Question: For a submersion depth of 5-6 meters, can a self-priming pump be used?

The design institute advises you to choose a self-priming pump equipped with a forced self-priming vacuum extraction device. Otherwise, it’s difficult to use the ordinary one.

Sure, we have just installed pumps of this type. You can inquire about Liaoning Tianyuan Pump Industry; it’s best to choose an electrically assisted diaphragm pump to help operate the centrifugal pump

It must be a self-priming pump; for such a depth, an submersible pump is more than sufficient. . . . . .

The people upstairs are talking nonsense; how can they use a self-priming pump without even checking the temperature of the medium? Aren’t you worried that it won’t be able to draw in air on its own? Since the specific gravity is 1.0, it’s similar to water – so isn’t it necessary to consider temperature? Show me hot water at 90 degrees being pumped up by a self-priming pump.

The submersion depth is 5-6 meters; you must have ignored this factor

One submersible pump we developed in the past performed extremely well; operating at depths of 5-6 meters was no problem for it. The lifting mechanism relied on the guide elements located at the lower part, and this approach worked very well. The upper part served as the pressure generation section, and the guide elements needed only to have a head of 6 meters or more to function properly. The actual pressure generation took place above the mounting plate, which meant that two rotating impellers were used to balance the axial forces. These pumps were very durable, and to this day few customers have requested replacements for their components. We no longer want to promote this product. If we don’t replace the parts, we won’t make any money.

It’s possible, but it’s best to install a bottom valve at the bottom of the suction tube

Regarding the use of self-priming pumps, here’s some experience to share: As long as the design parameters of a self-priming pump meet the conditions of the actual operating environment, it will function properly during the first few years of use. However, as the pump ages and suffers from wear and tear, along with the deterioration of its components such as the rubber check valve at the pump inlet, the pump may no longer operate according to its original design specifications, which can result in an inability to draw liquid in. If the auxiliary self-priming device (electric or pneumatic vacuum pump) is not installed, it is very difficult to fill the pump on site. (I attached a strip of tape at the inlet valve of my on-site self-priming pump before starting it and filled it with water, but it was still difficult to start. It is also not recommended to install a bottom valve, as over time it may fail due to impurities in the medium or corrosion. If there is a power source on site, a ejector can be designed and connected directly to the pump casing or near its inlet; by creating a vacuum before starting the pump, startup can be made smoother. A few suggestions; feel free to discuss them :)