How to inspect the quality of the spheroidal graphite cast iron manhole cover? What is the specific inspection method? Let me give you a detailed introduction below. Inspection method for the well circle of ductile iron manhole cover.
1. Inspect the manhole cover: There is no doubt that it must be conducted strictly based on the relative inspection limits of the family.
2. Flatness inspection of ductile iron manhole cover: The time of ban can accept special mold inspection items.
3. The surface layer of ductile iron manhole cover: no obvious welding defects can be found, and the forging pattern is relatively clear.
4. Check the composition results of the ductile iron manhole cover. The ductile iron manhole cover of the overhaul port is not prone to oscillating and noise after being put into use. The distance between the manhole cover and the well frame should not exceed 1mm.
The above is about the quality inspection method of ductile iron manhole cover and circle.