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1. After the packing is assembled, it can be put into operation. Before starting the car, you should start the test run (cranking) slowly with manpower. In operation, if there is excessive torque, it may be caused by overtightening of the packing gland. It can be loosened by loosening the gland bolt until the frictional resistance becomes small and the degree of sealing does not leak. (graphite packing, asbestos packing, PTFE packing, cotton packing, high water based packing, aramid packing)
When the packing is started, if the friction torque is found to be large, the temperature of the stuffing box is long, which may be caused by lack of lubricant or excessive pre-tightening force. Measures should be taken to adjust and, where permitted, control the appropriate seal leakage. For most centrifugal pumps with harmless media, a small amount of drop leakage should be maintained during normal operation to provide cooling and lubrication.
2. After the actual driving, the packing should adhere to the observation on time, pay attention to whether the leakage of the braided packing and the temperature of the stuffing box meet the requirements. If the braided packing is abnormal, it should be adjusted immediately. If the packing seal leakage is greater than the allowable value, the gland can be tightened, but not more than one turn at a time, and the allowable packing seal leakage is still required to prevent the friction heat from suddenly increasing and burning the seal packing. (graphite packing, asbestos packing, PTFE packing, cotton packing, high water based packing, aramid packing)
3. For the packing on the dynamic seal, especially the sealing part with high line speed, continuous cooling water or lubricant should be poured, which is a powerful measure to improve the sealing effect and prolong the life of the packing.
4, storage precautions for packing
1) Sealed packing should be stored in a place where it is exposed to normal temperature and ventilation; prevent direct sunlight from being irradiated to avoid deterioration and deterioration of the sealing packing. Do not store sealed packing near corrosive materials such as acid or alkali, or store sealed packing in high temperature radiation or low temperature and humid environment.
2) Sealing packing In the process of handling and stocking, care should be taken to prevent sand and dust from contaminating the packing. Once the impurities are adhered, the filler should be thoroughly removed to avoid damage to the surface of the shaft after assembly and affect the sealing effect.
3) For the sealing packing used in nuclear power plants, in addition to the above points, special care should be taken to avoid the packing sealing contact with substances containing chloride ions. (graphite packing, asbestos packing, PTFE packing, cotton packing, high water based packing, aramid packing) 