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hi friends welcome to technical studies in this video i will show you the sequence of nut bolt tightening on flanges before starting the tightening let me show you how to load the gasket and the stud bolts clean the face of the flange but donamp;#39;t use abrasive tools check bolts threads are in good condition apply an approved lubricant on the bolts put two numbers bolts in the adjacent bottom side holes put the gasket between the flanges now the gasket sits eccentrically between the flanges we need the gasket sits exactly in the center of the flanges put the remaining bolts as per the shown sequence use a liver bar to align the holes and the outer face of the flanges now lift the gasket to its position you can use a piece of a welding roth now tight the bolts only enough to hold the gasket in its correct location check the flange overlap minimum at four quarters in case there is an overlap distribute equally to all sides let us tighten a pair of flanges with four bolts draw rough l