Pressure heating system: rules and regulations snip, act of pressing the heating system
To put the heating into operation, be sure to flush and pressurize the system. After completing this procedure, the act is completed, which confirms, that the installation of the heating network is done correctly. Employees authorized to perform this work are required to comply with all applicable regulations.
SNiP pressing rules
Standards for crimping the heating system are described in the following documents, like Snip 41-01-2003, and another 3.05.01–85.
Conditioning, ventilation and heating - SNiP 41-01-2003
It is possible to carry out hydraulic checks of water heating systems only at a positive temperature in the premises of the house. Besides, they are must withstand water pressure at least 0,6 MPa without damage to tightness and destruction.
During the test, the pressure must not be higher than the limit value for the heating devices installed in the system., pipelines and fittings.
Internal sanitary systems - 3.05.01-85
According to this SNiP rule it is necessary to carry out check of water systems of heat supply and heating at switched off expansion vessels and boilers by hydrostatic pressure, equal 1,5 working, but no less 0,2 MPa at the bottom of the system.
It is considered, that the heating network has been tested, if it lasts 5 minutes under test pressure and will not fall more than 0,02 MPa. in addition, there should be no leaks in the heating equipment, welds, fittings, threaded connections and pipes.
Conditions for crimping
The test work is performed correctly, if all the necessary requirements are met. Example, third-party work may not be performed on the test object, and the test must be led by the shift supervisor.
Crimping is carried out only according to the program, approved by the company's chief engineer. It determines: the order of actions of employees and the technological sequence of the inspection. Safety measures of performed and current works are also taught, produced at adjacent facilities.
Strangers while pressing the heating system, test devices must not be switched on or off, only employees remain in place, participating in the inspection.
When carrying out work on adjacent sites, it is essential to provide reliable fencing and disconnection of test equipment.
Inspection of heaters and pipes is allowed only at operating pressure values. When the heating system will be crimped, acts fill, to confirm tightness.
Crimping procedure
This method of testing the heating system involves the implementation of hydraulic tests:
- Heat exchangers;
- Boilers;
- Pipes.
Thus it is possible to detect leaks, which indicate the depressurization of the network.
Before testing the heating system with plugs, the heat supply system should be isolated from the water supply, visually assess the reliability of all connections, and also to check up serviceability and a condition of shut-off valves.
After that the expansion tank and a copper for washing of radiators are switched off, pipelines from various deposits, garbage and dust.
In the process of hydraulic inspection, the heating system is filled with water, but do not do this when performing air tests, and simply connect the compressor to the drain cock. Then increase the pressure to the desired value, and a manometer to monitor its performance. If there are no changes, then the tightness is good, so, the system can be commissioned.
When the pressure starts to drop above the allowable value, means, defects are present. Leaks in a filled system are easy to find. And here, to detect damage during the air test, a soap solution should be applied to all joints and joints.
On performance of air crimping goes not less 20 hours, and for hydraulic testing - 1 year.
Correcting the detected defects, the procedure is repeated again, and it is necessary to do it, until it is good tightness is achieved. After carrying out these works, the acts of crimping heating systems are filled in.
Check of a heating network by air, usually, carried out, if it is impossible to fill it with water or when working in low temperatures, because the liquid can just freeze.
Act of pressing the heating system
This document displays the following information:
- What exactly is the method of pressing;
- Project, according to which the installation of the circuit;
- Date of inspection, the address of its holding, as well as the names of citizens, who sign the act. Basically it's the owner of the house, representatives of the repair and maintenance organization and heating networks;
- How the revealed malfunctions were eliminated;
- Test results;
- There are signs of leaks or unreliability of threaded and welded joints. exept this, is indicated, whether there are drops on the surface of fittings and pipes.
Permissible test pressure when crimping water heating
Many developers are interested, under what pressure it is necessary to carry out check of heating system. In accordance with the requirements of SNiP, presented above, when crimping the pressure above the worker is allowed 1,5 times, but be less 0,6 MPa should not.
There is another figure, specified in the "Rules of technical operation of thermal power plants". Of course, this method is "softer", in it the pressure exceeds the working in 1,25 times.
In private homes, equipped with autonomous heating, it does not rise higher 2 atmospheres, and is adjusted artificially: if excessive pressure occurs, then the drain valve is switched on immediately. Whereas in public and apartment buildings the working pressure is much higher than these values: five-storey buildings - about 3-6 atmospheres, and tall buildings - about 7-10.
Heating system test equipment
Most often, a press is used to perform hydraulic testing. It is connected to the circuit, to regulate the pressure in the pipes.
A huge number of local heating networks in private buildings do not require high pressure, so a manual crimper will suffice. In other cases it is better to use an electric pump.
Hand-held devices for testing heating systems are developing efforts to 60 bar and more. And this is enough to check the integrity of the system, even in a five-story building.
The main advantages of hand pumps:
- Reasonable price, making 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 operation;
- Long service life without failures and breakdowns. The device is so simple, that there is nothing to break in it;
- Suitable for medium and small heating equipment.
Branched and large schemes in large areas, high-rise buildings and production facilities are inspected only by electrical appliances. They able to pump water under very high pressure, which is unattainable for hand-held devices. Equip them with a weighted pump.
Electric pumps develop effort to 500 there is. These units, usually, built into the highway or connected to any hole. Basically connect the hose to the tap, through which the coolant was filled with pipe.
Heating crimping is a very complex technological procedure. That is why it should not be done with your own hands, it is better to use the services of professional teams.
