Submersible Sand Dredging Pumps, Submersible Sand Pumps
Submersible Sand Dredging Pumps are suitable to be used for pumping sand. Sand is pumped mixed with water up to 70% of solids by weight. The mixture of liquid and particles of sand and gravel is pumped in a procedure often used as a convenient way of handling sand and gravel. There are many applications for submersible sand pumps: sand and gravel extraction, dredging of rivers, harbors and marines maintenance or construction, beach reclamation, filling of Geotubes, among others. Here below you can read about some of the multiple applications of sand pumps.
Design Features:
▪ MOTOR: Could be electric or hydraulic. The cooling of the electric submersible sand dredging pump is important. If the sand pump works semi-submerged or if it is going to work dry for extended periods of time, it should include a cooling jacket. For Heavy duty electric sand submersible pumps is recommended to have a motor with Class H insulation. They could include also high temperature and /or moisture sensors.
▪ IMPELLER: The impeller is the rotating component of the submersible sand dredging pump. It transfers the centrifugal force to the sand. Usually made of High-chrome spheroidal alloy that is very abrasion resistant. The impeller could be closed, semi-open, open or recessed.
▪ CASING: The casing shape is generally of semi-volute or concentric. It is normally made of cast iron, but depending of the application could come with protective anti-corrosion coating, or could be made in special alloys for abrasive applications.
▪ SHAFT AND BEARING ASSEMBLY: The shaft is used to transmit the rotatory movement from the motor to the impeller. The shaft has Heavy-duty roller bearings that prevent its displacement in other directions and reduce vibration.
▪ SHAFT SLEEVE: Its function is to protect the shaft. The shaft sleeve is made of corrosion and abrasion resistant material.
▪ SEALS PACKAGE: The seals package prevents leakage of slurry into the motor and bearings. The seal package could be composed of lip seals, mechanical seals or hybrid seals.
▪ UPPER AND LOWER WEAR PLATES: These plates are located over and below the impeller. They are subject to wearing. The calibration of their clearances maximizes the efficiency of the submersible sand dredging pump.
▪ STRAINER: the strainer prevents the entry of large particles that could get stuck inside the impeller zone causing damage to the pump.
▪ AGITATOR: Allows the pump to pick up sediments, putting solids on suspension. The way it works, due to the design of the vanes, forces a continuous high pressure flow of liquid towards the sediments, this flow following the shape of a cone; transport the solids to the eye of the impeller achieving a high concentration of solids. The agitator also prevents solids from blocking the holes of the strainer.
Submersible Sand Dredging Pumps Applications:
▪ Dredging of Rivers and Canals
Submersible dredge pumps has been successfully used in the dredging of rivers to create or recover navigability, to remove contaminants from the riverbed and to restore the river shorelines.
▪ Dam Dredging
Dam dredging is a crucial operation to keep the capacity of the water reservoirs created by Dams, either for water sup-ply dams or for hydroelectric dams; since sedimentation build –up can affect their capacity and also affect the water quality.
▪ Dredging of Ports and Marinas
Because of sea currents and sedimentation in upstream effluents, the seabed of ports & marinas are frequently raised, making difficult the access of boats and vessels. Submersible dredge pumps are a convenient solution for harbor dredging along with our remote controlled mini-dredges and cable dredges.
▪ Dredging of Lakes and Ponds
Submersible dredge pumps are used for cleaning lakes and ponds, to remove silt and contaminants from the lakebeds; and for the dredging of tailings ponds in order to restore their capacity. Submersible dredge pumps can be equipped with accessories like cutter knife for aquatic plants, and water jets ring or cutters for compacted soil.
Centrifugal Sand Pump
Centrifugal sand pump is a general-purpose fluid machine widely used in industrial building systems. It has the advantages of a wide range of functions (including flow, pressure head and the properties of the conveying medium), small size, simple layout, simple operation, and low operating costs. Generally, the flow rate and pressure head of the selected centrifugal sand pump may be inconsistent with the requirements in the pipeline, or due to changes in production tasks and technical requirements, it is necessary to adjust the flow of the pump at this moment, which is essentially to change the centrifugal sand pump. work point. The operating point of the centrifugal sand pump is determined by the characteristic curve of the pump and the characteristic curve of the pipeline system. Therefore, changing any one of the characteristic curves can achieve the purpose of flow regulation. At present, the flow regulation methods of centrifugal sand pump mainly include regulation valve control, variable speed control, and parallel and series regulation of pumps. Because the principles of various conditioning methods are different, in addition to individual advantages and disadvantages, the resulting energy loss is also different. In order to seek the best, the least energy consumption, and the most energy-efficient flow conditioning method.
The primary method of pump flow regulation
(1) Change the pipeline characteristic curve
The easiest way to change the flow rate of the centrifugal sand pump is to use the opening of the pump outlet valve to control, and its essence is to change the position of the pipeline characteristic curve to change the pump’s operating point.
(2) Change the characteristic curve of centrifugal sand pump
According to the law of share and cutting, changing the speed of the pump and changing the structure of the pump (such as cutting the outer diameter of the impeller, etc.) can change the characteristic curve of the centrifugal sand pump, and then adjust the flow (change the pressure head at the same time). intention. However, for the pump that is already in operation, the method of changing the pump layout is not convenient, and because the layout of the pump is changed, the versatility of the pump is reduced. Although it is economical and convenient to adjust the flow at certain times, it is rarely used in production. Here we only analyze the method of changing the rotational speed of the centrifugal sand pump to adjust the flow. When changing the pump speed and adjusting the flow rate from Q1 to Q2, the pump speed (or motor speed) drops from n1 to n2, and the pump characteristic curve Q-H and the pipeline characteristic curve He=H0+G1Qe2 (pipeline characteristic curve when the speed is n2) The curve does not change) intersects at point A3 (Q2, H3), and point A3 is the new operating point after speed regulation and flow regulation. This conditioning method has a significant conditioning effect, is convenient, safe and reliable, can extend the service life of the pump, save electric energy, and other reduced speed operation can effectively reduce the NPSHr of the centrifugal sand pump, so that the pump is far away from the cavitation area. Reduce the possibility of cavitation in the centrifugal sand pump. The disadvantage is that changing the speed of the pump requires the frequency conversion technology to change the speed of the prime mover (usually a motor), the principle is complex, the investment is large, and the flow adjustment scale is small.
(3) Conditioning method of series and parallel connection of centrifugal sand pump
When a single centrifugal sand pump cannot satisfy the transportation mission, the parallel or series operation of the centrifugal sand pump can be selected. Using two centrifugal sand pumps of the same type in parallel, although the pressure head is not changed much, the total conveying flow is increased, and the total power of the parallel pumps is the same as that of a single pump; the total pressure when the centrifugal sand pumps are connected in series The head is enlarged, the flow rate is not changed much, and the total power of the series pump is the same as that of a single pump.
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