Build Daily

Plumbing Installation And Repair

August 12, 2017 18:06

Pump to increase water pressure

You open the tap - water and it implies a sluggish stream.Wash your hands and rinse the dishes, with grief in half, still missing, but take a full shower - it does not turn.Even worse is the case with a complex electrical household appliances - gas water heater just will not start, and the displays of washing machine or dishwasher displayed notorious «Error».

Pump to increase water pressure

pump to increase water pressure

The situation is very sad, but, unfortunately, quite common.To a large extent it faced by residents of urban high-rise buildings - in the peak hours of water pumping pressure in the water on the upper floors plummets.But in no way immune to similar and homeowners "on the ground" that are connected to the municipal water supply networks - we have to admit that the quality of public utilities service is often very far from acceptable performance.So, you need to take any action.

It would seem - is clear output.It is necessary to set the pump to increase water pressure, and the problem go away by itself.However

, such a measure is often a "half-hearted solution", ie does not remove the issue entirely.And in some cases, installing such a pump only and does becomes a waste of money, since it requires more in-depth, systematic approach.

main thing - to understand the reasons for the weak water pressure

Article Contents

  • 1 main thing - to understand the reasons for the weak water pressure
    • 1.1 Calculator experimental determination of the pressure in the water
  • 2 What can be done?
  • 3 Pump selection for increasing water pressure
    • 3.1 Video: installation of the pump flat to increase the water pressure
  • 4 Choice pumping station
    • 4.1 Calculator necessary head home pumping station
    • 4.2 calculator for calculating the required capacity of the pumping station
    • 4.3 Video: tips for choosing the automatic pumping station

The technical documentation of pumping equipment, articles tons descriptions on this subject, on the scales of the instrument can be used a variety of pressure unitsin the water.To immediately add to this question is clear, give a small plate, which will help navigate the future:

Bar Technical atmosphere (atm) meter water column kilopascals (kPa)
1 bar 1 1.0197 10.2 100
1 technical atmosphere (at) 0.98 1 10 98.07
1 meter water column 0.098 0.1 1 9.8
1 kilopascals (kPa) 0.01 0.0102 0.102 1

Too high accuracy at the household level, we do not need, therefore, to assess their conditions, with quite acceptable error level, you can do approximate ratio:

1 bar ≈ 1 at ≈ 10 m of water.Art.≈ 100 kPa ≈ 0.1 MPa

So, how much pressure is considered normal for a tap home network?

In accordance with applicable regulations, the final consumer water should be supplied at a pressure of about 4 bar.With such a head of work will be provided by virtually all existing plumbing and appliances - from conventional taps and flushing cisterns to hydromassage showers or baths.

However, in practice such a smooth pressure is extremely rare.Moreover, the deviation in a smaller or larger side are quite significant.And, both phenomena can seriously affect the correct operation of the domestic water supply system.Thus, when the threshold is exceeded in 6 ÷ 7 bar may be occurrence of depressurisation pipe joints for Valves.In races up to 10 bar there is a high probability of more serious accidents.

But with increased pressure to deal, in principle, is simple - just install at the entrance to a house or apartment a special device, reducer, which will equalize the pressure in the internal layout of the aqueduct, and eliminate water hammer phenomenon.With the right choice or setting gear at all points of the draw will be supported by an optimal water pressure.

Reducers to stabilize the high pressure water

Reducers to stabilize the high pressure water

much sharper problem is, if the observed systematic lack of water pressure in the system.And here is where to start is to try to figure out what is the cause of this phenomenon.But for this it is necessary first of all to have a clear idea of ​​how much pressure in your local home plumbing, whether it varies depending on the time of day or delivery point, how things are, for example, from the neighbors on the landing, and the riser - the top and bottom.This information is largely able to clarify the picture.

The easiest way, of course, measure the pressure with a conventional gauge.Should such a device is not so expensive, and it makes sense to install it permanently at the entrance to an apartment or house.Even better - to be mounted on the input mesh strainer wash water treatment with integrated pressure gauge - solved two problems at once.Will only for a certain period regularly shoot and record evidence about four times a knock - in the peak hours of consumption in the evening and in the morning, in the "normal" day and night mode.Then it will be possible to conduct a preliminary analysis of the situation.

Gauge mounted on the washing filter mesh mechanical treatment

gauge mounted on the mesh filter, wash the mechanical water treatment

can be rented on the farm or at a friend's portable manometer.It is easy to temporarily connect, for example, with a flexible liner, a water outlet faucet or even directly to the spout, permitting a threaded connection.

can produce and homemade simple gauge that despite the primitive structure, nevertheless able to give very accurate results.

To produce such a device will require a transparent plastic tube about 2,000 mm.The diameter of its importance has not - the main thing that it was convenient to perform with tight = its connection with the union, which will be wound, for example, the tap spout-splitter instead of the nozzle.

Simple , but highly accurate method for determining the water pressure

Simple but very accurate method of determining the water pressure

tube before measurement is attached to the tap (in principle, it could be any other water outlet) and positioned vertically.Produced water short run, and then seeking such a position that the liquid level was approximately on the same horizontal line connecting point to the part of the crane had no air gap (shown in the diagram - left fragment).In this position, measured the height of the air portion of the tube ( h o ).

then cutting the upper opening closed tightly stoppered to prevent venting.Crane opened to the full.Water, compressing the air column rises.When the situation stabilizes, a minute or two, will measure the height of the column of air pilot ( he ).

With these two values, it is easy to calculate the pressure according to the following formula:

PB = Ro × ( h o / he)

PB - pressure in the water at this point.

Ro - initial pressure in the tube.There will be a big mistake to take him by the atmospheric, ie 1.0332 at.

ho and he - heights of the air column, experimentally derived

Calculator experimental determination of the pressure in the water

Enter the results of the two measurements and get the result
ho - the height of the column of air before the opening tap, mm
he - the height of the column of air with fully open valve, mm

If measurements are carried out at several points, and indications are obtained by different, it is a sure sign that the possible cause of a pressure failure at this or that the sanitary or household appliance defect lies in the innermost wiring plumbing.It is possible that the old pipe is thorough overgrown rust or limescale and no additional equipment will not change the situation - it is necessary to change the pipe layout.

Demand from this aqueduct normal pressure - simply naive

demand from such a normal pressure water pipe - simply naive

cause of the pressure drop may be a long time not to change or clean the filters - and carrying out appropriate prevention time is getting to the field.

The reason may be hidden and have not served filters

reason may be hidden and have not served filters

readings should be compared with similar parameters in neighboring apartments located on the same level - they should be roughly equal.Sometimes it helps to identify the problem, which lies in water riser.

It would be nice to find out the situation in the neighboring apartments vertically - as a low pressure problem affects them.With an increase in the height of the pressure floor (in meters of water column) should be reduced by about the amount of the excess.

And finally, if, of course, be possible, it is desirable to know the pressure on the "loungers" house that is on sewers in the basement, which is connected to the risers on the entrances.It is possible that the utility meet their obligations, and the water pressure is applied normal to the risers.

So scope of the problem is localized - often "instigator" of all the trouble becomes living below on the same riser landlord that during the repair in your bathroom Sause pipe diameter for one reason or another - "it is cheaper," "so convenient andbeautiful "," so he suggested an experienced plumber "or even" I do all right, and the rest I do not care. "There will either have to negotiate for good, or take administrative measures across the public service.If

and houses collector slight pressure - should "seek the truth" in public utilities, as the quality of the service provided does not meet the requirements.Will it be possible to achieve something - still a big question, as you can hear a lot of reasons: from requiring replacement of pipelines to impossible now to install new pumps to replace obsolete.

What can be done?

If all the steps taken "administrative plan" have failed, and to ensure the correct operation of sanitary ware and household appliances is not enough pressure, it is necessary to take measures technological orientation.Here we have the need to install this or that additional equipment.But, again, to say that the pump to increase water pressure would be a panacea - it would be naive.

This measure will only effective in the case where water flows nearly always smoothly, but it is not enough pressure to operate household appliances.For example, the owner of a private house, connected to the line in which the pressure is constantly there are not more than 1 - 1.5 bar, it will be able to install the pump at the entrance to the house, or even before the draw-point, requiring higher performance.To some extent this is permissible, and in urban multi-storey building, but again - with a stable supply of water, but with a "deficit" of pressure.

Pump to increase pressure , placed in front of a gas water heater

pump to increase the pressure, placed in front of a gas water heater

If the "failures" of head reach that on the upper floors have often been observed complete loss of water from the taps, raising the pump itself does not justify.Firstly, it is necessary to "lean" at the minimum allowable for a given tube model pressure to give the desired output value from the void and it can not create anything.Secondly, the increasing pressure pump necessarily creates a certain underpressure behind.When the pressure insufficiency open on any floor of the lower crane is transformed into a "hole" through which air can be sucked.The pump will start trying to pump air, and in the best case, if it is equipped with protection against dry running, it will just keep off, but if not - if not quickly burn out.And thirdly, in some way to improve the situation in his apartment, the owner of the pump unintentionally worsen the situation in the neighboring.

What's the solution?There are several, but not all will be easy to implement.

1. Set the pump station operating in automatic mode, it is desirable - with pumped-storage membrane tank maximum possible volume.The main element of this station - a self-priming centrifugal pump type, that is capable of self, even at "zero" input pressure to lift water from a certain depth (for example, from the basement reservoir or an independent source) and create very substantial pressure on the outlet.

The required pressure provides a compact pump station

required pressure provides a compact pump station

Incoming usually set pressure switch stations will ensure that the pump motor only at low pressure in the home (condominium) water pipe below the set level.Storage tank will create a reserve supply of water, which will also be under pressure and consumed in cases where water supply lines are temporarily interrupted.

Thus, the pumping station and the water picks up, and creates the necessary pressure in the system, and provides a certain supply of water.The greater the volume of the storage tank, the pump will turn on less frequently.

The greater the volume of the storage tank , the less will turn the pump

The greater the volume of the storage tank, the less will be included

Solution great pump, we can say - the best for private households, but in a multi-storey building with him may have many difficulties.If the pressure in the riser weak, suffer from it, many residents of the upper floors.If they become out of position in this manner, the present building flare competition for "jet" as the total number of incoming water will still be at all sufficient.Again the same situation as mentioned above - sucking water from the pipes lead to airing with all its consequences.Inevitably this vone scandals and proceedings, "denunciations" against each other in the operating organization or in the "Vodokanal".And the installation of such a station without the knowledge of public utilities may well result in a decent penalty as equipment introduces an imbalance in the overall operation of water supply system of the house.

There is another limitation: self-priming pumps are usually limited in depth (in the case of high-rise building - height) of water lift - about 7 ÷ 8 meters.That is, for the first and second floor - suitable, the third - already at a stretch and higher - are unlikely to cope.

2. Set in his home surround free-flow tank, so that it is constantly replenished during the hours of normal water supply, even with low pressure.A simple float valve will not allow the overflow tank.

If such a capacity for at least 200 ÷ 500 liters will be possible to install at the height of the ceiling, the water out of it will be either by gravity flow to the taps, to which it is already possible to install conventional compact booster pumps, or it will be possible to mount on the total output ofpump capacity increases, the power and performance that would be sufficient to use all the devices.As an option - a compact pump station with a small amount of hydraulic accumulator, which has to be powered from a storage tank.In this case, the tank can not raise up, and to find the most convenient place for the conditions for it.

main obstacle to the realization of such a project - the tightness of the standard urban apartments: to establish even the largest capacity is simply nowhere.Again, such a solution seems optimal for a private developer.