Common faults and treatment methods of stainless steel welded water tanks

Dec 09, 2022

Stainless steel welded atmospheric water tanks are widely used in the adjustment of building water supply, storage tanks, hot water insulation storage of hot water supply systems, and condensate tanks. It solves the defects of traditional water tanks such as difficulty in production and installation, poor anti-corrosion effect, short service life, easy leakage of prefabricated water tanks, and easy aging of rubber strips. It has the advantages of high manufacturing standardization, flexible manufacturing, no lifting equipment, and no water pollution.

Common faults and treatment methods of stainless steel welded water tanks

Because industrial and domestic water generally contain chloride ions (Cl-), metal hot water containers are always in a corrosive environment containing Cl-water below 80 °C all year round, and local corrosion is prone to occur and its service life is limited. Localized corrosion (electrochemical corrosion) is much faster and more dangerous than uniform corrosion (chemical corrosion), often leading to leaky failures. In the water medium containing Cl-, the weak link of the stainless steel water tank that is prone to corrosion is the welding zone. Because the zone has been subjected to high temperature heating, the structure and performance are deteriorated, and the corrosion resistance is also reduced.

The stainless steel water tank is generally made of Cr stainless steel. Because the material does not contain nickel, corrosion and leakage problems in the welding parts of the water tank during use are more common. The traditional repair welding method is more difficult, and may cause greater damage due to thermal stress; brushing epoxy corrosion-resistant materials may cause cracks, peeling, etc. due to the influence of surface adhesion and expansion coefficient. The phenomenon aggravates the corrosion again. At present, the more effective methods mostly use polymer composite materials, among which the application of Meijiahua series is relatively mature. For different equipment, different operating conditions, and different forms of corrosion and leakage, the use of corresponding technical products can quickly, simply and effectively protect equipment, especially due to the comprehensive properties of polymer composite materials such as chemical corrosion resistance and bonding performance , to avoid the adverse effects of traditional repair welding repair and traditional corrosion-resistant material protection, so that the service life of repaired equipment even exceeds that of new equipment, fundamentally solve the cause of corrosion and leakage, help enterprises improve equipment management level, and reduce maintenance costs and improve corporate competitiveness.


Surface treatment: first use an angle grinder to clean the scale on the surface of the leaking part, then clean the surface with an electric grinder at the right-angle weld position, carefully clean the surface with sandpaper to expose the original metal color, and then thoroughly clean the surface with absolute ethanol.

Blending materials: Blend 1321 materials in a ratio of 3:1 and stir evenly until there is no color difference.

Applying material: Brush the adjusted 1321 material to protect the weld seam, and then use 1321 material for large area anti-corrosion protection.

Curing time: 24 hours/24°C (material temperature). For every 11°C increase in material temperature, the curing time will be shortened by half, but the elevated temperature must not exceed the withstand temperature of the material.