某些装有易熔塞、安全阀的小型容器或有毒介质的压力容器,在焊后必须清除容器内部的杂物。如:单面焊双面成型焊缝背面的熔渣、铁锈、尘土和水压试验后的局部积水等。由于小型压力容器一般部没有较大开孔(如人孔),有的只有一、二个公称直径为15或25毫米的法兰管口,所以,清除 Some pressure vessels with fusible plugs, safety valves, small containers or toxic media must be cleaned after welding to remove debris from inside the container. Such as: single-sided welding double-sided weld on the back of the slag, rust, dust and hydrostatic pressure after the test of local water. As small pressure vessels generally do not have large openings (such as manholes), and some have only one or two flanged nozzles with a nominal diameter of 15 or 25 mm, clearance