How to choose a well pump: capacity and head

The modern level of progress has allowed villagers, suburban cottage settlements and dacha owners to organize a convenient and efficient water supply system at home based on a well or well. Now there is no need not only in buckets, but also in overall containers, usually placed in an attic space. Knowing how to choose a pump for a well, it is possible to assemble a pumping station and fully automate the process of obtaining water from an underground source. On the correct selection and will be discussed in this article.

Basis for selection

Before you go to the store to buy, you need to decide on some key points that serve as the selection criteria. We list them:

- the distance from the well to the crane. Since for every meter of the length of the pipeline there is a certain loss of pressure, this value can not be ignored;

- available water volume. Also, you should determine the debit, i.e. Experimentally find out for what period of time the well or well is being filled. Obviously, it makes no sense to purchase an excessively efficient pump with a small volume of water and a small inflow - everything must be balanced;

- depth from the surface of the earth to the mirror of water;

- approximate consumed volume. It should not exceed debit.

All these data are sufficient, so that if necessary, the consultant can help determine the appropriate modification of the pumping equipment.

How to choose a pump for a well

All existing solutions for supplying water from underground sources can be divided into two types - submersible and surface. The design of the first involves placing the device in the water column suspended on a special cable. The latter, in turn, are not sealed and if moisture enters the engine windings, they can fail. In addition, the very principle of operation and the capabilities of each device is different. For example, household submersible pumps can be vibrational (the most inexpensive option), auger (compromise design) and centrifugal. The superficial can not boast of such abundance. Therefore, telling how to choose a pump for a well, we will talk about submersible models.

All such pumps have only two basic parameters that affect the operation of the entire system: nominal head and capacity. Peak values are interesting only from the point of view of a certain "margin of safety" - prolonged work in such modes is not recommended. When studying the question of how to choose a pump for a well, it is worth paying attention to the fact that the two above characteristics greatly affect the final cost of the device.

Therefore, in some cases, it makes sense to change the supply scheme (for example, to organize a well for a hydraulic accumulator) without overpaying for a more efficient pump.

Submersible pumps for wells. Selection by parameters

Suppose that the distance "surface - water mirror" is 16 m, and to the point of draw-off (horizontal) - 20 m. An abstract submersible pump, presented in the store, is capable of delivering 2500 liters per hour with a head of 60 meters. We consider the pressure loss: 1 The atmosphere corresponds to a rise to a height of 10 m, and on a horizontal straight line - 10 times less.

For this model with its 60 m head at the outlet of the pipeline will be 60-16-2 = 42 m or 4.2 Atm. Taking into account the transitions and bends, we finally get 4 Atm. Since the norm is from 3 to 4 Atmosphere, this model is quite suitable.

The amount of water supplied can be calculated using the schedule attached to the data sheet. Having determined the losses (16 + 2 = 18 m), it is necessary to draw a line from this point to the curve on the graph and from the point of intersection - perpendicular to the other axis. Get the performance.