What are the methods of selecting acid and alkali resistant magnetic pumps?

　　Acid and alkali magnetic pumps on the market is very rich in product variety, different materials, different models, not to say thousands of models, at least you can count hundreds of models, so many acid and alkali magnetic pump models, which one can meet the use of demand?

　　Acid and alkali resistant magnetic pump selection method

　　1、Acid and alkali resistant magnetic pump process flow

　　Should be based on the process needs, reasonable determination of the pump flow and head and other basic parameters, general consideration of the normal wear and tear of the pump, speed changes, perhaps resulting in a decline in head, so the selection of magnetic pump pump head can be 2% to 5% margin, zui can not exceed 10%, the basic principle is to ensure that the pump operates in a highly efficient range, in addition, after the process can be obtained through the pump inlet state of the information for calculating the device cavitation margin used. Calculation of the device for the use of cavitation margin.

　　2, performance and energy savings at the same time

　　General mention of acid and alkali magnetic pump selection, most people first think of the pump material, in fact, in addition to the material, the power consumption of the device that is whether to save energy is equally important.

　　China's acid and alkali pump power consumption accounts for more than 21% of the national power consumption. Therefore, vigorously reduce the acid and alkali pump energy consumption, has great significance.

　　3, the corrosiveness of the medium and the selection of materials

　　Due to the complexity of chemical media varieties, nature, the need for accurate characteristics of the parameters, especially corrosivity, concentration, volatility, vaporization pressure, viscosity, density, etc., these properties and the selection of materials have a close relationship, not only metal materials, but also pay attention to the interaction of non-metallic materials and media.

　　4, the temperature of the medium

　　Temperature has a significant impact on the chemical pump structure selection, such as the pump body support, cooling (or thermal insulation) system planning, are closely related to the temperature of the medium to be transported, general acidity and alkalinity with FRPP material, the applicable temperature of 60 ℃ or less, strong acidic and alkaline media, high concentration of acidic and alkaline media, commonly used PVDF material, the applicable temperature of 90 ℃ or less, and has a good resistance to oxidation of fats and oils, resistance to strong acidic and alkaline properties PVDF material is commonly used, applicable temperature below 90℃, and has good resistance to grease oxidation, strong acid and alkali resistance.

　　5, select the appropriate flow, head

　　For the plastic chemical magnetic pump flow head, in the procurement, are technicians to determine a good, only need to tell the pump manufacturer. It should be noted that the technical staff to give the flow head is the actual use of the value, or the full value of the demand parameters, this must be communicated with the business, so as to avoid choosing the wrong model, to the scene can not be used. Can also be given according to the manufacturer's product specification of the performance curve diagram for selection, provided that really understand the technology.

　　6, the main shaft seal and its auxiliary system selection

　　According to actual case studies, unit failure caused by the spindle seal accounted for a high proportion of all failures, in some cases up to 30% ~ 40% or more, therefore, the selection of the spindle seal is critical. In addition to the physical and chemical properties of the medium, you need to understand two important parameters, the pressure of the seal chamber and the temperature of the medium in the seal chamber.

　　7, installation mode, caliber selection

　　This is generally synchronized with 2, the main purpose of this step is to meet the needs of the site installation, corresponding to the pipeline installation. So experienced business people in the use of all will ask clearly, is the new on-line products or replace the original old products. New on-line products are more selective and can be adjusted appropriately. Replacement of old products need to be the same caliber as the original product, so as not to affect the installation and use. If the caliber is not right, timely installation of piping to adjust the caliber, but also affects the performance of plastic chemical pumps, for the subsequent use of trouble.