What three details must be paid attention to during the daily inspection of high-pressure seals in supercritical equipment?
To ensure the long-term stable operation of supercritical equipment, the daily inspection of its high-pressure seals must not be a mere formality. In addition to routine visual inspection, three key points must be closely monitored-these details are particularly prone to causing malfunctions under harsh operating conditions and require extra attention.
The table below summarizes the key points of these three core inspection items, making it easy to quickly grasp the essentials:
| Inspection Details | Key Inspection Points | Potential Abnormalities and Risks |
|---|---|---|
| Lip Condition and Surface Damage | - Is the lip intact and free of cracks? - Are there any axial scratches, indentations, cracks, or gaps on the surface? |
- Cracks or damage can lead to direct leakage of the medium. - Surface imperfections can compromise the integrity of the seal, causing leakage or a decrease in the protection level. |
| Elasticity and Permanent Deformation | - Check the rebound force by touch to ensure it is sufficient. - Observe the permanent deformation after compression. |
- Insufficient sealing force can easily lead to leakage under high pressure. - Excessive permanent deformation indicates material degradation, reducing sealing effectiveness. |
| Installation Status and Orientation | - Is the lip direction correct (the pressure side should face inwards towards the system)? - Confirm that the seal is flat and correctly seated in the groove, without twisting or rolling. |
- Incorrect installation will directly lead to seal failure. - Twisting causes uneven pressure distribution, leading to premature wear or leakage. |
Maintenance Recommendations
In addition to the daily inspections mentioned above, performing the following can further improve seal reliability and achieve preventative maintenance:
Daily inspections cannot replace professional testing. It is recommended to send the seals to a professional laboratory periodically for testing key performance indicators such as compression set, fluid resistance, and hardness changes. Quantitatively assessing their aging state through data analysis is more accurate than relying solely on experience.
The chemical properties of the hydraulic fluid or other working media must be compatible with the seal material; otherwise, it can easily lead to seal swelling, corrosion, or accelerated aging. Additionally, note that fluid contamination levels are a major cause of abnormal premature seal wear; regular fluid analysis and proper filtration are essential.
For critical equipment, digital twin technology can be used to build a wear life prediction model. This allows for the scientific determination of replacement cycles, avoiding losses caused by unexpected downtime.
Routine inspections of high-pressure seals in supercritical equipment require careful attention for accurate problem identification. Focus on three key points: "lip condition, elasticity, and installation orientation"-these are the most readily observable aspects and also the most likely to cause serious malfunctions. Developing a habit of regular inspections, coupled with professional testing and data evaluation, is crucial to minimizing leakage risks and ensuring operational safety.