This has been confirmed through our daily operations, where the system can run for extended periods, potentially leading to overheating and damage to the rubber bearings. (3) Vibration caused by overload. The thrust washer pump uses a tin-based Babbitt alloy, capable of withstanding a load of 18MPa (180kgf/cm²). During start-up, the lubrication of the thrust pad is in a boundary lubrication state. At the pump outlet, an electric butterfly valve and a manual gate valve are installed. When the pump starts, the electric butterfly valve is opened simultaneously. However, if the valve plate cannot open due to sediment buildup or if the manual valve is closed by human error, or if the exhaust is not timely released, it can result in severe vibration of the pump body. This often leads to rapid burning of the thrust pad. The #17 pump is a typical example of this issue.
(4) Outlet turbulence-induced vibration. The pump’s outlet includes a short pipe, check valve, electric butterfly valve, manual valve, pressure gauge, and a water hammer eliminator. Turbulent flow within the system creates irregular pulsations. Each valve introduces significant local resistance, causing changes in momentum and pressure. These fluctuations exert forces on the pipe walls and the pump, resulting in vibrations that can be observed through pressure gauge readings. The fluctuating pressure and velocity fields from 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, resonance occurs, leading to 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. After implementing these measures, the vibration levels were significantly reduced.
(5) Torsional vibration in deep well pumps. 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, multiple vibrational frequencies at different angular velocities overlap. The superposition of two simple harmonic vibrations with different angular frequencies does not necessarily produce a harmonic vibration, resulting in a two-degree-of-freedom torsional vibration, which is unavoidable. This type of vibration primarily affects and damages the thrust pad. To ensure proper functioning, 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 the formation and maintenance of a stable dynamic pressure lubrication film.
(6) Vibration interaction between pumps mounted on the same beam. 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. If one motor experiences excessive vibration during no-load testing—such as when the elastic coupling is disconnected and the motor is idling—the amplitude of the other normally operating pump motor may rise to approximately 0.15mm. This situation is often difficult to detect but requires close attention.
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