Would it be wise to design multi-stage non-clog sub. sewage pumps?
Would it be wise to design multi-stage non-clog sub. sewage pumps?
(OP)
This is a spin off of my last thread in the Pump Engineering Forum "Non-clog low flow high head pump." My original question was to find a pump that could perform at 314' TDH and 170 gpm flow. So this is my follow up question.
Why don't pump engineers/mfg's design a multi impeller non-clog submersible sewage pump? Would it be unfeasible? Is it such a unique situation that only one or two would be sold per year worldwide? Is it in the design of the impeller and its application? And why can't these impellers be more efficient at lower flows like like 80-percent instead of 35-50%.
Maybe I should find a pump engineering training course for my IDP (individual development plan) here at work...
Why don't pump engineers/mfg's design a multi impeller non-clog submersible sewage pump? Would it be unfeasible? Is it such a unique situation that only one or two would be sold per year worldwide? Is it in the design of the impeller and its application? And why can't these impellers be more efficient at lower flows like like 80-percent instead of 35-50%.
Maybe I should find a pump engineering training course for my IDP (individual development plan) here at work...





RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
This is to prevent the accumulation of stringy material. Subsequent stages in multi-stage pumps would have an impeller mounted between bearings, with a shaft through the eye. This is considered too risky for solids handling services, from a solid passing perspective. That is why no one designs multi stage solids handling pumps.
The need for high heads (in conjunction with the poor solids handling characteristics of very low Ns/skinny impellers) leads station designers to utilize single stage standard pumps in series. Luckily, this situation does not arise too often. It occurs most often in areas where wastewater must be pumped to a central interceptor or regional WWTP, in a very hilly area..some areas of the Western US for instance....
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
(Raw) sewage pumps are usually centrifugals. They can be submerged and are still the best choice.
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
I have a grinding station in my front yard. Every two houses has one. It grinds up the solid waste so it can be pumped efficiently to the treatment plant.
Charlie
www.facsco.com
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
However the question was about designing a multistage low flow high head raw sewage pump, and anyway CrazyHorse81 seems to have vanished.
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?
And how did you know that I vanished Artisi? I guess I don't live and die at Eng Tips. I went on a two day trip to visit the lift station that we are replacing. It is a mess...there are three phase pumps running off of vfd motors powered by single phase...one pump is running constantly...one pump is out of order...the wet well is full of rags paper rocks sticks anything you can imagine...there is approximately 1/2 of the wastewater flow going into the primary cell and the remainder is overflowing...
RE: Would it be wise to design multi-stage non-clog sub. sewage pumps?