The application of the screw pump and use requirements

Screw pump is generally divided into iron screw pump and the stainless steel screw pump, screw pump with high lift, suitable for conveying the advantage of mud, was deeply loved by the user, not any high-lift screw pump can be used in all the circumstances, so what is situation for selection of screw pump? The carbon paste of the screw pump, the use of processing gold mine. rotor and stator will be changed frequently, due to abrasion mechanical seal would also be affected. Screw centrifugal pump can be used as an alternative, it can effectively pumping abrasive slurry. Screw centrifugal pump prices are competitive, 2 - Three adjustment to the increased tolerance due to abrasion, and thus reduce the cost of spare parts. Second, the fluid flow stop what will happen? In the event of a plan or unplanned outage, stay inside the pump flow experience what happens? Or, more importantly, in the pump after the restart, what happens? , of course, the type of fluid is very important, suspension, thixotropic fluid or possible solidification fluid if residue within the pump, it is easy to damage the pump. Therefore, in the selected pump working mechanism, pumping the fluid is also very important. One instance is wastewater treatment used in some types of pump whitewash. When the pump stop, lime will begin to precipitation and accumulation, cause congestion. Peristaltic water pump can & other; Decomposition & throughout; Hose lime coating on the inner diameter, and because of the open flow path and the pumping principle, can be more easily pumping may precipitate any fluid. Three, food the long fiber pulp material: screw centrifugal pump is desirable. If an unplanned outage happens in the process, liquid will deposit? In rapid hardening of the grouting material, for example. Even if stop for a few minutes may need a long time to clean up and restart the pump. In some cases even worse: need to change a new pump! If you have problems in the process of, configure a spare pump and prepare some key spare parts may be more important. If these can't solve the problem, need to check the pump's working mechanism, to see if suitable for current work flow and processing parameters. Other such as pump can't water, dry run, boot process is to determine the key factors to consider when the water pump selection. Four, whether can use the same pump is another fluid? In many cases, the answer is yes. But in reality, is only applicable to & other; The same type & throughout; The fluid flow. Have obvious examples show that the two different fluid cannot use the same pump only. Such as, can't deal with solvent with diaphragm pump, at the same time, to deal with abrasive sludge containing long fiber. If two fluid many similar physical properties, such as viscosity, specific gravity, vapor pressure, solid content and temperature, so only two liquids can use the same pump for pumping. Another limitation is that the pump and the discharge of flow must not exceed the allowed range pump. Chemical pump still need tolerance, especially the strong acid and strong alkali. will be required to deal with a variety of chemicals, in most cases, is at room temperature, the consistency of water. Pneumatic double diaphragm ( AODD) efficiency will be higher than that of centrifugal pump, because the proportion of possible severe changes. In addition, due to the fluid using IBC ( Complex intermediate bulk containers) Delivery, may occur when fluid gradually lose the dry run. AODD pump suitable for pumping a variety of fluid in principle. Centrifugal pump is generally only pumping a fluid. Set the parameters of the pump according to the fluid. In order to avoid cavitation and vibration, it is necessary to reassess NPSH ( Cavitation) Value and the curve of the pump. Five, if there are any pollutants or foreign body into the pump body, what will happen? Pollutants such as more than a certain diameter solid or may lead to elements of liquid chemical composition change will lead to pump a gradual, sometimes even catastrophic failure. Because of water pollution into the pipeline pump, may produce dangerous reaction. Only for sulfuric acid and hydrogen, for example: due to the high temperature oil oxidation corrosion, pollution and damage is not only a pump, pipes and containers. If the oil pump parts cannot tolerate high temperature oxidation of be affected with damp be affected with damp, even there is a risk of explosion. If there is a foreign body within the fluid entering the pump, can be very deadly, in particular, when the hardness and size of the foreign body part was not enough to affect the mechanical operation. When pumping the liquid composition, viscosity, contain to measure, temperature and density change is bigger, it is important that when choosing a pump, want to consider possible operating mode changes. Common example is replaced with screw centrifugal pump or peristaltic pump rotating vane pump or single screw pump, due to fluid with open channel, this kind of pump can handle wear and tear 'at the same time, viscosity and unexpected large fibrous solid. When expectations have larger solid content, viscosity and density fluctuations, screw centrifugal pump is a relatively safe choice. Such as: contain large bone slaughterhouse waste, through spiral centrifugal pumps there is no problem.
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