Expansion gaskets, used to provide sealing between pipelines, pressure tanks, and various process equipment, protect the system against high pressure, sudden temperature changes, vibration, and mechanical movements. Thus, they increase both safety and operational efficiency. The sustainability of this performance depends on the assembly and disassembly operations being carried out with the correct methods. Errors made during application can lead to leaks, premature deformation, equipment damage, and production losses. Enermak has explained the critical points to be considered in the assembly and disassembly of expansion gaskets in detail.
What Should Be Considered During the Assembly of Expansion Gaskets?
In the assembly of expansion gaskets; selecting the appropriate product, correct surface preparation, proper placement and alignment of the gasket, and tightening the bolts to the specified torque values (the measure of the rotational force applied when tightening a bolt or nut) are of great importance.
Correct Gasket Selection: The most critical stage of the assembly process is selecting the gasket that fully complies with the system requirements. Choosing the wrong material or size will lead to a loss of performance in the long run, no matter how correctly the assembly is performed. The basic parameters to consider in gasket selection are:
- Operating pressure,
- Minimum and maximum temperature values,
- Chemical composition and corrosive properties of the fluid,
- The amount of vibration and axial/radial movement occurring in the system.
A gasket that does not meet these criteria may lose its sealing property in a short time, undergo deformation, and risk the safety of the system. Therefore, manufacturer technical data and engineering calculations must be evaluated during the selection phase.
Surface Preparation: Before assembly, flange surfaces and the gasket seat must be checked. Care should be taken regarding the following points:
- Dirt, oil, and rust residues must be completely cleaned,
- Surfaces must be free of burrs, scratches, or deformations,
- Contact surfaces must be smooth and even.
Inadequate surface preparation can cause the gasket to not seat correctly and lead to leaks under pressure. Therefore, surface preparation is one of the most sensitive steps of assembly.
Correct Placement and Alignment: During assembly, the gasket must be placed without kinking, bending, or shifting from the center. A misaligned gasket prevents the pressure from being distributed evenly across the gasket and can pave the way for premature deformation and wear. For this reason, correct alignment is indispensable for the long-lasting and safe operation of the gasket.
Torque Control of Bolts: Bolts must be tightened in accordance with the torque values specified by the manufacturer. If correct torque is not applied, certain problems may arise:
- Over-tightening (gasket deformation and crushing),
- Insufficient tightening (leakage risk).
Tightening the bolts in a cross (star) pattern and gradually ensures that the pressure is distributed evenly across the gasket and extends the service life of the gasket. This application is a critical step for both a safe and efficient assembly.
What Should Be Considered During the Disassembly of Expansion Gaskets?
The disassembly of expansion gaskets requires as much care and safety as the assembly. In this process, points such as depressurizing the system, using appropriate equipment, and surface checks must be calculated as a priority. Accordingly;
System Pressure Must Be Relieved
Before the process begins, the system must be completely deactivated, and the internal pressure must be safely discharged. The uncontrolled opening of a pressurized line can lead to serious occupational accidents.
Appropriate Equipment Should Be Used
Suitable hand tools should be preferred for removing the gasket. Forceful interventions can damage flange surfaces and fasteners. If the gasket is stuck to the surface, safe methods that can be applied include:
- Controlled and light heat application,
- Use of solvents or lubricants that do not damage the material.
These techniques help to disassemble the gasket much more safely compared to pulling or forcing it.
Surface Control and Cleaning
After the gasket is removed, flange surfaces should be cleaned again and checked for wear, scratches, or deformations. When necessary, surface grinding or maintenance procedures should be applied.
What Are the Safety Measures in Assembly and Disassembly Processes?
Safety is always a priority in industrial facilities. Especially when working with pressurized systems, the use of the following personal protective equipment should not be neglected:
- Protective goggles (industrial type),
- Cut-resistant mechanical protection gloves,
- Work clothing complying with standards,
- Face shield where necessary.
On the other hand, it is essential that the personnel performing the operation have received technical training and act in accordance with the manufacturer's instructions. These measures both prevent occupational accidents and ensure that assembly and disassembly operations are completed safely and efficiently.
