Views: 9 Author: pqwt Publish Time: 2022-08-25 Origin: PQWT
Prefabricated direct buried hot water insulation pipe heat pipe leakage will cause energy waste, affect the heat users' heating, bring extra maintenance burden to the heating enterprise. Therefore, to solve the pipeline leakage must be prevented in advance, do a good job in advance of the pipeline leak detection work so the following I will take you to understand how the thermal pipeline waterproof leak repair.
1, thermal pipeline leakage causes and effects
There are many factors affecting the leakage of heat pipes, which can be broadly categorized as the following: bad quality of pipes and fittings; poor welding quality of joints; the impact of construction of other projects; high water pressure and water hammer damage; poor corrosion and insulation performance of pipelines; large traffic load caused by soil settlement; shallow pipeline burial layer and experience continuous low temperatures in winter; heating media led to corrosion inside the pipeline; not timely Inspection and repair as well as the use of pipelines over the age.
2. Leak detection of heat pipes
(1) Leak detection of water imbalance
Heat network is a closed loop system with pressure, in the normal operation of the process, the water volume in the heat network to maintain a constant. When there is a leak in the heat network, it is necessary to make up water; when there is water leaking into the heat network from the outside, it is necessary to release water to maintain the dynamic balance of water in the heat network.
(2) Leak detection for pressure abnormalities
The heat network can be regarded as a closed pressurized container. If there is a leak in the container, the pressure will be consistent with the pressure of the surrounding environment, and the rate of change of pressure depends on the internal volume of the container and the amount of leakage.
(3) temperature variation leak detection
Hot water pipeline leakage will cause the ground temperature above the leak point to rise, which will cause the leak point near the underground pipeline well chamber temperature rise. So you can find the leak on the pipe network through temperature changes.
(4) abnormal sound leak detection
When the leak occurs, the water ejected from the leak will rub against the leak under the action of the pressure of the pipe. The sound travels along the pipe to the nearby valve. At the same time, the water ejected onto the surrounding soil will also produce sound and travel through the soil to the ground.
Use pqwt pipe leak detector can effectively find the heat pipe leak leak point, in general, the basic detection method is, connect the leak detector host, headphones, sensors. Turn on the switch, put on the headset, place the sensor on the road above the pipe line, place it step by step according to the length of the pace, step by step to measure and listen, 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 the leak. Therefore, we use the leak detector, a single point in the leak signal is not meaningful, to multi-point repeatedly compare, compare 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, the larger point may instead be on the side of the road above the pipe, rather than being Pipeline above the road, so the location of the pipeline to know, in addition to the tee, bend, water pressure, burial depth, buried layer, etc. will have an impact on the detection to take these into account.
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