Post-maintenance method of packing
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1. Once the packing is assembled, it can be put into operation. Before starting the vehicle or system, it's important to perform a test run by manually cranking the unit slowly. During this process, if excessive torque is felt, it might indicate that the packing gland is over-tightened. To resolve this, loosen the gland bolt gradually until the frictional resistance decreases and the sealing remains effective without leakage. This applies to various types of packing such as graphite, asbestos, PTFE, cotton, high-water-based, and aramid packing.
If during startup you notice high friction torque and the stuffing box becomes excessively hot, this could be due to insufficient lubrication or over-tightening. Adjustments should be made accordingly, and if allowed, maintain a small amount of leakage for cooling and lubrication. In most centrifugal pumps handling non-hazardous media, a slight dripping is normal and helps keep the seal functioning properly.
2. After actual operation, regularly monitor the packing for signs of leakage and check the temperature of the stuffing box. If the braided packing shows any irregularities, adjust it immediately. If the leakage exceeds acceptable limits, tighten the gland slightly, but no more than one full turn at a time. Always ensure that the allowable leakage is maintained to prevent sudden increases in friction heat, which could damage the packing material. This advice applies to all common types of packing, including graphite, asbestos, PTFE, cotton, high-water-based, and aramid packing.
3. For dynamic seals, especially those with high linear speed, continuous cooling water or lubricant should be applied. This is a highly effective method to enhance the sealing performance and extend the life of the packing material.
4. Storage Precautions for Packing
1) Sealed packing should be stored in a cool, well-ventilated area. Avoid direct sunlight exposure, as it can cause degradation of the material. Do not store packing near corrosive substances like acids or alkalis, nor in high-temperature, radiation-prone, or very cold and humid environments.
2) When handling and storing packing, take care to avoid contamination from sand or dust. If impurities get stuck on the packing, clean it thoroughly before installation to prevent damage to the shaft surface and to ensure proper sealing performance.
3) For packing used in nuclear power plants, extra precautions are necessary. Avoid contact between the packing and materials containing chloride ions, as this can lead to serious issues. This advice applies to all standard packing types, including graphite, asbestos, PTFE, cotton, high-water-based, and aramid packing.
Proper installation, maintenance, and storage of packing materials are essential for ensuring long-term performance and safety. Following these guidelines will help prevent leaks, reduce wear, and improve overall system efficiency.
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