Connecting a pumping station to a well and a well, diagrams and features

Recommendation points

• Connection of a station with a surface pump
• Using recirculation
• Double-pipe pumping station
• Submersible pump connection

We have prepared for you examples of connection and piping schemes for the pumping station, considered the possibility of increasing the reliability of its operation using water recirculation, as well as using an ejector for deep wells. We will also analyze the possibility of using submersible pumps.

The main element that determines the reliability and technical characteristics of the pumping station is the pump. The choice of most pumping stations comes down to choosing the pump that meets your needs..

Connection of a station with a surface pump

Pumping stations with a surface pump can only be used if the distance from the water mirror to the pump inlet is no more than 8 m.

For example, if you have a well or borehole 12-13 m deep, and the distance to the water surface is 10 m, then the pumping station must be “bury” to a depth of 2.5-3 m.

In such cases, they arrange pits or a more technological solution – the use of a caisson.

It should be remembered that although all manufacturers call their products self-priming, neither a vortex pump nor a centrifugal pump are. In order for the pump to work and not fail, it is necessary to fill the pump housing and supply pipe with water. This will ensure that the pump starts reliably..

The end of the suction pipe should be at the maximum depth, while the height from the bottom should not be less than 100-120 cm.

Installation should be started by installing a check valve with a coarse filter on the pipe. The filter will prevent large impurities in the form of stones and sand from entering the water supply system. The non-return valve will provide water column support and protect the pumping station from idling. The connections must be carefully sealed to prevent air from entering the water supply system.

1 – check valve with filter; 2 – pumping station; 3 – adapter for a plastic pipe; 4 – shut-off valve; 5 – caisson; 6 – to the water supply of the house

A shut-off valve is mounted at the entrance to the pumping station, an American, if necessary, a knee and an adapter with a coupling on a plastic pipe.

In the case of a well, ready-made heads can be used, which are already equipped with a pipe outlet and an eye bolt. Additionally, the head seals the wellheads of the casing, increasing the flow rate of the well.

A water supply system is connected to the pump outlet.

Using recirculation

The recirculation line is used to maintain a backwater supply and protect the pump from idling. It must be understood that part of the pump power is wasted..

To organize recirculation, a tee must be installed on the water supply pressure pipe. It is advisable to install a shut-off valve on the recirculation line. It will provide regulation of the water flow. The second tee must be installed on the suction pipe in a convenient place and connect the recirculation pipe.

1 – tee; 2 – shut-off valve; 3 – recirculation pipe

When repairing or maintaining the water supply system, so as not to relieve the pump pressure and refill it with water, install a tap on the accumulator, then you will leave pressurized water in the accumulator. After repair, simply unscrew the valve and the pump with a pressure pipe will fill with water. In most cases, the accumulator stock is sufficient to fill the pump and start it up.

Such simple actions will increase the reliability of the uninterrupted operation of the system..

Double-pipe pumping station

Under conditions when it is necessary to raise water from a depth of more than 8 m and there is a pumping station with a surface pump, the system must be supplemented. For this, a special device called an ejector is installed at the pump suction..

In this case, two pipes of different diameters are lowered into a well or well. In most cases 32 mm suction pipe and 16 mm recirculation pipe.

A nozzle with a narrowed section is mounted in the ejector body. Water is supplied through the pipe from the recirculation to the ejector chamber. Due to the narrowing, the water flow rate at the outlet of the nozzle is higher than in the pipe at the suction. The water creates a zone of increased pressure, providing the necessary back-up on the suction pipe. A zone of reduced pressure is formed under the nozzle, which will provide water supply to the ejector from the well.

Pumping stations with an ejector can lift water from a depth of up to 30 m.

It is also necessary to install a check valve with a coarse filter on the suction pipe of the ejector. Connect a pipe with a non-return valve to the outlet of the suction chamber.

1 – check valve with filter; 2 – ejector; 3 – suction line; 4 – recirculation pipe

Pumping stations with a remote ejector can be located at a considerable distance from the water source – up to 40 m horizontally, which makes it possible to install the station in a house without installing additional technical structures.

Pumping stations with an ejector must be selected with a higher power, since part of the energy is spent on recirculation.

Submersible pump connection

Pumping stations with submersible pumps are successfully used for wells and wells of any depth. Submersible pumps are of several types:

• vibrating;
• centrifugal;
• drainage (well).

Regardless of the type of pump, they must all be below the water level. Water cools the pump, preventing it from overheating.

The connection and operation of the vibration pump is highly dependent on the frequency of the electrical network. For the operation of some models of pumps from Western manufacturers, a network frequency of 60 Hz is required, instead of the 50 Hz that we have. Such a pump will work, but its efficiency will be controversial.

Before lowering the pump into the well, check the tightness of the connecting screws. Since the pump is vibrating, they tend to spin up. The vibration pump must be revised regularly.

In some cases, centrifugal submersible pumps are the only solution for raising water from any depth. They have a large number of impellers (20 or more), which provides a large head at the pump outlet. This in turn increases the length of the pump. Therefore, such pumps cannot be used in wells with a low water column..

The pump is installed at the maximum well depth, at least 50–70 cm from the bottom of the well. The pump is fixed on a metal or polyamide rope. A check valve is installed on the pump, and then a pressure supply pipe.

1 – check valve with filter; 2 – submersible pump; 3 – cable

Depending on the manufacturer and model, the length of the electrical cable may not be sufficient for installation in the well, then it is necessary to arrange a sealed cable gland. The other end of the cable is attached to the eye-bolt of the head, securely fixing the pump in the well.

The advantage of this scheme is that the hydraulic accumulator with the automation unit can be placed in any convenient place..

Submersible drainage pumps can also be used to organize a water supply system for a small house with 3-4 water sockets. Depending on the model, they create a pressure of up to 1.5 bar and have a high performance. Drainage pumps work quietly in polluted water or water with solids up to 5 mm, industrial models up to 120 mm.