Ensuring the airtightness of air-cooled large tie rod expansion joint is one of the key factors to ensure its proper operation and extend its service life. The following are some specific measures and technical means to ensure and maintain good sealing performance of expansion joints:
Design and Material Selection
Choose high-quality sealing materials：
Select high-performance sealing materials suitable for working conditions (such as temperature, pressure, medium type), such as high-temperature resistant fluororubber, silicone rubber cloth, polytetrafluoroethylene (PTFE), etc.
For special applications, consider using composite sealing materials with metal skeletons or other reinforced structures to improve the mechanical strength and durability of the seal.
Optimized seal design：
The design should take into account the possible displacement and pressure variation, and adopt multi-layer seal or double seal structure to increase seal reliability.
Ensure that the sealing surface has sufficient contact area and flatness to reduce the risk of leakage.
Considerations during installation
Precise installation：
During installation, follow the instructions provided by the manufacturer strictly, ensuring that the flange connections are tightly connected and evenly stressed.
Use a torque wrench to tighten the bolts according to the specified torque value to avoid seal failure due to too tight or too loose.
Check seal status：
After installation, carefully check the seals at all joints, and if necessary, perform pressure tests to confirm that no leakage occurs.
If a poor seal is found, the sealing gasket should be adjusted or replaced in time and retested until the requirements are met.
Protective sealing surface：
During installation, special care should be taken not to allow foreign objects or tools to directly contact the sealing surface, so as to avoid scratches or damage.
Avoid applying uneven external force to the bellows to prevent its deformation from affecting the sealing effect.
Routine maintenance and monitoring 3>Periodic inspection：
Establish a regular inspection system to detect and deal with potential problems such as surface wear, cracks or other abnormal conditions in a timely manner.
Check the seal for signs of aging, cracking, hardening, etc., and take steps to repair or replace the problem as soon as it is identified.
Periodic inspection：
Establish a regular inspection system to detect and deal with potential problems such as surface wear, cracks or other abnormal conditions in a timely manner.
Check the seal for signs of aging, cracking, hardening, etc., and take steps to repair or replace the problem as soon as it is identified.
Cleaning and maintenance：
Clean the expansion joint and its surrounding area regularly to prevent dust, oil, or other debris from accumulating to affect the sealing performance.
Implement anti-corrosion treatment on the exposed parts to extend the life of the seal.
Monitor operating parameters：
Monitor the temperature, pressure and other key parameters of the pipeline system where the expansion joint is located in real time. Once it exceeds the normal range, the operation state should be adjusted in time or corresponding measures should be taken.
Lubrication and rust prevention：
For moving parts, such as hinges, nuts, etc., lubricating oil should be applied regularly to maintain flexibility and prevent rust, thus indirectly guaranteeing the sealing effect.
Precautions under exceptional circumstances
Dealing with Extreme Working Conditions：
In harsh environments (e.g. high humidity, highly corrosive), additional protective measures can be considered, such as adding a waterproof cover to the outside of the seal or using a special anti-corrosive coating.
Application of wet flue gas desulfurization system：
For the non-metallic expansion joint used in wet flue gas desulfurization system, due to the existence of a large amount of weak acid water, it is easy to cause the internal fabric layer of the expansion joint to be damaged and cause leakage. Therefore, a special on-line plugging method with full sealing technology can be adopted to fundamentally isolate the direct contact between the flue gas and the expansion joint, and ensure the normal operation of the process.
Emergency Response
Prepare contingency plans：
Develop a detailed contingency plan and prepare the tools, materials, and human resources needed for a quick response so that you can act quickly in the event of a sudden spill.
Including but not limited to temporary blocking devices, emergency shutdown procedures, and personnel evacuation plans, etc.
Through the above comprehensive measures, the sealing performance of the expansion joint of air-cooled large tie rod can be comprehensively guaranteed from the design source to the practical application, and it can operate safely and reliably under various working conditions. At the same time, continuous attention to the development of new technologies and the application of new materials can also help to further improve the sealing performance of expansion joints.