Selection requirements and heat transfer effect of laser welded finned tubes

August 04, 2022

Selection requirements and heat transfer effect of Laser Welded Finned Tubes

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During the inspection of laser welded Finned Tubes, it is necessary to check whether there are deposits, coking, rust layers and other scales attached to them, and clean them immediately. At the same time, it is also necessary to check whether the adhesion between each Finned Tube and the rubber gasket is tight, and whether the rubber gasket itself is intact, so as to avoid leakage caused by rubber gasket degumming and damage.

For laser welding of finned tube compression nuts and upper and lower guide rods, always use force and grease for lubrication. Each instrument shall be adjusted by a specially assigned person and operated and maintained in strict accordance with the operating procedures. Each time the finned tube is compacted again, pay attention to the scale position of the last compression, and do not over press the rubber gasket, so as to reduce the service life of the gasket.

When replacing the rubber gasket of the finned tube, all the sections must be updated to avoid uneven gaps between the fins, which will affect the heat transfer effect.

Double pipes shall be buried when the pile diameter is 0.6-0.8m; Three pipes shall be buried with a pile diameter of 0.8-2.0m; Four pipes should be buried above the pile diameter of 2.0m. According to the specific situation of Chifeng bridge, three pipes can be buried in the pile foundation. Steel pipe, plastic pipe or steel corrugated pipe should be used for acoustic detection, and its inner diameter should be 50 ~ 60mm. The connection of the detection pipe should be smooth transition, the pipe orifice should be more than 100mm higher than the pile top, and the height of each detection pipe orifice should be consistent. The lower end of the pipe should be closed, the upper end should be covered, there should be no foreign matters in the pipe, and the pipe body should not be damaged.

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Before the on-site inspection of laser welded finned tubes, the delay time t from the emission of the acoustic detector to the receiving system shall be measured. And calculate the sound time correction value. During 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 encrypted to 20cm when abnormal conditions are found.

The proper emission voltage and amplifier gain are selected for laser welded finned tubes, and remain unchanged during retesting. Display and record the time history curve of the received signal in real time. Take two finned tubes as a detection profile for full combination, and complete the detection of multiple profiles respectively.

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