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Stainless steel water tank production specification requirements and maintenance methods
1. The production of stainless steel water tanks and installations should meet the requirements of GZB 5749-1985 "Hygienic Specifications for Career Drinking Water" and "GZB 17051-1997 Hygienic Standards for Secondary Water Supply Equipment" GB50015-2003 Design Standards for Water Supply and Drainage Construction
2. Stainless steel water tanks should be made of stainless steel SUS444 or 304 specification materials. Top, side, bottom steel plate thickness must not be lower than the national standards.
3. All bolts, nuts, and gaskets are made of stainless steel. The information used for the sealed interface should be chemically stable, non-toxic, and do not affect the water quality of the tank.
4. The water tank should be equipped with active cleaning and disinfection to reach the domestic first-class. The top of the box is blocked, and vents should be installed with activated carbon adsorption.
5. Supply tank drawing and accounting book, tank bottom map, product copy sheet.
6. There is no overflow or leakage in the additional capacity limit.
7. Welds should be solid and free of imaginary welds, sag, air holes, no deformation, dislocation, solid and reliable, streamline appearance is beautiful, not sturdy.
8. Different color stains must be thoroughly eliminated. After algae irrigation, algae should not grow for a long time. The cleanliness should be satisfied with GZB 5749-1985 "Hygienic Specifications for Career Drinking Water".
9. It should be equipped with liquid level display, controller, float level regulator, and supply interface for BA.
10. Produce a production permission certificate issued by a qualified health bureau. Provide two copies of the certificate of copy of the business license, the quality of the company, the quality certification, and the entrusted legal person.
11. The pressure test declaration and pass certificate for the supply of forming plates were confirmed by the material physical and chemical tests.
12. The supply of on-site assembly construction process is clarified.
13. The dimensions of inlet and outlet pipes, overflow pipes, sewage pipes and bypass pipes shall be determined according to the actual site requirements.
Stainless steel tank application clarification
1. Stainless steel water tanks are used as secondary equipment for the storage of life water. They can only install career water (fire fighting water) and cannot contain hydrochloric acid, sulfuric acid or liquids with large acidic and alkaline contents.
2. During the use of the water tank, do not place other heavy equipment at the top of the tank. Do not use any hard objects to tap or flush the layout and fittings of the tank. There are problems to tell the manufacturer's skill maintenance personnel and maintain the welding staff. The requirements are specialized. Professionals in the argon arc welding task must lose water during maintenance.
3. The maintenance personnel will check the usage status of the main parts and accessories inside the water tank on a monthly basis. Problems will be reported to the manufacturer in real time.
4. Do not open the water tank inlet cover to avoid secondary pollution. The water tank should be cleaned and disinfected 1-2 times per year.
[Rust steel tank features:]
1. The stainless steel material has stable physical and chemical properties, no pollution to water quality, and guarantees clean and hygienic water quality.
2, the tank is high strength, light weight, clean appearance, beautiful and elegant.
3, smooth and beautiful surface, easy to clean.
4, superior corrosion resistance, good sealing performance.
5, large impact resistance, strong seismic performance.
[Nine Features of Combined Stainless Steel Water Tank]
1 The modular stainless steel water tank is assembled and welded by a single square stamped stainless steel plate of 1*1, which is far away from the modern construction and has a sense of the times.
2 The entire water tank is blocked, and the imported stainless steel plate is lubricated, so it does not require too much cleaning in daily life, it is not easy to attach algae, and the sediment is washed and washed.
3 Due to the use of manual assembly, the types of tanks and their shapes can be based on the shape of the house, and they can be assembled into the required I-shaped, L-shaped, Z-shaped and so on.
4 The products are commonly used for the storage of liquids in hotels, residential areas, commercial houses, and production enterprises, such as water storage, beverage storage, medicine, environmental protection and chemical industry.
5 The quality food grade stainless steel SUS304 greatly extends the service life of the water tank and can better avoid secondary pollution of water quality.
6 Structure A common, reasonable and sensitive plate-shaped design can be used for containers of various sizes.
7 The high-strength stamping plate and the average stainless steel bar spreading in the box make the pressure on the box reasonable. Specification stamping plate 1000 × 1000, 1000 × 500, 500 × 500mm 2000 × 2000 optional fitting site assembly welding, without lifting equipment.
8 The high-quality stamping process not only covers the maximum limited pressure requirement of the box, but also reduces the thickness of the data, satisfying the aesthetic requirements of the box.
9 The price of the modular stainless steel water tank is close to the price of the FRP water tank and decreases with the addition of the volume. The price of the special flood water tank is close to the price of the cement tank and can be used as a permanent storage tank.
The combined stainless steel water tank is currently the construction industry's most commonly used stainless steel water tank alternative, the combined stainless steel water tank is made of imported USU304 stainless steel plate pressed and assembled, with strong water storage capacity, high water tank strength, water tank itself Light weight, corrosion resistance, oxidation resistance, fine appearance, beautiful appearance, long service life, convenient post-protection, etc.
Stainless steel tanks have excellent characteristics such as common strength, high wear resistance, superior anti-corrosion function, and low rust. Therefore, it is widely used in the chemical industry, food machinery, mechanical and electrical industry, environmental protection industry, household appliances industry and home decoration, finishing industry, giving people the feeling of sublime.
The prospects for the use of stainless steel water tanks will become wider and wider, but the use of stainless steel water tanks has been carried out to a large extent on the level of its apparent disposal skills.
1 stainless steel water tank commonly used exterior disposal methods
1.1 Introduction to Stainless Steel Tanks
1.1.1 Stainless steel water tank The primary component: Commonly contains (Cr), nickel (Ni), molybdenum (Mo), titanium (Ti) and other high-quality metal elements.
1.1.2 Often see stainless steel water tank: stainless steel water tank, containing Cr ≥ 12; nickel stainless steel water tank, containing Cr ≥ 18, containing Ni ≥ 12.
1.1.3 Classification of microstructures from stainless steel tanks: There are austenitic stainless steel tanks, for example: 1Cr18Ni9Ti, 1Cr18Ni11Nb, Cr18Mn8Ni5. Martensitic stainless steel water tanks, for example: Cr17, Cr28, etc. Commonly referred to as non-magnetic stainless steel water tank and magnetic stainless steel water tank.
1.2 often see stainless steel tank disposal methods
Commonly used stainless steel water tank disposal skills have the following disposal methods: 1 the appearance of natural bleaching treatment; 2 external mirror light treatment; 3 appearance coloring treatment.
1.2.1 The appearance of the nature of the bleaching treatment: stainless steel water tank in the process of processing, through the coil plate, tie edge, welding, or through the appearance of artificial fire heating heat treatment, the occurrence of black oxide skin. This strong gray-black oxide scale is mainly NiCr2O4 and NiF two kinds of EO4 components, the former commonly used hydrofluoric acid and nitric acid for strong erosion method to remove. However, such an approach is costly and polluting. It is harmful to the human body and is more aggressive and gradually reduced. There are currently two main approaches to oxide scale disposal:
(1) Sandblasting (Pills) Method: First, the method of spraying micro glass beads is adopted to remove the appearance of black oxide scales.
(2) Chemical method: Use a non-polluting pickling paste and a non-perishable cleaning solution with inorganic additives. Then arrive at the stainless steel tank nature bleaching disposal target. After a good deal of treatment, it looks like a dull radiance. This approach is more suitable for large, complex products.
1.2.2 Stainless steel water tank surface mirror light treatment methods: According to the complex level of stainless steel water tank product and the user requirements can be distinguished using mechanical polishing, chemical polishing, electrochemical polishing and other methods to reach the mirror gloss.
The advantages and disadvantages of these three methods are as follows: Appearance coloring treatment: Stainless steel water tank coloring not only pays for the various colors of stainless steel water tank finished products, but also adds the product's pattern type, and improves the wear resistance and corrosion resistance of the product.
[Stainless steel tank coloring methods are as follows:]
(1) chemical oxidation coloring method;
(2) electrochemical oxidation coloring method;
(3) ion deposition oxide coloring method;
(4) High temperature oxidation coloring method;
(5) Gas phase cracking coloring method.
The various methods are briefly outlined as follows:
(1) Chemical Oxidation Coloring: It is the color of the film formed by chemical oxidation in a specific solution, including dichromate method, inclusion sodium salt method, sulfurization method, acid oxidation method, and alkaline oxidation method. Ordinary "INCO" is used more often, but if it is necessary to guarantee the consistency of a batch of products, it is necessary to use the reference electrode for control.
(2) Electrochemical coloring: It is the color of the film formed by electrochemical oxidation in a specific solution.
(3) ion deposition oxide coloring chemical method: is the stainless steel water tank workpiece on the vacuum coating machine for vacuum evaporation plating. For example, titanium-gold watch cases and watch bands are usually golden yellow. This method is suitable for a large number of product processing. Due to the large investment, the cost is high, and the products in small quantities are not worthwhile.
(4) high-temperature oxidation coloring method: is in a specific molten salt, immersed in the workpiece to adhere to the inevitable process parameters, so that the workpiece constitutes an inevitable thickness oxide film, and appear all kinds of disparate brilliance.
(5) Gas phase cracking coloring: It is more complex and less used in industry.
1.3 Treatment options
Which method is used for the disposal of stainless steel water tanks, according to the product structure, material, and external requirements for disagreement, use appropriate methods for disposal.
2 stainless steel tank parts rust occurs often seen
2.1 Chemical attack
2.1.1 External contamination: Oil, dust, acid, alkali, salt, etc. attached to the external surface of the workpiece are converted into erosion media under certain conditions, and chemical reactions occur with certain components in the stainless steel tank parts, causing chemical corrosion and rust.
2.1.2 Scratch on the exterior: All kinds of scratches damage the passivation film, so that the maintenance of the stainless steel water tank can be reduced. It is easy to react with chemical media, and chemical corrosion occurs and rust.
2.1.3 Cleaning: Clean and dirty after pickling and passivation to form residual liquid and directly erode the stainless steel tank parts (chemical erosion).
2.2 Electrochemical erosion
2.2.1 Carbon Steel Pollution: The scratched and eroded media formed by the contact with the carbon steel parts constitute the primary battery and electrochemical corrosion occurs.
2.2.2 Cutting: Adsorption and erosion of easily rusted substances such as slag, splash, etc. The medium constitutes a primary battery and electrochemical rot occurs.
2.2.3 Roasting school: The components of the heated area of ​​the flame and the metallographic structure change and become uneven, and the erosion medium constitutes the primary battery and electrochemical erosion occurs.
2.2.4 Welding: physical defects in the welding area (undercuts, pores, cracks, unmelted, incomplete penetration, etc.) and chemical defects (greater grain size, chromium-depleted grain boundary, segregation, etc.) and the erosion media constitute the primary battery and occur Electrochemical erosion.
2.2.5 Material: Chemical defects (uneven composition, S, P impurities, etc.) and appearance physical defects (loose, blisters, cracks, etc.) of the stainless steel tank material are conducive to the formation of primary cells with the erosion media and electrochemical erosion.
2.2.6 Passivation: The result of pickling passivation is not good. The appearance of passivation film of stainless steel water tank is uneven or thin, and it is easy to constitute electrochemical erosion.
2.2.7 Cleaning: The retained pickled and passivated residual liquid and the stainless steel water tank are chemically attacked and the stainless steel water tank components constitute an electrochemical attack.
2.3 stress concentration is easy to form stress erosion
In short, stainless steel water tanks are eroded because of their extraordinary metallurgical structure and appearance of passivation film, making it difficult to respond to chemical reactions with media in ordinary circumstances, but not under any premise can not be eroded. Under the premise that erosion media and incentives (such as scratches, splashes, slags, etc.) exist, stainless steel water tanks can also erode with the chemical and electrochemical reactions to the slow-onset attack of erosion media, and the corrosion rate under certain preconditions is quite fast. Occurrence of rust, especially pitting and crack erosion. The erosion mechanism of stainless steel tank parts is primarily electrochemical erosion.
Stainless steel tank production specifications and maintenance methods
Stainless steel tanks have excellent characteristics such as common strength, high wear resistance, superior anti-corrosion function, and low rust. Therefore, it is widely used in the chemical industry, food machinery, mechanical and electrical industry, environmental protection industry, household appliances industry and home decoration, finishing industry, giving people the feeling of sublime.