How to flush the heating system in a private house?
Recently, pipes with a low temperature have been observed in the house. Many say that this is due to the fact that the heating pipes are clogged. Here are the questions:
- Can I flush heating systems myself?
- When do you need to flush the heating in a country house?
- How to clean radiators?
A low temperature in the radiators may indicate an air lock or blockages in the heating pipes. During the operation of heating systems, there are cases when one or more radiators partially or completely do not warm up. The most common causes of such malfunctions are the formation of air pockets in certain sections of the pipeline.
Blockages occur as a result of dirt entering the system, with the deposition of corrosion products on the inner surface of the pipes. Most often they occur in pipe bends, branches, lower connections to heaters, crosses located on horizontal sections, crosses and tees, in transitions.
When a riser (a separate device) is clogged, as a rule, the resistance of sections of heating systems increases and the flow rate of the coolant circulating through them is maintained, as a result, the average temperatures of heating devices in these areas decrease.
When a riser is clogged in a two-pipe heating system, the normal temperature of the surfaces of all heaters connected to this riser is observed before clogging (circulation before clogging is not disturbed). After blockage, the temperature drops sharply, which occurs as a result of a reduction in the flow of coolant in the heating devices of the system or a complete stop of circulation through the devices.
When flushing is needed
Cleaning the heating system will be needed if you notice the following signs during the heating operation:
The manifestation of at least one of these signs may indicate that the heating system is clogged.
Companies that flush heating systems recommend several basic methods for flushing pipes.
Chemical flushing of pipelines
The most common option for flushing pipelines is chemical in-place flushing of heating, which makes it relatively easy to transfer the vast majority of scale and deposits into a dissolved state and wash them out of the heating system in this form. for flushing the heating system, acidic and alkaline solutions of various reagents are used.
Among them are composite organic and inorganic acids, for example, compositions based on phosphoric acid, sodium hydroxide solutions with various additives, and other compositions.
Chemical flushing of heating pipes is a relatively cheap and reliable method that allows you to rid the heating system of scale and pollution, but it has certain disadvantages. Among them – the impossibility of chemical washing of aluminum pipes, the toxicity of washing solutions, the problem of utilizing large amounts of acidic or alkaline washing solution.
At the work site, a special tank with a pump is used, connected to the heating system. After all the necessary chemicals have been introduced into the heating system, the cleaning solution circulates in the heating system for a time that is calculated individually depending on the degree of contamination of the heating system. Chemical flushing of heating can also take place in winter, without stopping the heating system. Chemical flushing of heating is 10-15 times cheaper than a major overhaul of the heating system, and prolongs the period of normal operation of heating systems.
This is an innovative way to flush heating systems. The difference between disperse washing and chemical washing is that during dispersed washing, the reagent penetrates into the structure of the deposits and weakens the mechanical bonds between the molecules of the deposits, without entering into a chemical reaction with the metal of the system itself.
Dispersive washing has a number of advantages over chemical washing:
Reagents do not destroy the heating system, it is possible to flush systems with aluminum radiators
Flushing is environmentally friendly, the spent reagent, together with sediments, can be disposed of into the sewer without damage to biological treatment facilities
Deposits are removed from the system in the form of a fine fraction without clogging the pipes
The flushing solution creates a protective hydrophobic film on the internal surfaces of the pipeline, protects the system and extends its service life.
The flushing technology is as follows: a circulation pump is connected to the heating system, the reagent is charged in the calculated amount and the system is switched on for circulation. The reagent disperses (penetrates) into the deposits, weakens the mechanical bonds of the deposits at the molecular level and is washed off by the coolant flow. As the solution becomes contaminated, it is washed down the drain. Dispersed flushing of heating can also occur in winter, without disturbing the temperature regime. To do this, an external heat exchanger is installed, which provides a closed circuit of the heating system of the building with heating from a centralized network.
Hydrodynamic method of flushing pipelines
Hydrodynamic flushing of heating pipes consists in removing scale by cleaning the heating system with thin jets of water supplied to the pipes through special high-pressure nozzles.
Hydrodynamic flushing of pipes is more than 2 times cheaper than replacing equipment.
Pneumohydropulse flushing of pipes
The method of pneumohydropulse cleaning allows flushing pipes by means of multiple pulses performed using a pulse apparatus.
In this case, the kinetic impulse wave creates cavitation bubbles from the gas-vapor mixture in the water filling the heating system, resulting from the passage of a high-intensity acoustic wave through the liquid during the rarefaction half-cycle. Moving with the flow of water into an area with increased pressure or during a half-cycle of compression, the cavitation bubble collapses, while emitting a shock wave. Turbulences of water with air tear off deposits from the walls of the pipes, and the subsequent wave of the air-water mixture carries away the scale that has risen from the bottom.
Electrohydropulse installations are designed to remove scale and deposits from a wide range of equipment. The principle of operation of the installations is based on the use of the energy of an electric discharge in water. The shock wave and hydrodynamic flows formed during the discharge in water destroy scale without damaging the pipe.