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@Tugboateng We suspected the check valve before and tried running the pump without it and nothing changed. @Littleinch The fluid is thickened sludge with 4-6% solid concentration, when settled in a pipe it becomes thick and looks like mud or ketchup. After trying many solutions I think that...

&Tugboateng I just noticed your comment, the source tank is always full and we tried injecting water to the suction and it didn’t help.

i will keep trying this procedure and hopefully we will find a conclusion. Thank you for your responses and support.

The valve we are taking about is a gate valve that takes about 5-10 sec to be fully opened, do you think we need to take more time ? I think the velocity in our case is 1.5ft/sec, do you think this could be our problem specially that if one of the pumps was in good performance the other one...

We managed to try running the pump while closing the discharge valve for and then slowly opening it. The results were good for 2 out of 3 tries. The 2” pipe connected to the suction is a pressurized water line that we installed previously when we thought that the problem is with sludge clogging...

Bimr No the existing pumps are not having any issues but they are connected to the holding tanks (the short path). The reducers installed are eccentric type with flat side on top (we installed it upside down at first but we fixed it after noticing a cavitation sounds) now both pumps sound is...

Tugboateng A recirculation line back to the tank will be very difficult to install. Can we just connect it to the suction line instead ? What i understood from your comments is that the pump during priming is not achieving the required head to push all fluid and therefore reducing the head by...

@Tugboateng Thank you for your reply. Could you please explain how fluid can be trapped in pipes ? Just outside our room we have a downward elbow (L shape) 0.5m height. Could this be the are were fluid trapped and why the Pump doesn’t push it ? Also, could you please explain the recirculation...

Attached is a drawing of the piping inside the pumps room, the discharged line (where GV1 & GV2 are installed) is 2.25m above the suction line level. Thickener tank level is 2.5 m above pump’s suction. The desired path is go drying beds through GV1 and the valve that we open for a minute is GV2...

Hello We have recently installed a centrifugal pump with screw open type impeller (curve attached) to deliver waste water (sludge) from thickener to drying beds (around 300m distance), and we are unfortunately facing confusing problem since the first start. The best way to describe the problem...