The welding requirements of heat conduction oil furnace are very strict, and the welded joints need to meet different requirements according to different compression components.
For the longitudinal ring weld of heat conduction oil furnace, sealing joint is 100% ray or 100% ultrasonic plus at least 25% ray inspection, and the current requirements of steam boiler and hot water boiler are basically the same, only add 100% ultrasonic plus at least 25% ray inspection. This regulation mainly considers 100% ultrasonic and 25% ray inspection, which can fully find the defects in the weld, meet the safety requirements and reduce the production cost.
For flaw detection of pipe butt joint on heating surface, the requirements are put forward according to different heating conditions. The difference in heat is radiant heat and convection heat. In the draft for consultation, 25 percent and 10 percent of flaw detection and spot checks are specified respectively. In the feedback, some units considered the requirements to be low and suggested changing them to 100% and 50%; Some organizations think the requirement could be lower. After analysis and research, we adopted the latter point of view, that is, not less than 10% of the radiation section of radiographic flaw detection and spot inspection; Not less than 5% in the convection section. The main consideration is that the butt weld of the heating surface tube should be gas shielded welding, and the quality is guaranteed. In addition, this procedure also stipulates the flaw detection method and the calculation of spot check rate, so that this procedure is more operable.
In addition to the cylinder of the gas phase furnace, the mechanical performance test should also be carried out. The cylinder of the liquid phase furnace, the heating surface tube of all the organic heat carrier furnace and the butt joint of the pipeline do not need to be carried out the mechanical performance test. Therefore, this regulation is only in the gas phase furnace batch production. In other cases, a test board is not required. The main consideration is the relatively low pressure of liquid phase furnace. At the same time, this regulation not only specifies the welding method, but also puts forward the requirements for the welding process evaluation, which can ensure the quality and performance of the weld.
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