• Categories:Domestic News
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• Time of issue:2022-10-24 14:27
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(Summary description)Gasket: during installation, ensure that the gasket is new, clean and dry, and check whether the gasket is defective and damaged; Old gaskets cannot be reused; Before installation, confirm that the gasket size and grade used are consistent with the flange identification. Flange: before installation, check whether the flange surface is damaged, such as scratches, nicks, mud, corrosion and burrs. If the depth of the dents and scratches that cross the water lines of the flange sealing surface radially exceeds 0.2mm, and the coverage exceeds half the width of the gasket sealing surface, the flange must be replaced or the sealing surface must be reworked and repaired; The bearing surface of the nut on the back of the flange shall be parallel and smooth; Check whether the flange is aligned, and the inspection method shall comply with the requirements of 6.2 pipeline installation in SH3501-2011. Bolts and nuts: check whether the bolts and nuts are used correctly according to the design requirements of equipment and pipes; The thread and contact surface shall be free of dirt, rust, double skin, nick, burr, debris and other external substances that may affect the torque during fastening; It is not allowed to repair bolts by welding or machining; After the flange is installed and fastened, at least two threads are exposed outside the nut; The bolts and nuts must be lubricated before use to make the bolts have low friction coefficient and improve the anti sliding wire and corrosion resistance of bolts and nuts; Stud threads, nut threads and contact surfaces must be degreased and dried before applying lubricating oil; Unified lubricating oil shall be properly used for bolt threads, nut threads, nut bearing surfaces, washers, and nut bearing surfaces on flanges; Use high temperature anti seize compound as required.