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The results of comparing the pressure levels between American and Japanese standards are as follows:
CL15030040060090015002000250035004500
K-level 1020304565110140180250320< br/>
During the use of the Japanese standard flange, the sealing end surface must be clean, the reason is to avoid leakage. During the whole construction process, especially in the heavy oil system and the environment with catalyst dust, it is necessary to keep the sealing end face clean. The airtight manhole leaked on the sealing surface during the inspection and repair of the heavy-duty workshop. It was found that a small amount of catalyst was stuck on the gasket, which affected the operation of the entire device. Therefore, when the gasket is reassembled, the oil residue and its impurities on the sealing surface must be removed, and the sealing surface must be carefully inspected, and no radial scratches are allowed. The other is that there are indentations on the sealing surface of the Japanese standard flange, especially when the metal gasket and steel ring are used for sealing. The hardness of the flange and the gasket does not match, resulting in indentation on the flange sealing surface. Therefore, when replacing it , The hardness requirements must be given to avoid leaving indentations on the flange sealing surface, and the sealing can not lead to leakage.
