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There are many things to consider before purchasing a Dredge pump for a water system.
Introduction
Anyone looking to buy a new pump for their water system needs to answer several questions before considering any recommendations from the manufacturer. Below are some important points to keep in mind.
What will be pumped?
This is a fundamental question. Not all fluids can be pumped using a centrifugal pump. There are four types of pumps commonly encountered in water systems: clean water pumps, gray water pumps, sewage pumps, and saltwater pumps. The latter is often used for pumping other chemically reactive media and, therefore, is made from durable materials. Stainless steel is typically used for pumping drinking water. Pro tip: For saltwater pumps, an anode block should be installed on the pump to prevent corrosion.
Dredge Pump Set
What is the required flow rate?
The amount of water to be pumped (in liters per minute or cubic meters per hour) is usually the determining factor in determining the required pump output. Each pump covers a range of operation and has an optimum value, which is why there are so many types of pumps available. For example, the market leader Tsurumi offers approximately 800 different models. The flow rate of gray water pumps can reach up to 30 m3/min. Don't forget to consider the diameter of the pipes through which the water flow needs to pass. Pro tip: Choose a pump with a lower speed as they are less prone to wear and tear.
How high/far does the medium need to be pumped?
This question is related to the previous one. For centrifugal pumps, as the pumping height increases, the flow rate decreases. The main factor here is the absolute height difference between the upper and lower water levels (total head). High-pressure pumps can pump up to 200 meters or more. The same principle applies to situations where the horizontal distance is very large (i.e., the distance is very far). Pro tip: Two identical pumps can be operated in series - the second pump acting as a booster pump, almost doubling the output (total head).
Dredge Dishcarge Stockpile by Doris
Will it "snore"?
This is what experts refer to as the pump not only sucking in water but also occasionally sucking in air, resulting in a sound similar to snoring. This can occur, for example, when the water level is too low in certain situations. This is crucial for many pumps as they can quickly overheat when pumping insufficient media. Pro tip: Ensure that the pump has a dry run protection feature - this will enable them to withstand this kind of stress.
Will the water flow vary?
If the pump is not needed frequently, pumps equipped with permanent liquid level sensors are a solution as they can switch on and off automatically. Electrode sensors are much more reliable than mechanical contact switches. Additionally, external control devices can also be used. Pro tip: Frequency converters can ensure smooth start-ups, prevent pressure fluctuations, and balance multi-pump systems.
Does the pumped medium contain solid substances?
This question is particularly important when considering Grey water pumps and sewage pumps, as each gray water pump can only handle a certain amount of solid substances. If these substances are in particulate form, such as gray water, the perforation size of the pump's filter screen indicates which particles can still pass through; some particles can be up to 30 millimeters in size. Compared to other pumps, sewage pumps tend to clog faster, which is why they need impellers with cutting blades that can even cut through intertwined fibers. Pro tip: When pumping viscous media, a mixer should be used before the suction inlet to ensure smoother flow of these substances.
And also some pump need to handle sand gravel slurry etc, need to consider the pump can pass through the particle and also including the branches .
Taian Ocean Pump Co.,ltd can supply for Sand pump machine is most commonly used in pumping system that move sand deposits to long distance. It is simply classified as sand suction pump, slurry pump and gravel pump. They are widely used in mining, metallurgy, coal washing, power plants, sewage water treatment, dredging, and chemical and petroleum industries. We are dedicated to develop high efficient sand suction pump for your most challenging pumping applications.
For more information, please visit Dredger Pumps manufacturer.
What is the temperature of the pumped medium?
The pump's temperature is typically around 40°C for most media, but it can reach higher temperatures within the process. In such cases, customized solutions are required. Important design features include the heat dissipation process and seals. Pumps with top discharge or volute pumps will dissipate more heat. Pro tip: Do not operate the pump beyond the specified limits for thermal operation.
Electrical connections?
Centrifugal pump drive equipment requires different voltage ranges. The higher the voltage range, the higher the connected load, so appropriate connections need to be made on-site. In many cases, the starting current of the pump (which can be very high!) is not taken into account, especially when using a generator set. The operating voltage for most pumps is single-phase 230 volts or three-phase 400 volts. They are connected either with a direct starter or a star-delta starter. Pro tip: Only use pumps certified by APEX in potentially explosive areas.
Installation and operation?
Some pumps can only be installed in dry environments at the pump station, while submersible pumps operate immersed in the medium. The maximum immersion depth is usually clearly stated in the pump's datasheet. Some pumps can even be installed in dry environments; just inquire if they are suitable for permanent operation. Pro tip: Ensure that the pump has a centrifugal oil lubrication system as these pumps work perfectly in both horizontal and vertical installation positions.
Whether to perform maintenance work yourself depends on your personal skills and level of experience. For some common maintenance tasks, such as replacing impellers or cleaning filters, some people may choose to perform maintenance on-site to save on repair costs and minimize downtime. However, for more complex repair work or tasks that require special skills and specialized equipment, it is generally recommended to rely on trained professionals or the manufacturer's service team. They have the expertise and tools necessary to ensure proper maintenance and minimize the risk of further damage. It's important to assess your own capabilities and determine if you have the necessary knowledge and resources to carry out maintenance tasks effectively and safely.
Design and selection personnel need to pay attention: the head of ordinary water pump has usage range. National standards and national quality inspection departments only require that the water pump should be used within the range of 0.7-1.2 times the rated flow(about 1.1 to 0.8 times of the rated head). High head water pump is not allowed to be used at low head. The rated head of high quality dredge pump selected according to the selection principle of this article, the head may exceed the usage range of the ordinary water pump in actual use(because the head reserve is large),so it is required to pay attention to the selected high quality dredge pump head.
After determining the rated head of the sand pump equipment, it is necessary to further check the rated flow of the dredging pump. Since the actual head is lower than the rated head in actual use, the actual flow is greater than the rated flow. It is necessary to check the rated flow and actual flow according to the performance curve of the sand pump. If the difference is not large, select the rated flow directly according to the design flow (as the sand pump wears, the actual flow will gradually decrease, so some reserve is also set aside.); If the difference is too large, the rated flow of the high quality dredge pump should be less than the design flow.
In addition, the OCEAN Pump dredging pump has the advantage of multiple units in series, which can reduce the cost of the drainage system. Users in need can consult our technical engineers.
3. Determine the slurry density and solid concentration, select the appropriate motor power
Water pump output power P = ρgQH
ρ&#;&#;Density of slurry transported by pump
g&#;&#;acceleration of gravity
Q&#;&#;Flow of pump
H&#;&#;Pump head
When choosing a high quality dredge pump, the slurry density must be considered. The slurry density is different and the matching motor power is different.
When the slurry density is the same, due to the different specific gravity of the solid medium, the slurry concentration is also different. If the concentration is too high, the fluidity of the slurry is poor, and the power of the high quality dredge pump will increase significantly, which is easy to block the sand slurry pump and burn the motor. Therefore, the high quality dredge pumps stipulate the use conditions of the medium. For example: a kind of sewage pump, slurry density &#; kg / m³, slurry concentration volume ratio &#;4%.
The user needs to check whether the allowable slurry density and slurry concentration of the high quality dredge pump meet the requirements of the working conditions. Not only is it easy to overload the motor when it is used over the range, but the life of the dredge pump will be greatly reduced.
There are two types of slurry concentration:
Solid volume ratio = total volume of solids in slurry ÷ total volume of slurry
Solid weight ratio = total weight of solids in slurry ÷ total weight of slurry
Solid weight ratio is a common way of expressing concentration. All data such as slurry research, calculation, design, type selection adopt weight ratio. The solid volume is relatively intuitive. Most users often talk about the solid volume ratio when describing the slurry concentration.
For more Dredger Pumps factoryinformation, please contact us. We will provide professional answers.
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