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Thanks a lot guys! My higher ups doesn't acknowledge a problem exist and they said it is normal design. I have it all on record. Construction is on going and pumps already purchased. I asked for an actual plant reference and currently waiting for feedback.

Hi Everyone, We have a rectangular concrete potable water tank, per figure below. Tank is 25mx25m. Depth of water originally at 2m. Free board of 0.6m, manhole, vent, over flow provided. (top image) We later found out the pump head are not enough. Instead of buying pump with greater head...

Thank you ashtree!

Hello Everyone! Suppose I have 3+1 VFD pumps abstracting 18000 m^3/day of water from a filtered water tank. The pumps discharge at a common header. The header then branches into two pipes, one goes to disinfection tank, one goes to the RO then to the disinfection tank. See figure below...

Yes, PM is also an engineer, double-degreed. He is actually pretty good in process stuff. I already brought this up and we had a long written correspondence. He said he does not agree with my interpretation. See attached rough sketch I sent 2 weeks ago. I also added that there might be pressure...

I'm really glad I posted here, your comments are very helpful! Originally, I objected to the bottom loading but all my reasoning is theoretical-based. I only have 4 years exp. in WW Treatment while PM has more than 2 decades, so I said I defer to his experience. All this I have on email. EM is...

Thanks Zelgar! PM said he've seen many times and I trust him. Also, pump supplier didn't gave any comment regarding this. For working against gravity, does the pump really push-up all those materials inside? At 3.0m high, that's about ~40T of sludge! What about pressure at the bottom of the...

Thanks a lot micalbrch! Btw, it is PC Pump is Seepex.

Thanks again guys! 'Oldest sludge gets discharge first', my engineering manager had similar reasoning, but project manager wanted to inject at bottom to save on piping/fittings. Sludge hauling is frequent anyway so I guess we are ok. Also what will happen if pump stops, then there is sludge...

Very helpful and informative post, thanks heaps bimr! You are right about structural engineers complaining about this, and I wish I can still change the sludge silo part, but it looks like this is where we are heading. Theoretical sludge production is 30 m^3/d. Conveyor capacity is 15m^3/h...

We are still in design stage. We will equip the bottom of bin with slide gate valve. I attached some preliminary layouts. From belt press, it drops to a cavity pump equipped with a bridge-breaker. The breaker acts as mixer for the lime and sludge. The two sludge feed pipes will join to a...

@ Bimr, I believe I misunderstood the part about the shaftless screw conveyor. You were talking about using shaftless conveyor to convey sludge instead of piping. We do not have much space so we use piping. In my post above, I referred to the conveyors at the inside bottom of the sludge silo...

Thanks for the answers guys! @Bimr, water content after dewatering sewage sludge is 75%. We have considered shaftless screw conveyors, it required 8 motors (2 sets of twin conveyor, each pair of conveyor with 4 motors), operation guys think it will cause maintenance issues so we switched with...

Hi everyone! We have a 15 bar progressive cavity pump that is conveying lime-treated sludge to an 8-m high, 4-mΦ cylindrical concrete silo at the rate of 5 m3/h. We decided to inject the sludge cake at the bottom of the silo instead of the top as shown below: Diameter of conveying stainless...