In-line plugging of non-metallic expansion joints refers to temporary or permanent repair measures that can be carried out without stopping the system in case of leakage or damage to the expansion joints. This technology is especially suitable for those industrial systems where downtime costs are high or it is impossible to stop operation easily, such as power plants, chemical plants, etc. Online plugging can reduce production losses caused by downtime, avoid environmental pollution, and prevent possible safety accidents.
Online plugging technology usually involves the following key steps and key points:
Leak Detection: First, the exact location and extent of the leak needs to be determined. This can be done by means of visual inspection, infrared thermography, ultrasonic detection, etc.
Selecting Plugging Materials: It is crucial to choose the sealing material suitable for the working conditions. For example, using adhesives and curing agents that are resistant to high temperatures and corrosion, such as the previously mentioned "Acid-and Water-Blocking Adhesives for High Temperature Adhesive Steel Sheets" and its transient curing agents, the material can instantly cure and maintain good sealing performance at high temperatures.
Prepare job area: Clean up dirt, grease, or residue around the area of the leak, ensuring that the adhesive can adhere sufficiently to the surface of the expansion joint.
Implement a plugging: Apply or inject the selected sealing material into the leakage area, sometimes with the help of special tools or equipment. The material is applied in such a manner that a strong sealing layer is formed.
Curing time: Depending on the nature of the material used, it may be necessary to wait for a period of time for the material to fully cure, during which the system pressure and temperature are monitored to ensure that the material can cure successfully and form a seal.
Follow-up monitoring: After the plugging is completed, the condition of the expansion joint should be continuously monitored to confirm whether the leak has been completely eliminated, and the long-term effect of the plugging material should be evaluated.
It is important to note that while online blockade can be used as an emergency measure, it may not be a long-term solution. Where possible, it should be planned to schedule an overhaul or replacement of the equipment to completely resolve the problem with the expansion joint. In-line plugging technology should be considered a temporary solution until the system can be safely shut down for complete repair or expansion joint replacement.
In addition, when conducting online blocking operations, operators must strictly abide by safety regulations and wear appropriate personal protective equipment to ensure the safety of personnel during the operation.