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Do You Install Gaskets Correctly?
Posted: 11/27/2017 09:12:48  Hits: 13
Gaskets are very common spare parts for equipment. Do you install gaskets correctly? If they are not installed correctly, they will be damaged or there will even be danger when the equipment is running.

What tools should we prepare before installing a gasket?
The tools we should prepare: Calibrated torque wrenches, hydraulic tightened wrenches or other tightened tools, wire brushes(brass brushes are better), helmets, goggles, lubricants and other tools required by the factory.

Cleaning and tightening fasteners require a variety of specific tools. In addition, we must use standard installation equipment and conform to safe operation.

Installation steps
1. Checking and cleaning up
Remove all foreign matters and debris on the seal face of gaskets, various fasteners such as bolts and studs, nuts and gaskets. Check whether there are burrs, cracks and other defects on fasteners, nuts and gaskets or not. Check whether there are warps and deformation, radial scratches and deep marks hit by tools on the flange surface or not. If you find any part that is defective, it should be replaced in time. If you have any doubt, you need to contact the seal manufacturer timely.

2. Adjusting flanges
Adjusting the flange to align the bolt hole.

3. Installing gaskets
Confirm that the gasket conforms to the specified dimension and the specified material. Inspect the gasket to ensure that there are no defects. Carefully place a gasket between two flanges, and make sure that the gasket is in the middle of two flanges. Don't use an adhesive or anti-adhesive unless they are required by the installation instruction of gaskets. Align the flange, and ensure that the gasket is not stabbed or scratched.

4. Lubricating the bearing force surface 
Lubricating the bearing force surface only allows to use specified or approved lubricants. Apply enough lubricants on the bearing force surface of all threads, nuts and gaskets. Ensure that lubricants do not contaminate the surface of the flange or gasket.

5. Installing and tightening the bolt
Always use the correct tool. Use a calibrated torque wrench or other tightening tools that can control functions. Consult the technical department of the sealing manufacturer about requirements and regulations of the torque wrench.

Steps of tightening the nut are as the following.
The first step: Manually tighten all the nuts for the first time, and the bigger nut can be tightened with the help of a small wrench.
The second step: Tighten each nut to obtain approximately 30% of the required full torque.
The third step: Tighten each nut to obtain approximately 60% of the total required torque. 
The fourth step: Tighten each nut again to obtain 100% of the required total torque.
It should be noted that flanges with large diameters can follow the above steps more times.
The fifth step: Tighten all the nuts one by one in the clockwise direction at least once to get the full required torque.

6. Tightening the bolt again
Consult the technical department of the seal manufacturer about guidance and advice on tightening bolts again. Non-asbestos gaskets and gaskets containing rubber composition which are used at high temperatures can not be tightened again except for specified requirements. Fasteners under corrosive thermal cycles need to be tightened again. The tightening operation should be performed at ambient temperature and atmospheric pressure.


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