The expansion joint tie rod bolt plays a very important role in the pipeline system, mainly used to control and limit the displacement of the expansion joint, and ensure that the expansion joint works within the range allowed by the design. The following is the specific role of the expansion joint tie rod bolt:
Limit action：
Tie rod bolts can limit the displacement of the expansion joint, preventing it from excessively stretching or compressing, thus avoiding damage due to excessive displacement.
Especially during system start-up or shutdown, tie rod bolts can limit the initial displacement of the expansion joint, ensuring that it operates within a safe range.
Protective effect：
During the transportation and installation of the expansion joint, the tie rod bolts can maintain the shape of the expansion joint, preventing the bellows from mechanical damage during transportation or cracking of the weld due to shock.
Prevent blind plate force：
For some types of expansion joints, such as large tie rod corrugation compensators and small tie rod corrugation compensators, the tie rod bolts not only limit expansion and contraction, but also prevent additional blind plate forces from acting on the expansion joint.
Blind plate force refers to the unbalanced force bearing by the expansion joint due to asymmetric or uneven displacement of the pipeline system.
Transportation protection：
During transportation, tie rod bolts are used to maintain the shape of the expansion joint, preventing the bellows from mechanical damage during transportation or cracking of the weld due to shock.
Installation and positioning：
When installing an expansion joint, tie rod bolts can help position the expansion joint, ensuring it is installed in the correct position.
Adjustment and positioning：
After installation, it is usually necessary to loosen or adjust the tie rod bolts according to the size of the expansion amount, so that the expansion energy saving can work normally.
For some types of expansion joints, the tie rod bolts cannot be removed after installation, but are adjusted to compensation as needed.
Precautions for use:
The position and tension of the tie rod bolts should be carefully checked before installing the expansion joint.
During installation, ensure that the tie rod bolts are properly connected to the expansion joint, and make preliminary adjustments as necessary.
During system start-up or shutdown, tie rod bolts should be adjusted according to the manufacturer's operating guidelines.
Check the condition of the tie rod bolts regularly to ensure they are free from rust, wear or loosening.
Conditioning method:
Preliminary adjustment: When installing the expansion joint, first adjust the tie rod bolt to the preset position to ensure that the expansion joint can be in the correct initial position.
Operating regulation: After the system runs for a period of time, adjust the tie rod bolts according to the actual displacement of the pipeline to ensure the expansion energy saving free expansion and contraction.
Periodic inspection: During routine maintenance, check the status of the tie rod bolts regularly and re-adjust them if necessary.
Ensure that the expansion joint tie rod bolts are installed and adjusted in accordance with the manufacturer's guidance documents to ensure the proper operation of the expansion joint and the safety of the piping system.