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DONDE SEAL

CHINA

Professional Of Mechanical Packing & Industrial Gasket

6.Torque bolts in a minimum of four stages as listed in Steps 7, 8, 9, and 10 below.

7.   7.Torque the bolts up to a maximum of thirty percent of the final torque value required following the sequence recommended. (See charts for bolting sequence.) Number bolts so that torquing requirements can be followed. With any gasket material, it is extremely important to follow a proper bolting sequence. If this sequence is not followed, the flanges can be cocked. Then, regardless of the amount of subsequent torquing, they cannot be brought back parallel. This problem, of course, is maximized on metallic gaskets more so than on nonmetallic.

8.   8.Repeat step 7, increasing the torque to approximately 60 percent of the final torque required.

9.   9.Repeat step 8, increasing the torque to the final torque value.

1   10.On high-pressure, high-temperature applications, it is suggested that the flanges be retightened to the required stress after 24 hours at operating pressures and temperatures to compensate for any relaxation or creep that may have occurred. >>The End

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