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The self-priming centrifugal pump relies on the high-speed rotation of the impeller to pump the water in the low-pressure zone of the self-priming pump. Therefore, the centrifugal pump must ensure that the inlet pipe does not leak, that is, the outside air cannot enter the inlet pipe, otherwise the pumping efficiency will be affected, and The pump generates severe vibration and noise during operation.
If the pump is running dry or not priming properly, one of the first things to check is whether there are leaks in the inlet pipe. Common issues include small holes, cracks, or loose joints that allow air to enter the system. Some defects are so subtle that they are hard to spot with the naked eye. Here are a few simple and effective methods to detect leaks in the suction pipe.
(1) Duck feather method: When the pump is running, bring a duck feather close to the suspected area. If air is leaking, the feather will flutter. Similarly, you can use a lit cigarette—observe the direction of the smoke to identify where air is entering.
(2) Oil test: For hard-to-reach areas, apply a small amount of oil to the suspected location. If air is entering, the oil will be quickly sucked away, indicating a leak.
2. Measures to Prevent Air Ingestion in Self-Priming Centrifugal Pumps
(1) Install the self-priming pump as close to the water source as possible to prevent air from being drawn in when the water level drops.
(2) When installing the suction pipe, make sure it slopes slightly downward toward the pump or is installed horizontally in the direction of water flow. Avoid having the pipe higher than the pump’s inlet, as this can trap air inside.
(3) Ensure the packing gland is properly tightened but not overly compressed. If the packing is worn or damaged, replace it immediately. Also, keep the water seal line clean to avoid blockage, which could lead to air leakage through the packing area.
(4) When connecting flanges, clean the contact surfaces thoroughly before applying a 3–5 mm thick rubber gasket in the center. Tighten the bolts gradually and evenly to ensure a proper seal.
By following these steps, you can significantly improve the performance and lifespan of your self-priming centrifugal pump. Always perform regular inspections and maintenance to prevent costly downtime and inefficiency. From: http://NewsDetail281T2.html China Hardware Business Network http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
A self-priming centrifugal pump operates by using the high-speed rotation of its impeller to create a low-pressure area that draws water into the pump. This means that the inlet piping must be completely sealed, as any air entering the system can significantly reduce pumping efficiency and cause severe vibration and noise during operation.