Alfa Laval S846 HFO Separator problem

[Mirceaa]

Hello Fede,

Experienced Pt5 issues in the past, in my case, while opening the purifier for inspection we found a loose screw on the parring tube assembly, the arm to which the spring is attached is secured with an strew, that screw was loose so the arm/ spring assembly was not moving properly the paring tube. Screw retightened, purifier restarted Pt5 steady, no more alarms.

[Arnav]

In main engine Lube oil purifier 821 bowl opened for bowl cleaning after that "no pt4 feedback pressure during ti59" Alarm coming. After that i started purifier without caliberation it is running ok parameters are (pt1- 0.33,pt4- 1.3,pt5- 1.2).
After every 3rd day "no pt4 discharge feedback pressure during ti59" coming.

I changed solenoid of sv10, new filter put before water valve block, flow valve of sv10 changed, parameter fa6- 0 done but still alarm coming.

[Arnav]

"No transducer response "alarm I cleaned Mt 50 transducer, but still alarm comes, purifier don't stop when alarm comes

[popeye62]

Hello Arnav. The alarm is telling you that the bowl is not filled or there is no pressure feedback. I don't believe that changing the settings is the answer unless they have been changed previously. How did you start the sequence without calibration, did you put Ti59 to 0 seconds? I would start by putting the settings back to where they were. In my manual I have: Ti59 - 170 seconds and Fa6 - 0.2b. Check all the other settings especially the factory settings (Fa) I would also increase the back pressure at PT4 to nearer 2.0b by closing in the regulating valve RV4 (the alarm range is 1.0 to 3.0b). I hear you, regarding the work done on the water supply but both alarms; the lack of feedback pressure and the lack of response from MT50 are both pointing to SV10. Why it would run for three days and then fail - I don't know. Even if there was a slow leak from the bowl or through V5 it should be made up during the separation sequence or after an ejection. Look again at SV10 and physically check the flow rate/quantity. Good luck, John.