pump for ferric sulphate
pump for ferric sulphate
(OP)
hi all!
I need to buy a small centrifugal pump for agressive liquid - ferric sulphate 40% solution, ph=1-2. q= 1-2m3/h, h=20m approximately.
manufacturer (Grundfos) offered a nice pump, 2850 rpm, casing & impeller in SS, shaft seal denoted as HQQV - silicon carbide single seal.
but, the manufacturer is concerned that for fluid concentrations greater than 20%, there will be cristalization on the shaft seal, resulting in shorter seal life. on the other side, fluid temperature is not mentioned which is strange - because ferric sulphate tends to form crystals in low temps. Ne seal flusning option is available.
because pump will be in operation ocassionaly, for a very short time periods, I am considering to buy a pump (client requests urgent action) and accept that I have to change seal more often.
any thoughts or sugestions?
I need to buy a small centrifugal pump for agressive liquid - ferric sulphate 40% solution, ph=1-2. q= 1-2m3/h, h=20m approximately.
manufacturer (Grundfos) offered a nice pump, 2850 rpm, casing & impeller in SS, shaft seal denoted as HQQV - silicon carbide single seal.
but, the manufacturer is concerned that for fluid concentrations greater than 20%, there will be cristalization on the shaft seal, resulting in shorter seal life. on the other side, fluid temperature is not mentioned which is strange - because ferric sulphate tends to form crystals in low temps. Ne seal flusning option is available.
because pump will be in operation ocassionaly, for a very short time periods, I am considering to buy a pump (client requests urgent action) and accept that I have to change seal more often.
any thoughts or sugestions?





RE: pump for ferric sulphate
RE: pump for ferric sulphate
RE: pump for ferric sulphate
martind@ab6.net
RE: pump for ferric sulphate
Regards checman
RE: pump for ferric sulphate
RE: pump for ferric sulphate
A steam or water quench are options... either way make sure to use a nice tight clearance floating throttle bushing to contain the quench in the seal and pipe the drain of the seal to an acceptable sewer or other collection device to keep housekeeping from being an issue. Make sure that the quench is always on, otherwise operators tend to forget to turn the appropriate valve before operating the pump.
JJPellin mentioned a kind of seal in another post called an Upstream Pumping (or Active Lift) seal that has also been used in caustic services. The idea is that an unpressurized process compatible fluid is pumped across the inboard seal faces much like a dry gas seal at a low rate into the seal chamber. This pumping action would keep the caustic from leaking into the buffer fluid and eliminate the crystallization problem. This has been available for some time now, I can think of at least three mechanical seal platforms that can be configured to use this.
If I remember correctly, John Crane presented this technology in a white paper at the Pump Symposium earler this year.