GDF fluorforede rørledningspumper

Rørledningspumpe er en enkeltsugende enkelttrins- eller flertrinscentrifugalpumpe, hører til den lodrette struktur, fordi dens import og eksport i samme lige linje, og import- og eksportkaliberet er det samme, som en sektion af rørledningen, kan installeres i enhver position af rørledningen, så kaldet rørledningspumpe (også kendt som boosterpumpe). Strukturelle egenskaber: enkeltsugningscentrifugalpumpe, indløb og udløb er de samme og i samme lige linje, og akselens midterlinje er direkte krydset, det er en lodret pumpe.

1、 Matching of pipeline parts for centrifugal pumps
Some pipeline centrifugal pump users believe that this can increase the actual head, but in fact, the actual head of the pump is equal to the total head to the loss head. After the water pump model is determined, the total head is fixed; The loss of head mainly comes from pipeline resistance. The smaller the pipe diameter, the greater the resistance, and therefore the greater the loss of head. Therefore, reducing the pipe diameter not only fails to increase the actual head of the water pump, but also decreases, leading to a decrease in pump efficiency. Similarly, when a small diameter water pump uses a large water pipe for pumping, the actual head of the pump will not be reduced. Instead, the loss of head will be reduced due to the decrease in pipeline resistance, resulting in an increase in actual head.
Some experts also believe that when using a large water pipe to pump water from a small diameter water pump, it will greatly increase the motor load. They believe that as the pipe diameter increases, the water in the outlet pipe will exert greater pressure on the pump impeller, thus greatly increasing the motor load. Little did they know that the magnitude of liquid pressure is only related to the height of the head, and is not related to the cross-sectional area of the water pipe. As long as the head is constant, the size of the impeller of the water pump remains unchanged. Regardless of the pipe diameter, the pressure acting on the impeller is constant. However, as the pipe diameter increases, the water flow resistance decreases, leading to an increase in flow rate and an appropriate increase in power consumption. But as long as it is within the rated head range, the water pump can work normally no matter how the pipe diameter is increased, and it can also reduce pipeline losses and improve water pump efficiency.
2、 High head water pump for low head pumping
Some pipeline centrifugal pump users believe that the lower the pumping head, the smaller the motor load. Under the misleading misconception, when choosing a water pump, the head of the pump is often chosen to be very high. In fact, for centrifugal water pumps, when the pump model is determined, the power consumption is directly proportional to the actual flow rate of the pump. The flow rate of the water pump will decrease with the increase of head, so the higher the head, the smaller the flow rate, and the smaller the power consumption. On the contrary, the lower the head, the greater the flow, and the greater the power consumption. Therefore, in order to prevent motor overload, it is generally required that the actual pumping head of the water pump should not be less than 60% of the calibrated head. So when high head is used for low head pumping, the motor is prone to overload and heat generation, and in severe cases, it can burn out the motor. In case of emergency use, a gate valve (or block the small water outlet with wood, etc.) must be installed on the water outlet pipe to reduce the flow (official account number: pump steward) and prevent motor overload. Pay attention to the temperature rise of the motor. If the motor is found to be overheated, the water outlet flow should be reduced or turned off in a timely manner. This is also prone to misunderstandings. Some operators believe that blocking the outlet and forcibly reducing the flow rate will increase the motor load. In fact, on the contrary, the outlet pipes of regular high-power centrifugal pump irrigation units are equipped with gate valves. In order to reduce the motor load during unit startup, the gate valve should be closed first, and gradually opened after the motor starts. This is the principle.
3、 There are many bends on the inlet pipeline of the centrifugal pump in the pipeline
If more elbows are used in the inlet pipeline, it will increase local water flow resistance. And the elbow should turn in the vertical direction, not in the horizontal direction to avoid air accumulation.
4、 When installing the water inlet pipeline, the horizontal section should be horizontal or upward
This will cause air to accumulate in the inlet pipe, reduce the vacuum degree of the water pipe and water pump, reduce the suction head of the water pump, and reduce the water output. The correct approach is: the horizontal section should be slightly inclined towards the direction of the water source, not horizontal, and not tilted upwards.
5、 The inlet of the pipeline centrifugal pump is directly connected to the elbow
This will cause uneven distribution of water flow when entering the impeller through the elbow. When the diameter of the inlet pipe is larger than that of the water pump inlet, an eccentric variable diameter pipe should be installed. The flat part of the eccentric reducer should be installed above, and the inclined part should be installed below. Otherwise, air will gather, resulting in a decrease in water output or inability to draw water, and there will be a sound of impact. If the diameter of the inlet pipe is equal to that of the water pump inlet, a straight pipe should be added between the water pump inlet and the elbow, and the length of the straight pipe should not be less than 2-3 times the diameter of the water pipe.
6、 The outlet pipe of the pipeline centrifugal pump is above the normal water level of the outlet water tank
If the outlet is above the normal water level of the water tank, although the pump head is increased, the flow rate is reduced. If the water outlet must be higher than the water level of the water tank due to terrain limitations, elbows and short pipes should be installed at the pipe outlet to make the water pipe a siphon type and reduce the height of the water outlet.
7、 The position of the water inlet of the inlet pipe is incorrect
① The distance between the inlet of the inlet pipe and the bottom and wall of the inlet pool is smaller than the diameter of the inlet. If there is sediment and other pollutants at the bottom of the pool, and the distance between the water inlet and the pool bottom is less than 1.5 times the diameter, it will cause poor water intake or suction of sediment and debris during pumping, blocking the water inlet.
② When the inlet depth of the inlet pipe is not enough, it can cause vortices to form on the water surface around the inlet pipe, affecting the inlet and reducing the water output. The correct installation method is: the inlet depth of small and medium-sized water pumps should not be less than 300-600mm, and that of large water pumps should not be less than 600-1000mm.
8、 When installing a bottom valve, the bottom section of the inlet pipe is not vertical
If installed in this way, the valve cannot close on its own, causing water leakage. The correct installation method is to install the inlet pipe with a bottom valve, and the bottom section should preferably be vertical. If vertical installation is not possible due to terrain limitations, the angle between the water pipe axis and the horizontal plane should be at least 60 °.
Pipeline centrifugal pump is the most widely used and widely used pump type in various fields. Pharmaceutical users have understood the eight misconceptions of pipeline centrifugal pumps and try to avoid the above mentioned ones as much as possible. Shanghai Sunshine Pump Industry is a professional manufacturer of pipeline centrifugal pumps with rich production experience and complete testing equipment, ensuring the stability, reliability, and long service life of product quality.