1. What are the commonly used materials for stainless steel air ducts? How to choose?
Answer: 304 stainless steel: universal type, good corrosion resistance, suitable for ordinary ventilation (such as shopping malls and office buildings). 201 Stainless Steel: Low cost but weak corrosion resistance, only for short-term or low-required projects. Selection basis: environmental corrosiveness (such as chloride ion concentration), temperature (310S is required for high temperature), budget.
2. What are the connection methods for stainless steel air ducts? What are the advantages and disadvantages of each?
Answer: Flange connection: Good sealing (commonly used in high-voltage systems), but complicated installation, stainless steel bolts need to be protected from electrochemical corrosion. Cutting connection: Quick installation (suitable for low-voltage systems), but poor sealing properties, and sealant is required. Welding connection: No leakage (first choice for laboratories and clean rooms), but requires professional argon arc welding technology, which is relatively expensive.
3. What issues should be paid attention to when installing stainless steel air ducts?
Answer: Bracket spacing: ≤3 meters (adjust according to the pipe diameter), avoiding vibration and deformation. Anti-corrosion isolation: It does not come into direct contact with carbon steel, and needs to be isolated with rubber pads or insulating materials. Fire protection requirements: Fire protection valves must be installed when passing through the firewall and coated with refractory materials.
4. How to clean and maintain stainless steel air ducts?
Answer: Cleaning method: Wipe the inner wall with neutral detergent + soft cloth, and use steel wool balls or strong acids and alkalis. Anti-condensation water: The thickness of the insulation layer is ≥25mm (rubber and plastic or glass wool), and repair the damaged areas in time. Regular inspection: Check the corrosion of welds, flange gaskets and brackets at least once a year.
5. What are the advantages of stainless steel air ducts compared with galvanized air ducts?
Answer: Corrosion resistance: Stainless steel has a longer life (especially high humidity and corrosive environment). Sanitary grade: No risk of plating shedding, suitable for the food and pharmaceutical industries. Higher strength: The pressure bearing capacity is better than galvanized air ducts, suitable for high-pressure systems. Disadvantages: High cost (the cost of 304 stainless steel air duct is about 2-3 times that of galvanized air duct).
6. What are the requirements for the welding process of stainless steel air ducts?
Answer: Welding method: Gargo arc welding is preferred to avoid oxidation and impurities. Post-welding treatment: The weld area needs to be pickled and passivated to restore corrosion resistance. Quality inspection standards: Permeability inspection or air pressure test shall be carried out according to GB 50243-2016.
