Common Methods for Gas Leak Detection and Location Common Methods for Gas Leak Detection and Location (1) Drilling Inspection Method: A diameter of 20 to 50 mm and a depth of 10 to 30 are drilled at intervals of 10 m above the underground gas pipeline. For the hole of the old m, the gas concentration in the hole is measured by a probe such as a cone type, a pumping type or a cart type.
(2) Leak detection method: use soapy water and other leak detection liquids to change the exposed pipelines, closed doors, flanges and welds, etc., leaking and leaking, and will bubble up at the leak point, and continue to grow. . This method is not suitable for low temperature climates below 5 °C.
(3) Pressure method: close the valve at both ends of the pipeline and check the pressure of the pipe network. If the pressure drops rapidly, it indicates that the pipeline has leakage. Then through the segmentation test and press, it is advisable to find the leak point.
(4) Adding odor method: Participate in the chemical odorant such as trace PTFE, and use the odor to find the leak point.
(5) Ultrasonic testing method: The ultrasonic pulse reflection principle is used to measure the thickness of the steel pipe wall after corrosion, and the thick wall of the large diameter pipe is accurately detected. The internal and external wall corrosion of the pipeline, the deformation of the pipeline, the stress corrosion cracking and the defects in the former wall, such as slag inclusion, are then investigated and leaked and positioned.
(6) Hydrogen tracer method: Participate in a small amount of hydrogen in the pipeline, and use the sensitivity of hydrogen to select a professional probe to detect the leak point. This method is mostly applied to artificial gas detection and small leak detection of small diameter.
(7) Electronic marker method: submersible marker, through the probe to intermittently send a certain frequency signal, can quickly and accurately find the location, and can know the pipeline situation according to the GIs system, such as the bend of the pipeline, the slope of the dead and the gas There are no other pipelines or underground space around the pipeline to avoid unnecessary troubles during the excavation. The principle of the electronic marker method is shown in Figure 6-13.
(8) In-tube intelligent climbing method: Using vanadium climbing (intelligent robot) to detect the pressure, flow, temperature and the degree of wall in the tube, after disposing the data recorded in the crawler, it can distinguish whether the pipeline is leaking. Zaoqiang County Tengda Gas Pressure Regulator Co., Ltd. gas regulator customer centering.
(Source: Hebei Zhenxing Gas Regulator Co., Ltd. gas pressure regulator http://)
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