How to install gaskets correctly?

Gaskets are very common parts for equipment. Do you install gaskets correctly? If they are not installed correctly, are going to damaged or there may also be danger in the event the products are running.

What tools should we prepare before installing a gasket?

The equipment we ought to prepare: Calibrated torque wrenches, hydraulic tightened wrenches and other tightened tools, wire brushes(brass brushes be more effective), helmets, goggles, lubricants and other tools necessary for factory.

Cleaning and tightening fasteners require a variety of specific tools. In addition, we’ve got to use standard installation equipment and mould to safe operation.

Installation steps

1. Checking and clearing up

Remove all foreign matters and debris around the seal face of gaskets, various fasteners for example bolts and studs, nuts and gaskets. Check whether you’ll find burrs, cracks and other defects on fasteners, nuts and gaskets or not. Check whether you will find warps and deformation, radial scratches and deep marks hit by tools on the flange surface or otherwise not. If you find any section which is defective, it ought to be replaced soon enough. For those who 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

State that the gasket conforms to the specified dimension and also the specified material. Inspect the gasket to ensure there are no defects. Carefully convey a gasket between two flanges, and be sure the gasket is in the heart of two flanges. Avoid an adhesive or anti-adhesive unless they are needed by the installation instruction of gaskets. Align the flange, and ensure that the gasket isn’t stabbed or scratched.

4. Lubricating the bearing force surface

Lubricating the bearing force surface only allows to make use of specified or approved lubricants. Apply enough lubricants for the bearing force surface of all threads, nuts and gaskets. Be sure that lubricants tend not to contaminate the top flange or gasket.

5. Installing and tightening the bolt

Only use the proper tool. Utilize a calibrated torque wrench or another tightening tools that can control functions. Consult the technical department of the sealing manufacturer about requirements and regulations in the torque wrench.

Steps of tightening the nut are because the following.

The initial step: Manually tighten each of the nuts the very first time, and also the bigger nut can be tightened by making use of a smaller wrench.

The other step: Tighten each nut to acquire approximately 30% from the required full torque.

Another step: Tighten each nut to acquire approximately 60% from the total required torque.

Your fourth step: Tighten each nut again to get 100% in the required total torque.

It ought to be noted that flanges with large diameters can keep to the above steps more times.

The 5th step: Tighten each of the nuts one by one inside the clockwise direction at least to find the full required torque.

6. Tightening the bolt again

Consult the technical department with 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’t be tightened again aside from specified requirements. Fasteners under corrosive thermal cycles must be tightened again. The tightening operation should be performed at ambient temperature and atmospheric pressure.
Source: China Gaskets Manufacturer – Yaang Pipe Industry (

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