How to test the quality of finned tube?

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The finned tube is heat exchange tube. The main function is to improve the heat exchange efficiency. Usually, to add fin to the surface of the heat exchange tube is to increase the outer surface area (or inner surface area) of the heat exchange tube. For the purpose of heat exchange efficiency. There are two main methods for detecting finned tubes, Murphy explains as follows:
Detection method of embedded detection tube
Two pipes shall be buried for the pile diameter of 0.6-0.8m; three pipes shall be buried for the pile diameter of 0.8-2.0m; four pipes shall be buried for the pile diameter above 2.0m. According to the specific situation of Chifeng bridge, three pipes can be buried for the pile foundation.
 Steel pipe, plastic pipe or steel corrugated pipe shall be used as acoustic detection pipe, and its inner diameter shall be 50-60mm. The joint of inspection pipe shall be smooth transition, the pipe orifice shall be more than 100mm higher than the pile top, and the height of each inspection pipe orifice shall be the same, the lower end of the pipe shall be closed, the upper end shall be capped, there shall be no foreign matters in the pipe, and the pipe body shall not be damaged.
https://szmurphy.en.alibaba.com/product/62419157392-811592052/Murphy_Copper_boiler_laser_welding_heat_exchanger_Laser_Welded_Finned_Tubes_heat_exchange_for_Solar_Water_Heating.html?spm=a2700.icbuShop.41413.31.298c6a21Pr1iAi

https://szmurphy.en.alibaba.com/product/62419157392-811592052/Murphy_Copper_boiler_laser_welding_heat_exchanger_Laser_Welded_Finned_Tubes_heat_exchange_for_Solar_Water_Heating.html?spm=a2700.icbuShop.41413.31.298c6a21Pr1iAi

The inspection pipe can be welded or tied on the inner side of the reinforcement, and the inspection pipes shall be parallel to each other.
Field test method
Before on-site detection, the delay time t from the acoustic monitor to the receiving system shall be measured. And calculate the sound time correction value.
During the measurement, the transmitting and receiving probes shall rise and fall synchronously at the same elevation or maintain a fixed elevation difference.
The distance between measuring points is 40cm, and it will be densified to 20cm when any abnormality is found.
Select the appropriate transmit voltage and amplifier gain, and keep the same during the retest.
 Display and record the time history curve of received signal in real time.
The multiple finned tubes are combined with two detection sections to complete the detection of multiple sections.
 After test, the test points shall be randomly sampled and tested for 10%, and the relative standard deviation of sound time shall not be greater than 5%; the relative standard deviation of amplitude shall not be greater than 10%.

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