Boiler Feed Pump
Boiler Feed Pump
(OP)
Hey there Group
In boiler feed apps the metal of the mech seal often
get a red/brown coating on it.
Is this Ferrite?
Im looking for info on the source of the ferrite in these apps and how it can be dealt with (mag filters? and the like)
Is the ferrite suspended in the water or is it dissolved in and precipitates out and 'scales' onto metal work
Any advice / info or URLs appreciated
TIA
M
In boiler feed apps the metal of the mech seal often
get a red/brown coating on it.
Is this Ferrite?
Im looking for info on the source of the ferrite in these apps and how it can be dealt with (mag filters? and the like)
Is the ferrite suspended in the water or is it dissolved in and precipitates out and 'scales' onto metal work
Any advice / info or URLs appreciated
TIA
M
-
Milkboy





RE: Boiler Feed Pump
Johnny Pellin
RE: Boiler Feed Pump
No. It is probably iron hydroxide in the form of rust. There is iron transport going on (corrosion) in the boiler waterwall circuit and it should be investigated.
RE: Boiler Feed Pump
RE: Boiler Feed Pump
Probable cause is high oxygen and maybe also low pH. Look for a Pourbaix diagram for iron-water in a corrosion or water treatment book. You want to maintain conditions where an Fe+2-containing phase (Fe(OH)2 or Fe3O4) is stable in contact with Fe.
h
ht
There are too many variables to show everything on a single diagram for a given temperature, so you will find one type with the oxides given and another with hydroxides:
"The orange zone indicates where one could expect to see rust" -- (from corrosion-doctors link)
Marcel Pourbaix, the electrochemist/corrosion engineer & scientist: http: