Seal Faces and Scale
Seal Faces and Scale
(OP)
Hey Group
If you are sealing a fluid with a quantity of disolved solids and the Calcium Carbonate has a tendancy to scale, would you expect scale to form on the actual sliding area of the seal faces
OR
Is hang up more of concern when it comes to scaling?
TIA
If you are sealing a fluid with a quantity of disolved solids and the Calcium Carbonate has a tendancy to scale, would you expect scale to form on the actual sliding area of the seal faces
OR
Is hang up more of concern when it comes to scaling?
TIA
-
Milkboy





RE: Seal Faces and Scale
Contact a/the seal manufacturer for more specific advice.
RE: Seal Faces and Scale
Typical hot service high speed mechanical seal has liquid film that is partially vaporizing on faces. As the liquid film progresses from inside to outside, there will be partial vapor film formed. Solids are left from the vaporized film.
A hard face seal is recommended for fluids with dissolved solids or slurries. Tungsten carbide or silicon carbide are two choices for seal faces. Alumina ceramic could be suitable for moderate corrosive fluid or soft crystal solid.
RE: Seal Faces and Scale
-
Milkboy
RE: Seal Faces and Scale
I have not had success with two hard faces and calcium deposits. I have had success with a soft face / hard face combo, usually SiC / C.
I have also used a double seal with a clean water barrier fluid. This cools the faces of the first seal and reduces calcium precipitation.
RE: Seal Faces and Scale
Temp is 68 to 86 deg F
I was hoping use C v SiC as I guess this would run cooler as the C had good lube properties, and there is a chance of dry running / partial dry running at start up.
(Double seals are out as there are no utilities or $ left!)
@ClicketyClack > What have you seen with 2 hard faces and calcium with regard to failure mode?
How did the C / SiC improve your app? No face scaling?
What ppm of Calcium did you have?
TIA
-
Milkboy
RE: Seal Faces and Scale
As far as the budget is concerned, it's cheaper to buy one double seal a year with a seal pot than four single seals a year. The double seal is especially useful if there is a chance of dry run. What size shaft do you have?
RE: Seal Faces and Scale
Would you then say this is not the case with CaCo3 scale?
Is calcium cabonate scale or similar therefore softer than C faces?
Shaft is 4" !
I take onboard your point about double but I know there wont be a change.
Thnks
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Milkboy