Inspection standard of plate flange
All edges shall be blunt. On the working surface of plate flange with accuracy grade lower than "00", the sand hole with diameter less than 15mm can be blocked with the same material, and its hardness should be lower than that of surrounding materials. There should be no more than four blocked parts on the working surface, and the distance between them should not be less than 80mm. Those exceeding this requirement shall be scrapped.
The opposite two sides of the plate flange shall be provided with threaded holes or cylindrical holes for installing handles, lifting rings and other lifting facilities. When designing the lifting position, it shall be considered to minimize the changes caused by lifting. The design of lifting space shall meet the installation requirements, and the design shall be reasonable, easy to use and beautiful.
According to the user's requirements, after the threaded holes or grooves are set on the working surface of the plate flange, these parts should not have bulges higher than the working surface. For example, after the spliced plate flange is spliced and formed, the grooves shall be aligned with each other, and there shall be no high or low phenomenon.
The plate flange shall be made of fine gray cast iron or alloy cast iron. The casting process is divided into clay sand casting, cement sand casting and resin sand casting. The casting process can be determined according to the needs of customers and the use of plates.
The hardness of the working surface of plate flange shall be HB 170-220.
The scraping process shall be adopted for the working surface of plate flange, and the planing process can also be adopted for the "3" flat working surface. The surface roughness of the planing working surface shall not be greater than 5um according to the arithmetic mean deviation Ra of the contour
