Submersible vs. Vertical Line Shaft Turbine Pumps and difference in efficiencies 2

[CivilG]

Could someone please tell me which is more efficient, submersible pumps or vertical line shaft turbine pumps and why. I was told one is better than the other; however, I thought they both can turn impellers inside bowls and there would be no difference. The only difference I thought is that a submersible is powered by a motor beneath the bowls and a vertical line shaft gets power from the well head via a line shaft.

Thanks,
Civil G

 

[bimr]

How much time do you have as it is not a simple question. The answer will depend on the capacity of the pump and the type of pump station. The efficiency of the pump will depend on the application as well as the particular pump selected. Some of the submersibles with oil filling will be less efficient.

Submersible pumps are attractive because the pump station will be less expensive overall. However, over the life of the pump system, submersible pumps will tend to have a higher cost because the maintenance cost is higher. Maintenance can't be done on a submerged pump and it will have to be pulled.

Vertical line shaft pumps are probably just as efficient. However the cost of the pump station will be more expensive as it is larger.

Pumping Station Design by Garr Jones has a more in-depth discussion.

 

[cvg]

https://www.waterworld.com/articles...turbine-pumps-advantages-and-limitations.html

 

[77JQX]

We prefer lineshaft where well construction allows. Reasoning is based on differences in the motors: (1) we can change an above ground motor in a day with our service truck cranes, while a submersible requires a drill rig to trip the pump out of the hole (resulting in about a week's outage), (2) lower efficiencies from submersible motors, and (3) higher cost for submersible motors, especially if you need NSF certification. The pumps themselves are of equal quality.

 

[bimr]

https://www.waterworld.com/articles/print/volume-3...

Don't believe that the article addresses the OP question:

"It should be noted that the above comparisons do not apply to single stage (non-VTP) submersible pumps (see Fig. 3) where the motor is located above the impeller and casing. Such motors are not restricted by small well casing sizes and can often compete in efficiency with aboveground motors."

 

[Artisi]

Far too many variables to be specific without a lot more detail from yourself. Application and size being the main one.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)