give the benefits of reduced leakage rates.
I've never seen a wear ring cause pressure pulsations and I'm not sure how they could. Since the pressure drop across a wear ring is constant regardless of the geometry, what matters in vapor formation is the low pressure side fluid vapor pressure. Certainly in the case of a say a LNG service if your vapor pressure margin is too low you can get flashing, but that is a problem of correct pump selection for the conditions, not the wear ring design.