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summary: The heating steam pipe in the heavy oil tank is leaking during use. If ordinary welding is used to repair the leak, the construction process will be more complicated. This article introduces the use of mechanical methods for leak repair, which is easy to operate and achieves good results and economic benefits. keywords: Weld slag inclusion, repair, mechanical method The steam pipe used for heating in a heavy oil tank installed by our unit was found to be leaking during use. The steam pipe is an ordinary seamless steel pipe with a working pressure of 0.8Mpa (as shown in the figure). After inspection, it was confirmed that the cause was a welding slag inclusion in the weld at the head blind plate of the heating steam pipeline. It is estimated that the slag inclusion slipped out when the pipeline was in working condition, causing the pipeline to leak. Now that the oil tank is filled with heavy oil, if welding is used to repair leaks directly, the oil tank needs to be drained and cleaned, the oil tank needs to be replaced with gas, and sampling and testing are required. The operation process is very complicated. If mechanical leakage repairing method is used to repair welding blisters, the purpose of radical leakage can also be achieved. The quality should be similar to that of welding leakage repairing. The specific method is as follows: 1. Clean the area around the weld slag, and use a copper wire brush to thoroughly clean up the remaining slag. Then put the lead bar on the slag inclusion, and use the copper rod as a hammer to slowly hammer the lead bar so that the lead bar gradually penetrates into the slag inclusion. Then use an iron chisel to hold around the slag inclusion and hammer it with a copper rod to completely close the opening of the slag inclusion hole to prevent the infiltrated lead from sliding out again under the pressure in the pipe. The iron chisel club head should be surrounded by refractory mud to prevent sparks. 2. Put a piece of DN100 flange on the steam pipe, and use a 6mm steel plate to make a hoop to clamp on the pipe. See the picture below for details: 3. Slowly file the welding seam smooth with a rough oil stone. 4. Use a piece of DN100 flange to weld the steel plate, press the flange with the steel plate on the blind flange of the pipe, add asbestos rubber plate as filler, clamp it front and back with the flange on the pipe in the hoop, and tighten it with 4 M16 stud bolts, thus forming a double insurance for leak repair. 5. After completing the above, perform a water pressure test of 1.2Mpa on the steam pipeline to check if it passes the test. :$ The attachment cannot be uploaded due to school nights, and the view section cannot be seen by friends who want to know more about this aspect, I'm sorry!