This has been confirmed through our daily operations, where the system can run for a longer period and may eventually lead to overheating and damage to the rubber bearings. (3) Vibration caused by overload. The thrust washer pump uses a tin-based Babbitt alloy, which is designed to handle a load of 18MPa (180kgf/cm²). At startup, the lubrication of the thrust pad is in a boundary lubrication state. An electric butterfly valve and a manual gate valve are installed at the pump outlet. When the pump starts, the electric butterfly valve is opened simultaneously. However, if the valve plate fails to open due to sediment buildup or if the manual valve is accidentally closed, or if the exhaust is not timely released, this can cause severe vibration in the pump body, leading to rapid wear of the thrust pad. This was exactly what happened with pump #17.
(4) Outlet turbulence vibration. The pump outlet includes a short pipe, check valve, electric butterfly valve, manual valve, pressure gauge, and a water hammer eliminator. The turbulent flow of water creates irregular pulsations. With each valve partially closed, the local resistance increases, causing changes in momentum and pressure fluctuations. These fluctuations exert forces on the pipe walls and the pump, resulting in vibrations. This can be observed through the pulsation on the pressure gauge. The fluctuating pressure and velocity fields from the turbulent flow continuously transmit energy to the pump body. When the main frequency of the turbulence matches the natural frequency of the deep well pump system, the system absorbs energy, leading to resonance and increased vibration. To reduce this effect, valves should be fully opened, the short pipe should have an appropriate length, and additional bearings should be added. Following these adjustments, the vibration levels were significantly reduced.
(5) Deep well pump torsional vibration. The long-axis deep well pump is connected to the motor via a flexible coupling, with a shaft length of 24.94 meters. During operation, there is a superposition of vibrations at different angular frequencies. The combination of two simple harmonic motions with different frequencies does not necessarily result in a harmonic motion, meaning that a two-degree-of-freedom torsional vibration exists within the pump body, which is unavoidable. This type of vibration mainly affects the thrust pad. To ensure proper function, each plane must have a corresponding thrust pad with a proper oil wedge. We upgraded the original 68# oil to 100# oil to increase the viscosity of the thrust pad lubricant, ensuring that the dynamic pressure lubrication film remains intact and stable.
(6) Vibrations caused by pumps mounted on the same beam interacting with each other. The deep well pumps and motors are installed on two reinforced concrete beams with cross-sections of 1450 mm x 410 mm. Each pump and motor has a mass concentration of 18 tons. When two adjacent pumps operate on the same beam, they form a two-degree-of-freedom vibration system. During testing, one motor showed significant vibration even without a load. When the motor was idling without the elastic coupling connected, the amplitude of the neighboring pump motor rose to about 0.15 mm. This situation is not easily noticeable but should be taken seriously.
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