During the maintenance and testing of the two pumping units at Yangzhou No. 2 Power Plant, it was observed that the vibration levels initially increased significantly. However, after a certain period, the vibration gradually decreased and eventually stabilized. This fluctuation in vibration could be attributed to the disassembly and reassembly of the upper frame, as well as the lifting of the entire motor. These operations can impact critical motor parameters such as alignment, oil distribution, and air gap uniformity. In more severe cases, misalignment may occur, which could lead to uneven oil flow or an irregular air gap. To ensure proper operation, it is essential to measure the concentricity between the thrust head and the upper cylinder—specifically, the distance between the thrust head journal and the machined surface of the upper cylinder—as well as to check the air gap. If any deviation is found to be excessive, adjustments must be made accordingly.
The fastening bolts connecting the motor to the water pump are typically tightened using a torque wrench to ensure consistent and accurate tightening. Similarly, the bolts securing the motor base should be tightened by the same person to maintain uniformity. The tightness should match the original degree of tightness during disassembly, and all bolts should be tightened evenly and symmetrically. In practice, the order in which bolts are tightened and the force applied can influence the horizontal and angular alignment of the motor. This effect is particularly noticeable in long and slender shafts, where even small changes in bolt tightness can result in significant variations in swing or wobble.
Additionally, the positioning pins between the upper frame and the base, as well as between the motor and the base, must be placed back in their original positions. They should not be moved or misplaced. When reinstalling the locating pin, it should be turned so that it naturally falls to its maximum depth before being secured. This ensures that the pin fits properly into the hole, as the unit has already achieved a good fit after extended operation. If the positioning pin is incorrectly placed, it may cause misalignment of the motor, which can affect the level and concentricity of the fixed components. Proper attention to these details is crucial for maintaining the integrity and performance of the system.
Pneumatic FRL
Pneumatic Filter Regulator Lubricator (FRL) is used to deliver clean air, at a fixed pressure, and lubricated (if needed) to ensure proper pneumatic component operation and increase their operation lifetime. Filters, regulators, and lubricators can be bought individually or as a package.
1. Pneumatic Filter: remove water, dirt and other harmful debris from an air system. This is often the first step in improving the air quality.
2. Pneumatic Regulator: adjust and control the air pressure of a system to ensure that down-line components do not exceed their maximum operating pressures. This is the second step in the FRL system.
3. Pneumatic Lubricator: reduce the internal friction in tools or equipment by releasing a controlled mist of oil into the compressed air. This is often done last and/or right before the component needing lubrication.
Pneumatic FRL, Pneumatic FRL Unit, Air Source Treatmnet, Air Preparation Unit, Air Service Unit
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