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Hi guys, When pumping 3% to 6% primary sludge with a plunger pump ( in this case an EMS VRH250 Hydraulic 240-500 lpm, 0-50 bar ) is it necessary to still consider scour velocity. We have 8 pump sets operating duty standby desludging 8 primary settlement tanks. We are having problems with...

Sorry Guys, forgot to tell you that we did check the rotation and it is ok. The reason the impeller jammed could also be that maybe the the mixers were fitted in the wrong volutes. I doubt whether they were marked up on removal from site. Am i way off the mark thinking the clearances can have...

Hi Guys, We have a couple of horizontally mounted Hidrostal mixer pumps on a thickened sludge storage tank. The motor, coupling assembly with the impeller were recently withdrawn from the volute and sent away for repair. ( At present, all i know is that they had been probelmatic for some time...

Guys, final update. Once the hopper was cleaned out thoroughly and the pump replaced, it pumped perfectly well removing grit. However the root cause of the grit removal system was found to be a faulty simocode unit in the control panel. The open / closed signals from an automated wash water...

Cant explain that Artisi, other than i didnt see it with my own eyes. Ops did the initial cleaning of the hopper and said it had been fully cleaned when it hadnt. They also told me about the poor flow when it had been lifted and run while only just submerged. I dont know the level of submersion...

Guys, Emptied the grit trap yesterday to find the bottom of the hopper to be completely full of compacted grit plus other and pieces, a drain rod amongst other things. While the pump was out we checked the impeller, the key was in place and secure. The speed was checked with a tacho and found...

Thanks for all the replies so far. To summarise. "Impeller isn't collet mount, is it?"............ No it is keyed on and has a retaining bolt. I,ve not removed the impeller yet but assume the key is in place. "Snapped/broken shaft or coupling between the motor and impeller"............ as...

Thanks for your reply bimr. I checked the direction and it's correct. The pump is a vortex pump with a recessed impeller which looks to be in good condition. Just thought there may be some obscure electrical fault causing it to run slower than normal. Hopefully we can get the hopper drained...

Guys, We have a submersible centrifugal pump sat in a grit king hopper. It pumps up a vertical 150mm pipe 6m long ( or it should )before gravitating into the grit classifier. Ops reported that it will not pump. They've assured me that the hopper is clean, and the discharge pipe is clear. We...

First thing would be to educate the home owners as to what can and cant be flushed into the sewer. Next fit pumps capable of handling rags, ie, Flygt N type impellers. Introduce pump down cycles to clear everything from the well once a day. Alter stop and start levels so the pumps cycle more...

Thanks guys. Have passed the comments on to the electrician. Will post again once resolved.

On a 2 pump sewage pumping station, one of the pumps trips out occasionally. Once it is manually reset, it can be started and will pump. Telemetry reports reveal the pump seems to "fail" and send out an alarm 5 minutes after it has stopped. The pump has been split to see whether it is blocked...