Why do pressure testing of the heating system take place? How to pressurize a heating system. What does it mean to “pressurize the system”?
To put the heating into operation, it is necessary to flush and pressure test the system. After completing this procedure, a certificate is filled out confirming that the installation of the heating network was done correctly. Employees authorized to perform this work are required to complete all relevant regulations.
SNiP crimping rules
Crimping standards heating system are described in documents such as SNiP 41-01-2003, and also 3.05.01-85.
Air conditioning, ventilation and heating - SNiP 41-01-2003
Hydraulic checks of water heating systems can only be carried out at above-zero temperatures in the premises of the house. In addition they must withstand water pressure of at least 0.6 MPa without damaging the seal and destruction.
During testing, the pressure value should not exceed the limit for those installed in the system heating devices, pipelines and fittings.
Internal sanitary systems - 3.05.01–85
According to this SNiP rule, it is necessary to check water heat supply and heating systems when turned off expansion vessels and boilers by hydrostatic pressure, equal to 1.5 working, but not less than 0.2 MPa in the lower part of the system.
The heating network is considered to have passed the test if it holds the test pressure for 5 minutes and does not drop by more than 0.02 MPa. In addition, there should be no leakage in heating equipment, welds, fittings, threaded connections and pipes.
Conditions for performing crimping
Test work is correctly carried out if all necessary requirements. For example, outside work cannot be carried out on the tested object, and the testing must be supervised by the shift supervisor.
Pressure testing is carried out only according to a program approved by the company’s chief engineer. It defines: procedure for employees and technological sequence of inspection. They also outline safety measures for the performed and ongoing work produced at adjacent facilities.
There should be no strangers during pressure testing of the heating system; there should be no turning on or off of testing devices; only employees taking part in the test remain on site.
When work is carried out in adjacent areas, it is imperative to provide reliable fencing and turn off the testing equipment.
Inspection heating devices and pipes are only allowed to be carried out at operating pressure values. When the heating system is pressure tested, reports are filled out to confirm the tightness.
Crimping procedure
This method of checking the heating system involves performing hydraulic tests:
- Heat exchangers;
- Boilers;
- Pipe
This makes it possible to identify leaks that indicate depressurization of the network.
Before testing the heating system with plugs, the heating system should be isolated from the water supply, visually assess the reliability of all connections, and also check the functionality and condition shut-off valves.
After this, the expansion tank and boiler are turned off to flush the radiators and pipelines from various deposits, debris and dust.
During the hydraulic test, the heating system is filled with water, but during air tests this is not done, but simply a compressor is connected to the drain valve. Then the pressure is increased to the required value, and its indicators are monitored with a pressure gauge. If there are no changes, then the tightness is good, therefore, the system can be put into operation.
When the pressure begins to decrease beyond the permissible value, this means there are defects. Leaks in a filled system are not difficult to find. But in order to identify damage during an air test, a soap solution should be applied to all joints and joints.
Air pressure testing takes at least 20 hours, and hydraulic testing takes 1 hour.
Having corrected the identified defects, the procedure is repeated again, and this has to be done until good tightness achieved. After carrying out this work, pressurization certificates for heating systems are filled out.
Checking the heating network with air is usually carried out if it is impossible to fill it with water, or when carrying out work in low temperature conditions, because the liquid can simply freeze.
Heating system pressure test certificate
This document displays the following information:
- What type of crimping method was used?
- The project in accordance with which the circuit was installed;
- The date of the inspection, the address where it was carried out, as well as the names of the citizens who sign the act. This is mainly the owner of the house, representatives of the repair and maintenance organization and heating networks;
- How the identified faults were eliminated;
- Test results;
- Are there any signs of leakage or leakage of threaded or welded joints. In addition, it is indicated whether there are drops on the surface of the fittings and pipes.
Permissible test pressure when testing water heating
Many developers are interested in what pressure should be used to check the heating system. In accordance with the requirements of SNiP presented above, when crimping, a pressure 1.5 times higher than the working pressure is allowed, but should not be less than 0.6 MPa.
There is another figure indicated in the “Rules” technical operation thermal power plants." Of course, this method is “softer”; its pressure exceeds the working pressure by 1.25 times.
In private houses equipped autonomous heating, it does not rise above 2 atmospheres, and it is adjusted artificially: if there is excess pressure, then the relief valve immediately turns on. Whereas in public and multi-apartment buildings working pressure much more than these values: five-story buildings - about 3-6 atmospheres, and tall buildings- approximately 7-10.
Heating system testing equipment
Most often, a pressure tester is used to perform a hydraulic test. It is connected to the circuit to regulate the pressure in the pipes.
Huge number local networks heating in private buildings does not require high pressure, therefore a manual crimper will suffice. In other cases, it is better to use an electric pump.
Hand-held devices for testing heating systems develop a force of up to 60 bar or more. Moreover, this is enough to check the integrity of the system even in a five-story building.
The main advantages of hand pumps:
- Reasonable cost, which makes them accessible to many consumers;
- Light weight and dimensions of hand presses. Such devices are convenient to use not only for personal purposes, but also for professional use;
- Long service life without failures or breakdowns. The device is so simply designed that there is nothing to break in it;
- Suitable for medium and small heating equipment.
Branched and large circuits on large areas, multi-storey buildings and production facilities are inspected only electrical appliances. They capable of pumping water under very high pressure, which is unattainable for manual devices. They are equipped with a self-priming pump.
Electric pumps develop force up to 500 bar. These units are usually built into the main line or connected to any opening. Basically, the hose is connected to a tap through which the pipe is filled with coolant.
Performing heating pressure testing is a very complex technological procedure. That’s why you shouldn’t do it yourself; it’s better to use the services of professional teams.
Like any other mechanism or structure, the heating system requires maintenance. Activities that keep it in working order are pressure testing and washing. To obtain results when carrying out these procedures, it is important to understand the technological process.
When is pressure testing carried out?
Pressure testing of the heating system involves a leak test. This event is necessary:
- at startup after installation is completed;
- when conducting repair work on a section of the contour;
- when carrying out scheduled maintenance work in preparation for the heating season.
Essentially, pressure testing is determining the level of tightness of the heating system. It consists of sequentially performing a number of operations:
- creating pressure by pumping water or air;
- Depressurization detection;
- identifying areas where liquid or air is leaving the system.
Modern designs do not require heating large number people to carry out such verification. Special equipment helps.
The presence of increased pressure will cause failure of devices and components in emergency areas. For elements located in in good condition, excess pressure will not have a negative effect.
Sequence of work
Pressure testing is carried out with the heating system turned off and the coolant removed from it. To prevent damage to the integrity of the pipeline, it is necessary to constantly monitor the pressure level.
Tests should be carried out taking into account the specific characteristics of the system and take into account:
- pipeline material parameters;
- quality indicators of fittings;
- number of storeys of the building;
- wiring diagram.
The sequence of actions when carrying out pressure testing is unified and is carried out in the following order:
- The part of the pipeline that is subject to inspection is disconnected. During autonomous heating, stop the boiler.
- Remove the coolant.
- The heating circuit is filled with water with a temperature below 45 degrees Celsius.
- As the pipeline fills, air is released.
- The system includes equipment for pressurizing.
- Increase the pressure to the value specified by the design as working. At the same time, visual monitoring of the system condition is carried out.
- Smoothly increase the pressure (this prerequisite) to the level specified by the test.
- Record the pressure value on the control pressure gauge.
- Maintain test pressure for 10 minutes.
- Visually inspect to detect obvious leaks, suspicious areas of connections and other faults. Check the functionality of the shut-off valves.
- Take pressure gauge readings. If no pressure drop is observed, the system is considered to have passed the test. If there are problems, they are eliminated and the procedure is repeated.
- Based on the results of the event, a report is drawn up.
Air testing is used when it is not possible to use water or carry out tests at low temperatures when there is a possibility of liquid freezing in the pipeline. When using the pneumatic test method, an indicator of circuit depressurization is a change in pressure readings on the pressure gauge. To identify emergency areas, areas that may have problems are covered with a soap solution.
System test pressure
To avoid emergency situation Pressure testing should be carried out in accordance with the requirements of SNiP. This standard provides for a pressure for testing that is 50% higher than the operating level, but not less than 0.6 MPa. Rules for the technical operation of thermal power plants recommend performing pressure testing in more mild conditions: with a pressure exceeding 25% higher than the working one, but not less than 0.2 MPa.
It is important to monitor your blood pressure Thus, operating pressure is the base value for testing. In houses with no more than three floors, the value is less than 2 atm. and is regulated by the operation of a check valve. In houses with a large number floors, this figure is higher and changes with increasing number of floors, and can reach 10 atm.
Regulatory documentation indicates that the test pressure is selected between maximum and minimum. The minimum value is taken to be 20-30% higher than the working one. The maximum value is determined by the project.
IN general case it is necessary to study the passport data of absolutely all devices and devices included in the heating system, so as not to harm them during testing.
Necessary tool
To create the required conditions during pressure testing, you need equipment that allows you to achieve the required pressure level. A pump is most often used. He, together with check valve connects using a hose high pressure to the system through a pipe. The main characteristics when choosing a device are the level of performance and the pressure it can create. If the device is powered by electricity, then pay attention to the operating voltage (220 V or 380 V).
Required Tools When carrying out work with a small volume of the circuit, it is advisable to use manual construction crimping machine, which is equipped with a hydraulic cylinder. Greater efficiency and ease of use can be achieved by using an electrically driven piston device. Electric type The crimper will create the required pressure in a short time without applying any muscular effort. These devices, in addition to the pressure gauge, have monitoring and control equipment.
In private houses where there is low pressure in the system, fill it with water and then record the pressure readings on the pressure gauge.
Who does the testing?
Responsibility for monitoring the performance of the heating system and carrying out preventive measures lies with the organization that operates it. Utility services deal with these issues in residential buildings, and at other enterprises and institutions - relevant technical services.
Certified specialists with the necessary qualifications are allowed to carry out pressure testing work.
It is important for specialists to have qualifications This work in private houses with autonomous heating is carried out by employees of service organizations or independently, as is installation.
Regardless of who will carry out the pressure testing activities, the requirements and rules should be adhered to regulatory documents regulating this type of work.
Pressure testing technology in an apartment building
The crimping procedure is carried out according to a single algorithm; the procedure has some peculiarities in different cases.
Special services are required to carry out hydraulic tests.
This event is also carried out after repair or when commissioning equipment.
The outcome of the event is documented and a corresponding act is drawn up.
Before crimping the following is carried out:
- inspection of the supply unit, pipeline and other parts of the system.
- checking the condition of the thermal insulation of the main line.
When used for more than 5 years, it is recommended to flush the system before hydraulic testing. For this purpose, a special solution is poured into the pipes freed from coolant.
Having completed these activities, they proceed to crimping. The actions are in the following order.
- Water is poured into the newly installed or flushed system.
- Using special injection equipment, they create high blood pressure, which is controlled by a pressure gauge.
- If the pressure level remains unchanged for 15-30 minutes, then this indicates the tightness of the system and the reliability of the equipment included in it.
- If a decrease in pressure is observed, the reason for this is determined.
- Having found out the place where the leak occurs, it is eliminated or replaced faulty element and the procedure is repeated.
- The test is considered successful if the pressure drops no more than 0.1 atm over 30 minutes.
Hydraulic testing technology in a private home
Since the pressure in closed autonomous heating systems is low, they use pumping equipment any type. It is possible to carry out the test by connecting the heating system to a water supply line in which the pressure level satisfies the conditions.
For powering tap water a drain tap or a tap specially installed for this purpose is used. They are located at the lowest point, which ensures free displacement of air.
The water temperature should not exceed 45 degrees Celsius. Simple designs Heating systems made in-house are tested without the involvement of third parties. The algorithm of actions does not differ from the sequence of work in multi-storey buildings.
When using test water as a coolant, its hardness level is important. The required indicator is 75-95 units. Doubts about the suitability of water may arise if scale forms on the surface after use. heating elements household appliances(electric kettle, washing machine, boiler).
If the water is not used in the future, it is drained. Immediately after this, it is necessary to fill the system with coolant. This is important when using steel pipes and metal heating devices that are not protected inside.
System testing Pneumatic crimping
Air for pressure testing is used quite rarely, most often when conducting tests in private homes. In this way, the quality of the system’s assembly is checked in the absence of water or related equipment.
For testing, a compressor equipped with a pressure gauge is connected to the supply or drain valve. In this case, the design of the pump and its drive do not play a role, the main thing is that its power is at a sufficient level. For safety reasons, excess pressure is not increased to more than 1.5 atm. Air valves in this case they are replaced with plugs.
The pressure holding time in the system is longer compared to the hydraulic test. This is due to the properties of gases, since stabilization of pressure in the circuit occurs slowly. Its value will initially inevitably decrease even with working equipment. After stabilizing the air pressure, the exposure should be more than half an hour.
Pneumatic crimping Despite the simplicity of the operations carried out during crimping, this is a responsible undertaking that it is advisable to entrust to a qualified specialist.
To ensure that the heating system does not fail at the most stressful moment and that the heating season passes without problems, it is necessary to periodically check the condition of the equipment and identify all worn parts. This test is called “pressure testing of the heating system”; it is carried out according to certain rules.
What is pressure testing of heating and water supply systems?
Heating and water supply are two systems consisting of a large number of varied equipment. As you know, the performance of any multicomponent system is determined by the weakest element - if it fails, it stops completely or partially. To identify all weak points, pressure testing of heating and water supply is carried out. If we talk in simple language, the pressure deliberately rises much higher than the working one, pumping liquid. This is done using special equipment; the pressure is controlled using a pressure gauge. The second name for crimping is hydraulic testing. It's probably clear why.
Heating pressure testing is carried out after any repair or before the heating season
When a heating system is pressure tested, the pressure is increased by 25-80% depending on the type of pipes, radiators, and other equipment. It is clear that such a test reveals all the weak points - everything that does not have a safety margin breaks, leaks appear in worn pipes and unreliable connections. Having eliminated all identified problems, we ensure the functionality of our heating or water supply for some time.
If we are talking about central heating, then pressure testing is usually carried out immediately after the end of the season. In this case, there is a decent period of time for repairs. But this is not the only case when such events are held. Pressure testing still takes place after repairs or replacement of any element. In principle, this is understandable - we need to check how reliable the new equipment and connections are. For example, you are heating. We need to check how high quality the connections are. This can be done using crimping.
If we talk about autonomous systems in private houses or apartments, a new or repaired water supply is usually checked by simply turning on the water, although even here a strength check would not hurt. But it is advisable to test the heating “to its fullest”, both before commissioning and after repairs. Keep in mind that those pipelines that are hidden in walls, floors or under suspended ceiling, must be tested before they are closed. Otherwise, if during testing it turns out that there are leaks there, you will have to disassemble/break everything and fix the problems. Few people will be happy about this.
Equipment and test frequency
Pressure testing of centralized systems is carried out by personnel using standard equipment, so it is hardly worth talking about. But not everyone probably knows about the costs of private heating and water supply. These are special pumps. There are two types - manual and electric (automatic). Manual pressure testing pumps are autonomous, the pressure is pumped up using a lever, and the created pressure is controlled using a pressure gauge built into the device. Such pumps can be used for small systems - pumping is quite difficult.
Electric pumps for pressure testing are more complex and expensive equipment. They usually have the ability to create a certain pressure. It is set by the operator, and it is “caught up” automatically. Such equipment is purchased by companies engaged in professional crimping.
According to SNiP, hydraulic testing of heating systems must be carried out annually, before the start of the heating season. This applies to private houses too, but few people comply with this standard. At best, they check it once every 5-7 years. If you are not going to test your heating annually, then there is no point in buying a pressure tester. The cheapest manual one costs about $150, and a good one costs from $250. In principle, you can rent it (usually from companies that sell components for heating systems or from offices that rent equipment). The amount will be small - you need the device for several hours. So this is a good solution.
Call specialists or do it yourself
If for some purpose you require a pressure test certificate for your heating or hot water supply system, you have only one option - order this service from a specialized organization. The cost of heating pressure testing can only be quoted to you individually. It depends on the volume of the system, its structure, the presence shut-off valves and their conditions. In general, the cost is calculated based on the tariff for 1 hour of work, and it ranges from 1000 rubles/hour to 2500 rubles/hour. You will have to call different organizations and inquire with them.
If you have upgraded your heating or hot water supply own home, and you know for sure that your pipes and equipment are in good condition, there are no salts or deposits in them, you can carry out pressure testing yourself. No one will demand hydraulic test certificates from you. Even if you see that your pipes and radiators are clogged, you can wash everything yourself and then test it again. If you just don’t want to do this, you can call specialists. They will immediately clean the system and pressure test it, and will also issue you a certificate.
Crimping process
Pressure testing of heating systems in a private home begins with disconnecting the heating boiler, automatic air vents and expansion tank. If there are shut-off valves leading to this equipment, you can close them, but if the valves turn out to be faulty, the expansion tank will definitely fail, and the boiler will fail, depending on the pressure that you apply to it. Therefore, it is better to remove the expansion tank, especially since this is not difficult to do, but in the case of a boiler you will have to rely on the serviceability of the taps. If there are thermostats on the radiators, it is also advisable to remove them - they are not designed for high pressure.
Sometimes not all heating is tested, but only some part. If possible, it is cut off using shut-off valves or temporary jumpers are installed - surges.
There are two important points: pressure testing can be carried out at an air temperature not lower than +5°C, the system is filled with water with a temperature not higher than +45°C.
As already mentioned, the testing pressure depends on the type of equipment and system being tested (heating or hot water supply). The recommendations of the Ministry of Energy set out in the “Rules for the technical operation of thermal power plants” (clause 9.2.13) are summarized in a table for ease of use.
| Type of equipment tested | Test pressure | Test duration | Allowed pressure drop |
|---|---|---|---|
| Elevator units, water heaters | 1 MPa(10 kgf/cm2) | 5 minutes | 0.02 MPa (0.2 kgf/cm2) |
| Systems with cast iron radiators | 0.6 MPa (6 kgf/cm2) | 5 minutes | 0.02 MPa (0.2 kgf/cm2) |
| Systems with panel and convector radiators | 1 MPa (10 kgf/cm2) | 15 minutes | 0.01 MPa (0.1 kgf/cm2) |
| Hot water supply systems made of metal pipes | 10 minutes | 0.05 MPa (0.5 kgf/cm2) | |
| Hot water supply systems from plastic pipes | operating pressure+ 0.5 MPa (5 kgf/cm2), but not more than 1 MPa (10 kgf/cm2) | 30 minutes | 0.06 MPa (0.6 kgf/cm2), with further testing for 2 hours and a maximum drop of 0.02 MPa (0.2 kgf/cm2) |
Please note that for testing heating and plumbing made of plastic pipes, the test pressure holding time is 30 minutes. If no deviations are detected during this time, the system is considered to have successfully passed the pressure test. But the test continues for another 2 hours. And during this time, the pressure drop in the system should not exceed the norm - 0.02 MPa (0.2 kgf/cm2).
On the other hand, SNIP 3.05.01-85 (clause 4.6) has other recommendations:
- Heating and water supply systems are tested at a pressure of 1.5 times the working pressure, but not lower than 0.2 MPa (2 kgf/cm2).
- The system is considered operational if after 5 minutes the pressure drop does not exceed 0.02 MPa (0.2 kgf/cm).
What standards to use is an interesting question. For now, both documents are valid and there is no certainty, so both are valid. It is necessary to approach each case individually, taking into account the maximum pressure for which its elements are designed. So working pressure cast iron radiators- no more than 6 Atm, respectively, the test pressure will be 9-10 Atm. It’s also worth deciding on all the other components in much the same way.
Air crimping
Not everywhere and not always is it possible to rent a crimping machine, just as it is not possible to buy one. For example, you need to test the heating in your dacha. The equipment is specific and the chances that someone you know has it is very low. In this case, pressure testing of the heating system is carried out with air. To pump it, you can use any compressor, even a car one. The pressure is monitored using a connected pressure gauge.
This type of crimping is less convenient and not entirely correct. Heating and plumbing are designed to transport liquids, which are much denser than air. Where water will not even ooze out, air will escape. Therefore, we can say with a high degree of confidence that you will have an air leak - somewhere there will be a loose connection. Moreover, it is difficult to determine the location of the leak during such testing. For this purpose, use a soap solution, which coats all joints and connections, all places where air can escape. Bubbles appear at the leak site. Sometimes you have to search for a long time. This is precisely why such pressure testing of the heating system is not very popular.
Pressure testing of a heated floor has its own characteristics - you must first check the comb and all the devices attached to it. To do this, close all the supply and return valves of the loops, filling only the heated floor manifold, and check it by increasing the pressure. Having reset it to normal, the loops of the heated floor are filled in turn, and only then is excess pressure created. The process is described in more detail in the video.
To check the tightness of its elements (pipes, radiators, expansion tank, etc.), their detachable and permanent connections (welds, flanges, etc.).
When and why is pressure testing of a heating system necessary?
Planned pressure testing is usually carried out after finishing and before starting. In the first case, in order to determine the degree of wear and location of damage to the system after a period of operation and eliminate shortcomings during the time when the heating will not work. In the second case, pressure testing is carried out to confirm the integrity of the system before the working season.
In addition, pressure testing is necessary after any type of work related to breaking the tightness of the system (sealing leaks, replacing elements) and before putting into operation a newly installed system.
It is better to entrust the initial pressure testing (when putting the heating system into operation) and hydraulic tests after a major overhaul to an organization specializing in such tests. Having experience in the work and the equipment necessary to carry out the work, specialists will carry out crimping more efficiently. In addition, based on the test results, a protocol will be drawn up, which will serve as documentary evidence of the serviceability of the system.
At the same time, situations arise when the system must be pressure tested on its own. This is quite possible provided that the rules for conducting such tests are followed.
What is required for self-pressure testing of the heating system?
To fill the heating system with water and achieve a certain pressure, you will need a pumping device. Testing organizations use special crimping machines (manual or) and hydraulic pumps for these purposes. The cost of such equipment is quite high, so if you do not plan to constantly carry out crimping yourself, you should use cheaper methods.
Most acceptable budget option may become a vibration pump. The model and method of water intake in this case are not of fundamental importance. With the upper and lower intake methods, filling the system and pressurizing is carried out in the same way. You can use pumps “Belamos”, “Cricket”, “Aquarius”, etc.
It is important that the pressure level in the system can be controlled, so you need to make sure in advance that the pressure gauge is working and accurate.
The pump can draw water from almost any container, periodically adding it as the liquid is pumped into the system. Required quantity water for filling and achieving the required pressure is calculated by summing up the volumes of all heating radiators and adding to the result 20% of the resulting amount (for filling the pipes).
Flushing the heating system is necessary when there is a possibility of debris getting inside the system during repairs or installation work. The presence of a large, educated small particles, determined by pressure drops when filling the system. The presence of a small amount of small debris - due to contamination of the water when draining the filled system. As a result of washing, the output should appear clean water, and when filling the system there should be no pressure drops.
Filling the heating system must be started from the lowest point (from the drain valve). In this case, the air will be gradually replaced by water and move from the bottom up, towards the air vents. If the system is equipped for air exhaust, there is no need to control the process.
If the system is old enough and requires manual “bleeding” of air, you should open the bleed valves and, gradually filling the system, wait until water appears from the bleed pipes, and then close the valves. Filling the system with water too quickly may result in the air not having time to completely move to the outlets. Water will appear from the pipes while air jams will “walk” through the system.
Sequence of actions when testing a heating system
For pressure testing, it is better to choose a period when the weather does not change. Temperature changes and changes atmospheric pressure may distort test results.
The condition of heating and water supply system pipelines must be checked periodically. This strength test - pressure testing - is regularly carried out by city municipal services. How should such pressure testing be carried out in a country cottage?
Crimping is a testing method hydraulic system(pipeline) by creating excess pressure in it that exceeds the working pressure. It's simple and convenient way, especially for complex, multi-component systems including pipes, fittings, radiators and other elements.
For testing, SNiP recommends using a pressure 1.5 times higher than the working pressure. For example, for a heating system country cottage, in which the pressure usually does not exceed 2-3 atm, pressure testing can be done by increasing the pressure to 3-4.5 atm.
For crimping in professional conditions use special electric pressure testing pumps, which, of course, are easy to use, but quite expensive (from 10 thousand rubles). Therefore, in cottages they often use manual pressure pumps costing several thousand rubles. Craftsmen also use household compressors for this.
There is only one requirement for the compressor: the pressure it pumps must be sufficient for testing.
Almost all models are suitable for pressure testing of cottage systems, since even household compressors usually provide an operating pressure of 6-8 atm. In this regard, manual crimpers are better, as they allow you to maintain pressure more accurately.
HOW CROSS TESTING IS CARRIED OUT
Before the test, turn off the heating, use taps to disconnect the heating boiler and pressure-sensitive elements (for example, reverse osmosis filters) from the system.
An important point - the pressure must be increased gradually to the calculated value, say within 1-2 minutes. After reaching the calculated value, the device pumping pressure is turned off, and the hydraulic line to which it is connected is closed with a ball valve.
The increased pressure is maintained in the system for 10-15 minutes. During this time it should not decrease. The system is then visually inspected for leaks. If the pressure does not drop and no leaks are detected, the pressure test is considered successful.
Expert opinion
Pressure testing of the heating system is carried out to check the proper operation of all elements. You don't need to do it often. In fact, crimping is done only in a few cases:
1) immediately after installing the heating system;
2) if some elements of the system were subjected to serious mechanical stress;
3) before the start of the heating season, when the system has been turned off for a long time.
For pressure testing in private homes, you can buy a small compressor. The pressure in the pipes of a cottage is usually low, so a compressor with low power is quite suitable. Just don’t forget that before pressurizing, you need to release any air that may accumulate in the pipes (for this, a special valve must be installed at the top point of the circuit).
If, based on the results of pressure testing, it was necessary to correct any defects, then after the repair you need to check the system again.
