How should the quality of finned tube be inspected? Generally speaking, finned tube is a kind of heat exchange tube. Its main function is to improve the heat transfer efficiency. Usually, by adding fins on the surface of the heat exchange tube, the outer surface area (or inner surface area) of the heat exchange tube is increased, so as to achieve the purpose of improving the heat transfer efficiency. The detection method of finned tube is unknown to us. Experts on finned tube network have no idea about it. There are two main ways of saying: 预埋检测翅片管的方法解析：
The method of embedded inspection of finned tube is analyzed.
(1) Double-finned pipes should be embedded in the pile diameter of 0.6-0.8 m, three finned pipes should be embedded in the pile diameter of 0.8-2.0 m, and four finned pipes should be embedded in the pile diameter of 2.0 m or more. According to the specific conditions of Chifeng Bridge, three finned pipes can be embedded in the pile foundation.
(2) Steel pipe, plastic pipe or steel bellows should be used for acoustic finned tubes, and their inner diameter should be 50-60 mm. The joint of the finned tube should be smooth transition, the finned tube mouth should be higher than 100 mm above the pile top, and the height of each finned tube mouth should be the same, the lower end of the tube should be closed, the upper end should be covered, there should be no foreign body in the finned tube, and the finned tube body should not be damaged.
(3) the finned tube can be welded or tied into the inner side of the steel bar, and the finned tubes should be parallel to each other.
Field inspection method for purchase finned tube
(1) determine the delay time t of the sonic monitor transmitting to the receiving system before field testing. And calculate the correction time of sound time.
(2) when measuring, the transmitting and receiving probes should synchronously rise or fall at the same elevation or maintain a fixed height difference.
(3) the measuring point distance is 40cm, and when it is found abnormal, it will be encrypted to 20cm..
(4) choose the appropriate transmit voltage and amplifier gain, and then remain unchanged during the test.
(5) display and record the time history curve of received signal in real time.
(6) The detection profiles of multiple finned tubes are composed of two finned tubes, and the detection of multiple finned tubes is completed separately.
(7) After each group of test tubes is completed, the test points should be sampled randomly and repeatedly for 10%, the relative standard deviation of sound time should not be greater than 5%, and the relative standard deviation of wave amplitude should not be greater than 10%.
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