A well is an expensive construction, especially if it is fed from artesian waters. In this case, you will have to spend money not only on the construction of a hydraulic structure, but also on obtaining a license. The best option would be to agree on the creation of a common source of autonomous water supply for two houses.
Advantages and disadvantages of the method
The advantage of such a water supply scheme is obvious - creating a well and registering it will be cheaper. There will also be less maintenance costs. But there are significant disadvantages:
- possible conflicts between neighbors due to territory or electricity;
- problems selling the site to one of the participants in the scheme;
- errors in the calculation of the flow rate, leading to a shortage of water for all consumers.
A two-house well is more difficult to build, since it is necessarily equipped with a caisson, which is necessary to build a water supply. There may also be a problem with the installation of water meters, which are mandatory for licensing. After all, there should be two or more, depending on the number of owners of the well.
Wiring diagrams
There are three main ways to connect water supply from a common well to two sections:
- with one pump and one accumulator;
- with one pump and two hydraulic accumulators;
- with two different pressure devices.
The first method is suitable if neighboring buildings are located close to each other, the maximum distance is 100 m. Connection of system elements is carried out in the following sequence: pressure equipment - non-return valve - pressure switch and automation unit - hydraulic tank. Next, a tee is mounted on the pipe that comes out of the battery and wiring is performed. The drive itself in this situation is installed in the caisson.
The second option is used if the buildings of the well owners are located far from each other. The connection diagram is as follows:
- Mount the tee on the pressure pipe.
- Highways to each house are bred from him.
- On water supply systems, storage tanks are installed.
A similar option is applied if the water discharge in the well is large. It is very difficult to find a giant hydraulic tank and install it in a caisson. It is wise to use two small containers. The pressure switch and the automation unit are placed before wiring.
Individual hydraulic accumulators with mounting a pressure switch in front of each will be required even when the well will provide more than three houses. In the caisson in this case, only the piping to the buildings is performed.
At high costs, it is especially important to calculate the flow rate of the source so that its rapid devastation does not occur. If the water level drops, there is a danger of the pump running dry. Continuous operation, if dry run protection is not installed, will cause equipment failure.
Well production should exceed the total average water consumption of users. The flow rate of sand intakes does not exceed 1.5 cubic meters per hour on average. Such a well can provide a maximum of two houses. Three or more buildings will require an artesian well. Its cost is more than sand and it may turn out that economically it is almost not profitable even in comparison with punching three wells on sand. But such a device is much more durable, and the water from it is cleaner.
The scheme of connecting one common well to two houses with two pressure devices allows solving the problem of productivity and power during the redistribution of water resources.The choice of pressure equipment model depends on the conditions in which it is planned to be used. Each combination of pressure equipment has its own characteristics.
Two submersible pumps
If the water surface is located at a considerable depth and the casing section is sufficient, two submersible pumps can be installed in the well. The main difficulty of this scheme is that each device must be freely suspended, and at the same time they should not touch the walls of the mine.
Unlike vibration equipment, which can even damage a steel pipe, the ratio of centrifugal pumps to construction is more gentle. But even a small vibration comes from them. To avoid damage, it is better that there is a gap between the equipment and the wall.
There are two ways to equip a well with such pumps. The first is through a conductor, on which both units are suspended. To hold the suspension, a common cable with a large margin of safety is used. The water supply pipe of the lower pump bends around the upper by means of fittings.
The second method assumes that the upper apparatus is suspended in the shaft, and for the pump below the platform is equipped, which is held by two cables. The water supply pipe is assembled in exactly the same way as in the first embodiment.
Two surface pumps
Pressure units located on the surface are not so critical to the cross-section of the pipe, since only hoses are placed in the shaft. Both pumps operate independently of each other. Sometimes it is not even necessary to connect each unit to a hydraulic accumulator. When using one device only for watering the plot, the outlet hose from it can be drawn directly.
But such installations have a drawback - their efficiency is only possible with a well depth of up to 8 meters, which sets a fairly rigid framework for their use.
A scheme using two autonomous water supply pipes is used for standard sized boreholes. In Abyssinian wells with a “needle” cross section of 25-50 mm, there is enough space for only one hose, so a tee is mounted at the inlet to the well, and each device is connected using a non-return valve. The disadvantage of this scheme is the impossibility of simultaneously operating two stations.
Submersible and surface pumps
Combined connection is used when none of the devices individually is capable of supporting the necessary water supply parameters. To create the required pressure in the system, two pressure devices must be connected in series to one well. Submersible equipment delivers fluid to the pumping station, and it, in turn, provides sufficient pressure in the water supply.
Since both devices in such a scheme mutually complement each other, their work must be coordinated:
- make sure the same performance of both pumps;
- synchronize the start-up of devices by simultaneously connecting them to a pressure switch;
- use dry run monitoring for each unit or provide general protection.
Surface and submersible pumps may not be complementary. If technical specifications permit, they can be operated autonomously to organize the water supply of individual farms.
In order not to mess with two pumping units, inventing special fasteners and installation methods for them, it is easier to buy a powerful pump for two sections, and equip each house with an individual hydraulic accumulator. The automatic start and stop of pressure equipment can be set so that the unit is launched from any location.
