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This post was last edited by xwbfan on 2021-3-16 at 10:28. Before making a purchase, it is necessary to understand the source of water used in pure water production equipment; this is usually tap water, river water, or well water. It is also important to know the quality of this water, such as its conductivity, as well as the amount of water required for production and the quality of the water produced. These data are closely related to the prices and design plans of purified water equipment at http://www.zswater-sh.com/, and they also have a significant impact on a company’s daily production. Here are a few key points to keep in mind, for reference only: First, examine the appearance of the equipment. Generally, purified water treatment equipment produced by reputable manufacturers has a very polished appearance. 1. First, look at the frame: the welds are smooth with no unevenness. Overall, it gives off a sense of solidity. 2. Check the connections of the pipelines; ensure that these connections are horizontal and vertical ； Regarding the material of the piping, for high-pressure sections, stainless steel or UPVC pipe fittings are generally used. For stainless steel fittings, it’s necessary to check whether the surface finish is uniform; additionally, one of the unions should be opened to check its thickness ； For UPVC fittings, one should consider their color; they are generally dark gray with uniform shade. By opening one of the knots to check its thickness, it can be seen that fittings produced by reputable manufacturers are quite thick. 3. Are the high-pressure pump and raw water booster pump products from reputable manufacturers? 4. For the tanks in the preprocessing section, it is essential to choose those with a greater degree of thickness; some smaller manufacturers, in an effort to save costs, use thinner tanks, which can easily lead to problems. II. Ask about some details of the equipment: 1. The manufacturer and origin of the reverse osmosis membrane. 2. Does the desalination rate and water flux meet your requirements? 3. Control principle of the electronic control unit. 4. Is it designed based on actual conditions? 5. The design concept of pure water equipment. III. Are after-sales services adequate? 1. Is on-site installation and debugging provided? 2. Can operators be trained? 3. The efficiency of on-site repairs has a significant impact on the production process of enterprises. 4. Warranty period, usually 1 year. Regarding material assurance, it is necessary to ensure that all materials are traceable and consistent with the design plan; in terms of design, considerations should be given to ease of operation and the degree of automation. Of course, what is more important is the ability to produce a steady supply of pure water that meets water quality standards. IV. Inspection of piping fittings and instruments in purified water equipment 1. All dead corners in the pipelines are no larger than 3D, allowing for complete evacuation of the system. All horizontal pipelines shall have a slope of not less than 1% to ensure complete drainage during cleaning; the lowest point of the water production equipment shall be identified, and sanitary valves shall be installed. Diaphragm valves on horizontal pipes shall be installed at a 45-degree angle. 2. For the pipelines of the purified water system, the material used before the purified water storage tank is SUS304, while that used after the tank is SUS316L. The materials for the pipelines carrying injectable water and pure steam are also 316L; brand-name products are used for the pipelines and fittings. 3. Valves in contact with purified water, water for injection, and pure steam are all diaphragm valves; the valve discs are made of PTFE or EPDM. The installation angle ensures thorough drainage of any residual water. The valves for purified water can withstand pasteurization, those for water for injection can withstand disinfection with superheated water at 121°C, and the valves for pure steam can withstand saturated steam at 0.4 MPa. 4. From raw water to water for injection, sampling points and sampling valves must be installed at each stage where the water quality changes. All sampling points and sampling valves shall have a sanitary design, and all stainless steel pipes must undergo acid washing and passivation treatment. 5. All sealing ring materials are pharmaceutical-grade silicone rubber, and all components, pipes, gaskets, etc. that come into contact with disinfected hot water must be able to withstand the disinfection temperature. 6. Pipeline welding: The welds are smooth and even, without slag or burrs ； Welds on the equipment body are subjected to X-ray inspection at a specified percentage, as required ； The inner surfaces of all pipes in contact with raw water, pure steam, and water for injection shall be electropolished. 7. All instruments and probes that come into contact with purified water, water for injection, or pure steam must use sanitary-type connections; threaded connections are not permitted. 8. The flow meters at the return ports for purified water and water for injection are linked via frequency conversion with the distribution pumps. 9. Online conductivity analysis instruments have temperature compensation functionality; they must come with a calibration certificate, and they should be able to detect abnormal emissions when the conductivity levels exceed the specified limits. All other instruments must be calibrated, and calibration certificates must be provided. 10. All instruments, meters, valves, etc., installed on the circulating pipelines must be able to withstand the temperatures associated with the respective disinfection methods; after disinfection, their performance and lifespan must not be affected. The temperatures and durations they can withstand should be specified. In formal procurement, special attention should be paid to the design and material selection of equipment, as these directly affect its performance. Generally speaking, local manufacturers are given priority, as it is possible to visit the site to assess their capabilities in equipment design and manufacturing, and to determine the strength of the manufacturer based on visual inspection.