Sewage flowmeter selection tips

How to choose a sewage flowmeter? What are the principles and standards for its selection? Everyone's vague concept, many people still stay in the original ancient times, isn't it just a flowmeter for measuring sewage? Still need to choose? The key significance of selection is not to select for the sake of selection. The significance of selection is to better match the actual needs of your site conditions, and to better serve the long-term, stable and effective operation of sewage flowmeters. This is the choice. For the purpose of type, Kaidi Instrument will share with you some practical tips for the selection of sewage flowmeters. The principle and standard for lining selection of sewage flowmeters are to choose sewage flowmeters according to on-site working conditions. The index of its selection is what is the medium of your pipeline? For example, if the medium is corrosive, the lining should be selected to be PTFE, which is consistent. The lining is shown in Table 1. The quality of the lining selection is directly related to the use of the flowmeter. Table 1 The main properties of the lining material, the maximum medium temperature, the applicable range, the integrated separation type polytetrafluoroethylene (F4) is a kind of plastic with very stable chemical properties. an organic solvent. Not resistant to corrosion by chlorine trifluoride, high temperature chlorine trifluoride, high flow rate liquid fluorine, liquid oxygen and self-oxygen. 70℃100℃250℃ (special order required) 1. Strong corrosive medium such as concentrated acid and alkali. 2. Hygienic medium. Polyperfluoroethylene propylene (F46) is the same as F4, and its wear resistance and negative pressure resistance are higher than F4. The upper limit of the applicable temperature of polyfluoroethylene (Fs) is lower than that of polytetrafluoroethylene, but the cost is also lower. 80 ℃ polychloroprene rubber 1. It has excellent elasticity, high breaking force and good wear resistance. 2. It is resistant to the corrosion of general low-concentration acid, alkali, and salt media, and is not resistant to the corrosion of oxidizing media. 80°C 120°C (special order required) water, sewage, weak abrasive slurry. Polyurethane rubber 1. Strong wear resistance. 80 ℃ neutral and strong abrasion ore slurry, coal slurry, mud 2, poor corrosion resistance. The medium of the electrode selection pipeline is equivalent to the electrode. If the medium of your pipeline is acid, if you choose an ordinary electrode, the sewage flowmeter will be scrapped, so the selection of the medium depends on your medium and the electrode. The correct selection of electrodes is shown in Table 2. Table 2 Electrode material corrosion resistance and wear resistance Stainless steel 0Crl8Nil2M02Ti is used for weakly corrosive media such as industrial water, domestic water, sewage, etc. It is suitable for petroleum, chemical, steel and other industrial sectors, municipal, environmental protection and other fields. Hastelloy B has good corrosion resistance to all concentrations of hydrochloric acid below the boiling point. Hastelloy C is resistant to corrosion by non-oxidizing acids, such as nitric acid, mixed acid, or a mixed medium of chromic acid and sulfuric acid, and also resistant to oxidizing salts such as: Fc+, Cu+ or containing other oxidants, such as higher than normal temperature. Corrosion of hypochlorite solution and seawater Titanium is resistant to corrosion by seawater, various chlorides and hypochlorites, oxidizing acids (including oleum), organic acids and alkalis. It is not resistant to the corrosion of relatively pure reducing acids (such as sulfuric acid, hydrochloric acid), but if the acid contains oxidants (such as nitric acid, Fc+, Cu+), the corrosion is greatly reduced. Tantalum has excellent corrosion resistance similar to glass. In addition to hydrofluoric acid, fuming sulfuric acid, and alkali, it is almost resistant to corrosion by a chemical medium (including boiling point hydrochloric acid, nitric acid, and sulfuric acid below 150 °C). Diao in alkali; corrosion resistance. Platinum/titanium alloys are resistant to almost all chemical media, but are not suitable for aqua regia and ammonium salts. Stainless steel coated tungsten carbide for non-corrosive, highly abrasive media. Note: Due to the wide variety of media, and their corrosiveness is affected by complex factors such as temperature, concentration, flow rate, etc., this table is for reference only. Misleading model selection With the development of the Internet, there are various models marked on the Internet. Many merchants name the model after their own company. The unified model of sewage flowmeter is 'LDE' followed by various calibers. Some merchants do not ask for the model for economic benefits. , as long as you provide the caliber, you can report the price, and some merchants also mislead customers, saying that the sewage flowmeter can measure all media, exaggerating the function of the flowmeter as shown in Figure 1. Figure 1 Summary: Good selection is very important, but the bottom line of selection is to choose a sewage flowmeter according to the actual working conditions on site.
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