Underground pipe non-destructive leak detection method

Many times there are encountered underground water pipe leaks, but can not determine exactly which place is leaking, can not find the cause, in fact, we just need to learn how to find the leak is good to solve the problem, so how can we detect the location of underground leaks?

1. Pressure gas method

Use the pressure gas method to find leaks. The pressure head for pressurized gas is installed at the leak location, and the tracer gas is delivered in the direction opposite to the water intrusion. A detector is used to detect the leak of the tracer gas to determine the point where rainwater intrudes into the roof.

2. Listening method

Use Puch underground water detection can be effective in finding out the leak, in general, the basic detection method is that, connect underground water detection good host, headphones, sensors. Turn on the underground water detection switch, wear headphones, the sensor placed on the road above the pipeline, placed step by step according to the length of the pace, step by step listening, the closer to the leak, the stronger the signal, the farther away from the leak the weaker the signal, by comparing the signal strength between different points to achieve the purpose of detecting leaks. Therefore, we use underground water detection, a single point to listen to the leak signal is not meaningful, to multi-point repeatedly compared, compared to the sound vibration of the larger place is the leak, of course, we have to consider many other additional factors, such as the direction of the leak breakage mouth, because the pipe is round, if the side of the leak, may The larger point is instead on the side of the road above the pipe, rather than being above the road above the pipe, so the location of the pipe line should be known, in addition to the tee, bend, water pressure, burial depth, burial layer, etc. will have an impact, the detection should take these into account.

3. Roof humidity detector

The basic working principle of the instrument consists of a battery-powered device that generates a low-frequency electronic signal that is transmitted to the test material through the embedded rubber electrode pad behind one of the two electrodes, and the other electrode receives the signal sent by the test material, and the strength of the received signal changes with the change in the humidity of the test material. By moving the device over the roof surface, any areas containing moisture can be easily identified. Even if water has penetrated the structure of the building and the water source is far from the initial test point, the instrument can track the water source from the general area.

4. Tracer mass method

The essence of the tracer mass method is to inject or press a tracer gas or liquid into the leak site. By tracing the flow of the tracer mass, the leak path is identified and the source of the leak is found. If the gas injection method involves installing a gas supply nozzle at the leak location, the tracer gas is pressed through the gas supply nozzle into the leak outlet and the tracer gas will then diffuse along the leak path to identify the leak location. The device consists of a gas supply section and a gas detection section: the gas supply section consists of an air compressor, a pressure regulator, a flow meter, a tracer gas container, etc. The gas supply section consists of a Freon gas detector and a booster for forced attraction. The device has an accuracy of more than 70% and is available in a lighter version. There is also a detection method in which a detection liquid containing a luminescent substance is injected from the suspected part of the leak and illuminated with a UV lamp after a certain period of time and the part of the detection liquid that has leaked out will glow so that the source of the leak can be identified. This method is mainly used to find the source of leaks in roofing projects.

5. Electromagnetic wave detection

Electromagnetic wave detection method is mainly the use of electromagnetic waves can effectively penetrate the medium of most properties. Concrete is insulated when dry, affecting the propagation of electromagnetic waves, while wet concrete is a conductor, conductor conducive to the transmission of electromagnetic waves, so electromagnetic waves will penetrate the building works, if encountered in a dry place, the electromagnetic energy received is small, if encountered in a wet leak, is to receive strong electromagnetic waves. Electromagnetic wave detection technology can be used to detect leaks in construction projects.

6. Infrared temperature measurement

Some advanced foreign countries have used infrared thermometry to find leaks. When the roof leaks, the temperature of the leaky part and the leaky part will be different. Using infrared imaging equipment, the temperature difference is formed into a visual image and displayed on the monitoring screen to determine the location of the rainwater intrusion, the method can accurately determine the distribution of roof leaks.