How to properly use high viscosity pump

How to properly use high viscosity pump

Rotor pumps that deliver high-viscosity fluids should deliver the most flow at lower power consumption, less leakage, and greater pressure. In determining the media to be transported, it should strictly follow the provisions of the product manual, try to use the manufacturer recommended fluid medium, and pay attention to consider the system operating temperature range. When you want to use in a wide range of temperature, the viscosity of the conveying medium should be higher.
When transporting liquids with high viscosity or when the system is operating in a cold environment, it must be ensured that the transport medium will flow smoothly. Many oils contain waxy components that can crystallize easily at low temperatures. The pour point for the delivery medium should be below the expected minimum operating temperature. In addition, the medium to be transported must be compatible with the rubber, such as seals, gaskets and hoses in the system. If the two are incompatible, the media must be re-defined.
The transport medium is not only an intermediary for energy transfer but also a lubricant, seal and heat transfer medium. High fluid viscosity can increase internal friction, reduce output power, waste energy, and create excessive system temperatures. High Viscosity Rotor Pumps "
High-viscosity pump outlet pipe should also be set safety valves and other protective devices, so that once the pump outlet channel blockage, you can open the relief valve relief. For the need for positive and negative high-viscosity pump, the import and export pipelines are required to set the safety valve.
1, the working pressure of the selected pump rated pressure refers to the maximum allowable pressure pump continuous work, and its working pressure is determined by the external load, the life of the pump and its working pressure is directly related. For infrequent work of the rotor pump, the working pressure can be taken as the rated pressure of the pump, taking into account the different product quality, it is best to reduce the rated pressure of 20% to 30%. For the rotor pump that often works under higher pressure, the working pressure should be 1 ~ 2 pressure levels lower than the rated pressure of the pump. Petrochemical equipment is often 24 hours continuous operation, when the pump working pressure should be made much lower than the rated pressure, and working speed should be lower than the rated speed. If the high-viscosity pump working pressure is adjusted too high, it will run the rotor pump under overload.
2, the installation and commissioning High-viscosity pump bearing or flange and its drive motor should be based on a common installation foundation, flange, or bearings are required to have sufficient rigidity to reduce the rotor pump vibration generated during operation and noise. Motor and rotor pump shall be connected with flexible coupling, concentricity less than 0.1 mm, inclination angle not greater than 1 degree. Do not use hammer hammer when installing the coupling, so as not to damage the rotor pump gear and other parts. If the pulley, sprocket and other drive support bracket should be set to prevent the driving gear bearing radial force.
Tighten the rotor pump, motor ground screw, the screw force should be uniform, reliable connection. When turning the coupling by hand, you should feel that the rotor pump can be easily rotated without any abnormalities such as jamming before piping can be performed. High-viscosity pump suction pipe diameter should be large enough, and to avoid a narrow channel or sharp turn, reduce elbow, remove unnecessary valves, accessories, as far as possible to reduce the pump installation height, shorten the length of the suction pipe to reduce pressure loss . Pipe joints and other components of the seal should be good to prevent air intrusion, thereby controlling the occurrence of cavitation and cavitation.
Before starting the operation, fill the housing of the rotor pump with liquid to be transported for safe start-up. If the ambient temperature is below the freezing point, preheat the pump with heat steam beforehand and then start the rotor pump . The direction of rotation of the rotor pump with inlet and outlet port line. If the rotor pump is operated for the first time or used for a long time after it is idle, it is best to run for about one hour at no-load or light-load conditions. If abnormal temperature rise, leakage, vibration and noise are detected in advance during running-in, the machine should be shut down for inspection.
High-viscosity pump outlet pipe should also be set safety valves and other protective devices, so that once the pump outlet channel blockage, you can open the relief valve relief. For the need for positive and negative high-viscosity pump, the import and export pipelines are required to set the safety valve.
3. Noise Problems In fluid delivery systems, rapid changes in flow velocity, flow and pressure, rupture of bubbles, and alternating loads are common causes of noise. Rotor pumps that deliver high viscosity liquids are the main source of system noise .
Reasonable determination of the rotor pump speed, gear and shaft rotation to avoid meshing resonance frequency, to prevent increased noise. Because when the meshing frequency close to the natural frequency of the gear train prone to resonance. The use of appropriate vibration isolation technology can prevent the transmission of vibration to the adjacent structure. To this end, the rotor pump and the drive motor should be connected by a flexible coupling and mounted on the same base plate to ensure coaxiality. The base plate is mounted on the elastic support to further improve the vibration isolation effect. It is an effective way to control the noise of high-viscosity pump by setting an expansion cavity or accumulator on the outlet pipe of the rotor pump to absorb the pressure pulsation in the pump or sudden pressure change in the buffer pipe.
advantage:
(1) delivery of liquid smooth, no pulsation, vibration, low noise.
(2) has a strong self-priming performance.
(3) The correct selection of parts materials, can transport a variety of corrosive media, the use of temperature can be 200 ℃.
(4) the same internal and external rotor rotation, wear small, long service life.
(5) pump speed and flow rate as a linear function, may be appropriate to change the speed to change the pump flow.
(6) Especially suitable for the delivery of high viscosity pump consistency media.

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