Failure of Valves
Failure of Valves
(OP)
I have installed SS 316 Ball Valve at the entry of Filter Press & at the end of recirculation line. The pipeline is having pressure of about 4 Kg/cm2. It is used for Cu Slurry solution with density of 1.5. After Valve there is a bend to redirect the solution of recirculation line in the Vessel / reactor. The difficulty is that the frequency of Valve failure and that bend is too much in recirculation line. Can any one suggest ? Is there any problem with the layout ? All MOC of pipeline are SS 316, Sch#40 and Pump is Warman Slurry pump 4/3 CCAH.





RE: Failure of Valves
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RE: Failure of Valves
Pls find herewith attached file of layout for your reference.
RE: Failure of Valves
RE: Failure of Valves
RE: Failure of Valves
RE: Failure of Valves
Are you seeing valve stems breaking, valves seat materials eroding away but the balls themselves are okay, or are you seeing erosion on the ball material itself, etc.
What is the physical problem or symptom that you experience that tells you the valve has failed. Have you taken any of the valves out and examined the internals to see exactly what is going on ?
RE: Failure of Valves
We have inspected valves also. It is observed that 3" SS valve,which got damaged within two days after fixing in the recirculation line of Warman pump. The same kind of damage observed in PP valves also earlier. The teflon ring is the same as in SS & PP valves which once damaged, erodes the SS part very fast with the velocity of the slurry. We have checked the pressure is around 4 kgs/cm2 in the discharge line of the pump.
WE also have installed Pinch Valve but it's Sleeve is rupturing even in fully closed condition.
RE: Failure of Valves
SS material is also quite soft (as is teflon) and you might want to try and harden the valves against erosion.
SEATS: If you are having trouble with the teflon, can you find harder more resistant elastomers (perhaps PEEK) or could you consider a metal seated ball valve.
BALL: If you are currently using just bare SS, you could consider providing a hard wear resistant coating on the valve. Consult the manufacturers but options might include nitriding or electroless nickel coating. A heat treated low phosphorous electroless nickel coating would provide good wear resistance.
RE: Failure of Valves
RE: Failure of Valves
micalbrch : Sir, this is on-off application. For Throttling the flow we are using CS Diapharm valve rubber coated which works satisfactorily. Thanks for your reply
RE: Failure of Valves
RE: Failure of Valves
Dear Sir,
I think we have never thought regarding pumping into filter press without valve. But the obstruction is we have comman pump for two filter presses. One running and other standby.
please suggest.
Idea seems to be good but cant able to found suitable layout
RE: Failure of Valves