(1) Problems occur: the shaft deviation causes high vibration, shortens the life of the mechanical seal, and generates noise.
Solution: Use the impeller mouth ring of polyimide carbon fiber composite material to fit the stainless steel pump casing ring; replace the original graphite bushing with the throat bushing of our material.
The result: reduced vibration amplitude, which extends seal life and bearing life and enhances pump free operation. Many pumps use packing as a filler in their use. The main function of the packing is to prevent leakage, but it also acts as a bearing to stabilize the shaft. At present, many pumps have changed the packing to a mechanical seal. With the change of the mechanical seal, the bearing influence is gone, and the shaft deviation (high vibration and related influence) becomes a problem.
The use of polyimide carbon fiber composite material to improve the pump successfully solved the customer's problems, mainly in the following two points:
1) Polyimide carbon fiber composite is a metal-free, non-biting material. This allows the running clearance to be reduced (only half of the gap between the metal gaps specified by the API), the bushing with smaller clearances can stabilize the shaft, and the smaller gap ring can further limit leakage and leakage speed.
2) Polyimide carbon fiber composite is a high strength, high performance thermoplastic material. It is easy to injection and absorbs vibrations and shocks, while the metal being replaced can cause vibration and shaft wear.
Parts: with removable sealing bushings and Teflon bearings
(2) There is a problem: the support bearing is severely worn. The factory tried a lot of different materials such as carbon, graphite, and filled Teflon materials, trying to find a suitable solution to the problem of wear and shaft deviation. All materials were scrapped in two to three months. Among them, the product of polytetrafluoroethylene causes wear of the shaft, causing great leakage, resulting in failure of the mechanical seal.
Solution: Replace the previously used filled PTFE bearing with a polyimide carbon fiber composite.
RESULTS: After the polyimide carbon fiber composite support bearing was installed, it has been successfully operated for more than 13 months. At the 8th month after use, the center part of the agitator was removed and temporarily used for other equipment. At that time, the staff tested it. The agitator bearing found that the leakage per inch per inch was less than 0.005, and the average failure interval increased by 300% to 400%.
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