Precautions for cleaning composite manhole covers. With the continuous construction of the city, the city is also developing rapidly, and the application of manhole covers is also changing accordingly. Among them, composite manhole covers are favored by the majority of users and are widely used, but in manhole covers During the long-term use, it is easy to be contaminated with a lot of dirt. In order to ensure the efficiency of use, it is usually necessary to clean the manhole cover, and the precautions for cleaning are as follows.
Composite manhole cover castings are often produced in places with dust, and there is often a lot of dust in the air, which constantly falls on the surface of the equipment. They can be removed with water or alkaline solutions. Adhesive grime, however, requires high-pressure water or steam to remove. Free iron on the surface will rust and corrode stainless steel. Therefore, be sure to clear. The floating powder can generally be removed together with the dust. Some are very sticky and must be treated as embedded iron. In addition to dust, there are many sources of surface iron, including cleaning with ordinary carbon steel wire brushes and shot blasting with sand, glass beads or other abrasives previously used on ordinary carbon steel, low alloy steel or iron castings, or Grinding of the aforementioned non-stainless steel products in the vicinity of stainless steel components and equipment. If the stainless steel is not protected during the blanking or lifting process, the iron on the wire rope, spreader and work surface can easily embed or stain the surface.
Scratches and other rough surfaces must be mechanically cleaned to prevent buildup of process lubricants or product or dirt. Grinding and machining both result in a rough surface with defects such as grooves, laps and burrs. Each defect may also damage the metal surface to such a depth that the damaged metal surface cannot be cleaned by pickling, electropolishing or shot blasting. The rough surface can become the source of corrosion and deposition products. Before re-welding, it is not possible to use coarse grinding to clean up weld defects or remove excess weld reinforcement. It should be ground with fine abrasives. Rust can sometimes be seen on stainless steel products or equipment before or during fabrication, indicating that the surface is heavily contaminated. Rust must be removed before equipment is put into service, and thoroughly cleaned surfaces should be inspected by iron test or water test.
In short, strict compliance with the precautions for composite manhole covers can effectively improve the use efficiency of manhole covers while ensuring the degree of manhole cover cleaning. At the same time, it is very important to do a good job in the corresponding maintenance work during the use of manhole covers.
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