Pump head - what is it? How to determine the required pump head

Pump - quite useful thing in every house, especially in private. It can be used to pump water from the well, to eliminate the consequences of flooding in the basement and cellar, wheel pump and inflate the mattress for your arrival. The use of superficial pumps and stations is large enough, modern manufacturers offer a wide variety of models, each of which has its purpose. The selection process should first focus on the type of pump, its function, and, of course, those key indicators that characterize its effectiveness. The pump head is just one of these indicators. This is the second performance indicator of the efficiency of use of the equipment. In this article we will not only try to understand what the working pressure of the pump, its importance, and the methods of calculation.

General information

The Pressure of the pump is from a scientific point of view, the pressure force created by the blades or pistons are required in order to force water or air. The basic unit of measure for this figure are in meters. Do not be afraid, seeing the package that is the designation - it has a scientific basis.

Consumption and pressure: find the difference

The pump Flow, pressure - these indicators are quite often confused. And here it is important to understand that the pump flow represents the amount of fluid passing over it in a given unit of time, usually represented by cubic meters per hour. Simply put, the ability of the pump to pump a certain amount.

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Why in metres

Pump for water pressure or any other liquid is a very popular device, without which it is difficult to imagine life in a private home. Many consumers still do not understand why the measurement of pressure is carried out is in meters.

The Pressure of the centrifugal pump, however, like any other, generally measured in meters. Of course, such a system gives rise to many questions. First of all, as happened historically, all have long been accustomed to such designation and not going to change anything. And, of course, it's convenient, it's not necessary to resort to the use of other units of measurement, perform complex mathematical calculations. The value of pressure, calculated in metres, gives us information about what the pump can lift the liquid at this height.

How to determine the desired pressure

When Choosing a pump it is first necessary to start from its purpose, the specifics of the use and basic characteristics of his work. The pump head is, incidentally, the main characteristic that is specified by the manufacturer in the instructions. The calculation of the pump head requires no special skills, special skill, he can deal even to the layman. It is clear that in many respects the results of the calculations is affected by the design of the selected pump. In each case, the result will be different.

Head submersible pump

Submersible pumps are most commonly installed in deep wells, there where self-priming pump is just not up to pumping the water. This kind today is very common: the design presents a sufficient variety of models and modifications, each of which is able to satisfy all the needs of modern buyers. Many experts highly recommend to buy pumps imported, but even among the Russian companies quite worthy manufacturers whose products are of the highest performance, efficiency and, equally valuable, affordable. In the process of operation, the pump is completely immersed in water, and the approach of the liquid to the critical point it is deactivated in automatic mode until the water level rises to the required standards.

That is why one of the most safe and reliable is a submersible pump. Pressure it is calculated by the formula:

H = height H + H loss + H spout where:

H is height - the height difference between the pump and the highest point of the water supply system;

H loss - possible hydraulic losses that occur when moving the fluid through the pipe, they are primarily associated with friction of fluid about pipe walls;

H spout - the spout head, which allows you to use all plumbing devices (usually in the range 15-20 meters).

The Pressure of the circulating pump

We have already established that the pump head is the pressure required to push the liquid to a predetermined height. Circulation pumps found yourself in heating systems, it ensures uninterrupted circulation of a heat source in the system. Of course, the choice of the circulation pump it is necessary to approach more consciously and more demanding, knowing that this largely depends on the effectiveness and continuity of its use that is so important for apartment buildings. These pumps are reliable, efficient and have proved to be excellent even in apartment buildings. Of course, such a pump should also be selected on the basis of the pressure. The pressure of the circulation pump has no connection, and,accordingly, depending on the height of the building. The main thing here is the hydraulic resistance of the track. And here is for the calculation you will need the following formula:

H = (R * L + Z amount) / ( p * g ), where:

R - losses;

L - length of the pipeline, measured in metres;

Z total is the number of the safety factor for structural elements of the pipeline (for fittings and valves this value equal to 1.3; for thermostatic valves and 1.7; and for mixers 1,2);

R is the density of water, from school physics course we remember that it is 1000 kg/m3;

G - acceleration of free fall, the value of which is taken at an average value of - 9.8 m/S2.

So, knowing all the main parameters to determine the water pressure, which is necessary in a specific situation, quite simply, you don't have to bring in specialists.

Can the installation can affect the size of the head

Considering the simplicity, even the primitive design of the pumps and the availability of detailed instruction of installation, many men undertake the work independently, that is without the help of professionals. This behavior is most likely due to the desire to save money: not everyone is ready to pay not only for the pump or pumping station, and a wizard. Given that the pump head is the main feature of its activities, no one is willing to lose. Therefore, the question suggests itself: how installation carried out can affect the magnitude of the pressure.

It would Seem that one pipe connected to the suction pipe, the other to what is responsible for the pressure, the power supplied. In practice, the slightest mistake not only can adversely affect the water pressure, but will significantly reduce the duration of the work.

Fixed bugs installation

Let's examine the most common mistakes made by many of us:

• Diameter of the suction pipe. Quite often, the diameter of the pipeline in practice is less than the diameter of the inlet tube. This design in the case of connection increases the resistance from the suction line, thereby reducing the magnitude of the suction depth. In simple terms: small diameter tubing just unable to pass the size of the liquid, which easily draws in and pumps the pump.
• Direct connection to a conventional hose. Such a system is not particularly critical when using a small pump performance. Otherwise, under the effect of high pressure generated by the pump, the hose will be compressed, its cross section is significantly reduced and the water can not pass through it. It is in the best case will lead to the termination of the water in the worst - damage to the pump without the possibility of its subsequent repair.
• A Large number of twists and turns in the pipeline. The option of mounting does not increase the amount of resistance, reduces the performance and the size of the pump head. That is why it is so important to lead a number of twists and turns to the minimum value, if you want to use a purchased and installed the pump at 100%.
• Sealing. Due to insufficient sealing of the suction pipeline can be significant loss of water. Poor sealing not only reduces water pressure, but also accompanies the process of pump operation with excessive noise.

The details of the choice

So, if you are faced with a choice of pumps, both submersible and circulating, for the first time, we strongly recommend you take advantage of all the tips and advice. First of all, trust only the proven manufacturers, quality products which do not cause the slightest criticism. Do not neglect the help of professionals: they are from all the presented variety will help to choose the best option, starting from the basic requirements of the characteristics of the operation.

Summing up

In this article we have considered what is a pump head that affects its value, and how to calculate it. I hope that these tips and tricks will help you avoid fundamental mistakes and to use the device at 100%.