German ANDRITZ pump ANDRITZ model ANDRITZ price

ANDRITZ pumps generate centrifugal force through impeller rotation, acting on the liquid to impart pressure energy and velocity energy within the impeller. Part of this velocity energy is then converted into pressure energy within the pump casing or diffuser to transport the liquid. They are generally classified by structural characteristics: By operating pressure: low-pressure pumps with pressure below 1MPa; medium-pressure pumps with pressure between 1 and 6.5MPa; high-pressure pumps with pressure above 6.5MPa. By number of working impellers: single-stage pumps with only one impeller on the pump shaft; multi-stage pumps with two or more impellers on the pump shaft. By impeller inlet method: single-suction pumps with inlet on one side; double-suction pumps with inlets on both sides. By pump casing joint form: horizontal split pumps with the split line passing through the axis; vertical joint pumps with the joint surface perpendicular to the axis. By pump shaft position: horizontal pumps with the shaft in a horizontal position; vertical pumps with the shaft in a vertical position. By method of directing impeller discharge to the discharge chamber: volute pumps where discharge enters directly into the spiral-shaped pump casing; diffuser pumps where discharge passes through a diffuser to the next stage or to the outlet pipe. By installation location: submerged pumps with the pump body underwater and the driver above water; submersible pumps with both the drive motor and pump body underwater; inline pumps directly connected between pipes; deep well pumps installed in underground deep wells. By medium application: clean water pumps (including boiler feed pumps, circulation pumps, condensate pumps, etc.); slurry/impurity pumps (including sewage pumps, mud pumps, slag slurry pumps, gravel pumps, material slurry pumps); petrochemical process pumps (including chemical pumps, process pumps, barrel pumps, oil pumps, etc.); vacuum pumps (including liquid ring vacuum pumps, vane vacuum pumps, etc.).

ANDRITZ pump construction

The basic construction of a centrifugal pump consists of eight parts: impeller, pump casing, pump cover, water deflector ring, pump shaft, bearing, sealing ring, packing gland, and axial force balance device. 1) The impeller is the core component of the centrifugal pump, featuring high rotational speed and high output force. 2) The pump casing, also known as the pump shell, is the main body of the water pump. It provides support and fixation and connects to the bracket holding the bearings. 3) The pump shaft connects to the motor via a coupling to transmit the motor's torque to the impeller, making it the primary component for transmitting mechanical energy. 4) The sealing ring, also known as the leakage reduction ring. 5) The packing gland mainly consists of packing, preventing water inside the pump from leaking out and air from entering the pump. It maintains the vacuum inside the water pump. When heat is generated by friction between the pump shaft and the packing, water must be injected into the water seal ring via the water seal pipe to cool the packing. 6) Axial force balance device. During centrifugal pump operation, liquid enters the impeller at low pressure and exits at high pressure, creating unequal pressure on both sides of the impeller. This generates an axial thrust towards the inlet, which can cause axial movement of the rotor, leading to wear and vibration. Therefore, axial thrust bearings should be installed to balance the axial force.

ANDRITZ pump maintenance

Centrifugal pump shutdowns are primarily caused by mechanical seal failure. Failure mostly manifests as leakage, with the following causes: 1) Leakage at the sealing faces of the stationary and rotating rings. Main causes include: end face flatness and roughness not meeting requirements, or surface scratches; particulate matter between the end faces preventing uniform operation; improper installation or incorrect method. 2) Leakage of the compensation ring O-ring. Main causes include: deformation of the gland, uneven preload; incorrect installation; O-ring quality not meeting standards; incorrect O-ring selection. Practical use indicates that the most common failure point for sealing elements is the end faces of the rotating and stationary rings. Cracking of the mechanical seal rotating and stationary ring end faces is a common failure phenomenon, mainly due to: 3) Excessive gap at the sealing face during installation, preventing the flush fluid from removing heat generated by the friction pair in time; flush fluid leaking through the sealing face gap, causing overheating and damage to the end faces. 4) Vaporization and expansion of the liquid medium, forcing the two end faces apart due to vaporization expansion forces. When the two sealing faces are forced back into contact, the lubricating film is destroyed, causing overheating of the end face surfaces. 5) Poor lubricity of the liquid medium, combined with excessive operating pressure, causes asynchronous tracking rotation of the two sealing faces. For example, in a high-speed pump with a rotational speed of 20445r/min, a sealing face center diameter of 7cm, the linear speed reaches 75 m/s after the pump starts. If one sealing face lags and fails to track the rotation, instantaneous high temperature causes damage to the sealing face. 6) Blockage of the seal flush fluid orifice plate or filter screen, resulting in insufficient water flow and mechanical seal failure.

ANDRITZ pump usage precautions

1) Dry running is prohibited. Do not adjust the suction inlet to reduce flow rate. Operation at excessively low flow rates is prohibited. 2) Monitor the operation process. Completely prevent packing box leakage. Use new packing when replacing the packing box. 3) Ensure sufficient flush water flow for the mechanical seal. Excessive water flow is prohibited for water-cooled bearings. 4) Do not use excessive lubricant. 5) Inspect at recommended intervals. Establish operation records, including operating hours, packing adjustment and replacement, lubricant addition, and other maintenance measures and times. Regularly measure and record centrifugal pump suction and discharge pressure, flow rate, input power, flush fluid and bearing temperatures, and vibration levels. 6) The centrifugal pump host relies on atmospheric pressure to lift water from a lower level to a higher level. Since atmospheric pressure can support a water column of only about 10.3m, the centrifugal pump host cannot operate if it is 12 meters above the water surface.

Weidou Intelligent Technology specializes in selling German ANDRITZ centrifugal pumps, ANDRITZ gear pumps, ANDRITZ diaphragm pumps, ANDRITZ centrifugal pumps, ANDRITZ piston pumps, ANDRITZ vacuum pumps, ANDRITZ screw pumps, ANDRITZ submersible pumps, ANDRITZ peristaltic pumps, ANDRITZ lubrication pumps, ANDRITZ vane pumps, ANDRITZ metering pumps, ANDRITZ hand pumps, ANDRITZ drum pumps, ANDRITZ cam pumps, ANDRITZ booster pumps, ANDRITZ liquid pumps, ANDRITZ air pumps. Original German imports. Welcome inquiries and orders from users.