MIXED FLOW PUMP

MIXED FLOW PUMP - Features, Applications and Advantages

Mixed Flow Pump

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The Sando Mixed Flow (SMF) series pumps are single-stage centrifugal pumps designed for handling large quantities of pure or contaminated liquids. These pumps are built with robust construction for a long working life and are known for their low energy consumption due to high efficiency. The pump shaft is precision-machined and seated in amply oil/grease lubricated, and protected by a shaft sleeve in the stuffing box area. The casing of the pump has integrally cast feet that transmit forces from the pipe work directly to the foundation, minimizing bending stresses on the rotor and ensuring optimal bearing life. These pumps can be driven by electric motors or diesel engines, with the pump's direction of rotation being anticlockwise from the driven end.

Special features of SMF pumps include their suitability for handling clear cold water with specific requirements for turbidity, chloride content, total solids, pH value, and viscosity. The pumps are designed with three/four vane impellers that are specially designed to pass solid or stingy material. Hand holes are provided in the casing and near the throat of the impeller for ease of maintenance. The pumps are available in horizontal and side discharge construction, as well as vertical dry pit or wet pit construction with motor directly mounted on the pump or at an elevation and connected through an intermediate shaft.

The pump casing is made of high-strength cast iron with ample section thickness for a large factor of safety over the maximum allowable working pressure. The casing is enclosed by a suction and stuffing box cover or head that is carefully machined for perfect alignment. Suction and discharge nozzles, as well as supporting feet, are cast integral with the casing, and flanges are drilled according to BS 10 table D, with drilling as per DIN/ASA possible upon specific request.

The impeller of SMF pumps is typically made of SS 304 (in standard pump) and is semi-open type with passages for the liquid to flow direct and unimpeded. The impellers are provided with balancing holes to counter the axial thrust and are dynamically balanced to reduce vibrations. Impellers made of other materials such as close-grained cast iron, bronze, phosphor bronze, Ni-cast iron, or cast steel are also available upon request.

The rotating assembly of the pump is supported on heavy-duty bearings mounted in a precision-bored frame, and the bearings are carefully sealed to exclude moisture and contaminants and retain lubricant. The stuffing box of the pump is designed extra deep and features a gland for easy replacement of gland packing. Packed stuffing box with lantern rings is the standard arrangement, but sealing by external fluid can also be provided upon special requirement.

The pump shaft is machined from high-quality steel and is designed to minimize deflection for reliable long-term service. It is protected by a sleeve in the stuffing box area. The direction of rotation of the pump is clockwise when viewed from the drive end.

Regenerate response

SECTIONAL DRAWING

Product Design Range

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Capacity -Q- : Up to 3600 m3/hr
Head : Up to 35 MLC
Pump Size - DN : 250 mm to 450 mm
Speed - N - : 580/670/ 960/1450/ rpm at 50 Hz
Temperature : Up to +150o C max.

Material Of Construction

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Graded Grey Cast Iron Bronze
Alloy Steel CD4MCU (Duplex Steel)
CF8M (SS 316) CF3 ( SS 304L ). D3MM ( SS 2205 )
CF3M (SS-316L) CF8 (SS 304) Carbon Steel(WCB)
Ni-Resist CN7M ( Alloy 20 )
R55 2-1 nicl
SS 904L Nickle & Ni-Alloys
Hasteloy- B/C CE3MN ( SS 2507 )

Features

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Precision machined pump shaft: The pump shaft is carefully machined from high-quality steel, designed to minimize deflection and provide reliable service. It is seated in amply oil/grease lubricated and protected by a shaft sleeve in the stuffing box area.
Integrally cast feet: The casing of the pump has integrally cast feet that transmit forces from the pipe work directly to the foundation. This ensures that the rotor is not subjected to bending stresses, resulting in optimal working life of the bearings.
Suitable for various liquids: Mixed flow pumps are normally recommended for handling clear cold water with specific conditions such as turbidity maximum 50 ppm (Silica Scale), chloride maximum 550 ppm, total solids 3000 ppm, pH value between 6.5 and 8.5, and specific gravity around 1.0. They can also be offered for liquids with viscosity up to 1000 SSU.
Impeller design: The impeller of mixed flow pumps is designed with three or four vanes (in standard pumps) to pass solid or stringy material. It is made of high-quality materials such as SS 304 (in standard pumps) and is semi-open type, allowing direct and unimpeded flow of liquid.
Construction options: Mixed flow pumps are available in various construction options, including horizontal and side discharge construction, vertical dry pit or wet pit construction, with motor directly mounted on the pump or at an elevation and connected through an intermediate shaft.
Casing strength: The pump casing is made of high-strength cast iron with ample section thickness to ensure a large factor of safety over the maximum allowable working pressure. It is enclosed by a suction and stuffing box cover or head that is carefully machined to assure perfect alignment. Flanges are drilled according to BS 10 table D, and drilling as per DIN/ASA is also possible upon specific request.
Bearing housing assembly: The rotating assembly of mixed flow pumps is supported on heavy-duty bearings mounted in a precision-bored frame. Bearings are carefully sealed to exclude moisture and contaminants and retain lubricant, ensuring smooth operation.
Stuffing box design: The stuffing box of mixed flow pumps has an extra deep design and features a gland to simplify replacement of gland packing. Packed stuffing box with lantern rings is the standard arrangement, but sealing by external fluid can also be provided upon special request.
Direction of rotation: Mixed flow pumps have a clockwise rotation when viewed from the drive end, but can also be customized to rotate in the opposite direction (anticlockwise) when driven by a diesel engine as the prime mover.

Application

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Water supply systems: Mixed flow pumps are commonly used in municipal water supply systems to transport water from sources such as rivers, lakes, or reservoirs to water treatment plants or distribution networks.
Irrigation: Mixed flow pumps are used in agricultural irrigation systems to deliver water to fields for crop irrigation, particularly in situations where large flow rates and moderate heads are required.
Drainage: Mixed flow pumps are used in stormwater and flood control systems to pump excess water from low-lying areas or basements to prevent flooding.
Wastewater treatment plants: Mixed flow pumps are used in wastewater treatment plants to transport wastewater from various treatment processes, such as screening, sedimentation, or biological treatment, to further treatment or discharge.
Industrial applications: Mixed flow pumps are used in various industrial processes that require pumping large volumes of water or other fluids, such as cooling water systems, process water circulation, or dewatering in construction sites

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