lanphan rectangular expansion bellow for industrial system

Henan Lanphan XB nonmetal air duct fabric compensator owns excellent sound absorption and noise reduction function, it can remit pipeline error and noise which caused by draught fan vibration, and well compensated pipeline vibration which caused by air duct draught fan, also excellent protective effect on tired-resistance of pipeline. Comparing to metal SS bellows, although the temperature endurance of nonmetal fabric compensator is not very high, its max application temperature is below 1200℃, it has excellent corrosion resistance property. Plus, stainless steel bellows are used in outdoor for a long time, generally it will be corroded by acid rain, thus, SS bellows is easy to rust(except for special material manufacturing), and SS bellows costs more. Compared with SS bellows, air duct fabric compensator costs less, if abrasion badly, just change its cover, which greatly reduced the manufacturing costs, also applicable for reuse.

Henan Lanphan XB nonmetal air duct fabric compensator has round and square style structures, connection methods includes flange type and welding type, it can be used under 1200℃ for a long term, customers can choose different compensator according to their application environment. Insulating layer and thermal-protective layer material mainly consist of PTFE pressed film glass fabric, EPDM coating glass fabric, NBR coating glass fabric, PTFE film and other single layer or multiple layers composite material, besides, except for compensating pipeline, compensator also has abrasive resistance, which can well prevent the friction of hot soot particle and lengthen compensator service life.

We produced the XB air duct fabric compensator according with D-LD2000 standard, and it is widely used for the stack desulfurization, dust-cleaning equipment, air heating, entrance and exit of blast equipments in steelworks, smelting plant, petrochemical plant, thermal power plant, cement plant and atomic energy plant, its property is greatly superior to metal expansion joints, and highly praised by customers.

Basic structure and function

1. Fabric.Fabric is the main flexible material of non-metallic expansion joints, it is compounded by excellent silicone rubber or high silica PTFE and alkali-free glass cotton, and it is a kind of high strength sealing composite material. It has function of absorbing swelling capacity, prevent air leakage and rainwater leakage.
2. Stainless steel wire mesh.Stainless steel wire mesh is the lining of nonmetallic expansion joints, it is used to prevent sundries into expansion joints and prevent thermal insulation material from lost.
3. Heat preservation cotton.Used to ensure heat preservation and gas tightness properties, it is composed of glass fiber cloth, high silica cloth and all kinds of heat insulation cotton felt, its length and width are the same with outer fabric, has excellent extensibility and extension strength.
4. Thermal insulation packing layer.It's the principle security of heat insulation, mainly composed of high temperature resisting material as multiple layers ceramic fiber, whose thickness can be confirmed by heat-transfer calculation.
5. Frame.It's the outline support to ensure enough strength and stiffness, frame material matches with medium temperature. Generally, below 400℃ use Q235-A, above 600℃ use stainless steel or heat-resisting steel.
6. Baffle.Used for stream guidance and thermal-protective coating. Material matches with medium temperature, resistant to corrosion and abrasion. It won't influence displacement of expansion joints.