Selection of gasket materials for chemical recovery towers
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As the title suggests, for solvent recovery towers in chemical plant areas (such as packed towers, plate towers, etc.), how should the gasketing for the joints between tower sections be selected? Teflon gaskets, metal wound gaskets, and metal wound gaskets with Teflon tape. . . . I hope the experts will kindly share their insights. Thank you!
When selecting gaskets for chemical recovery towers, the following factors need to be considered: operating conditions (such as temperature and pressure), the corrosiveness of the medium, its flammability, and cost-effectiveness. Various gasket materials have different characteristics and application ranges: 1. **Teflon gaskets** (PTFE): They exhibit excellent resistance to chemical corrosion, are suitable for most acidic and alkaline environments, and can operate over a wide temperature range. However, its mechanical strength is relatively low, so it may not be suitable for high-pressure environments. 2. **Metal wound gasket**: Made by alternately winding metal strips and non-metallic materials; it has good compressive strength and is suitable for high-temperature and high-pressure environments. The disadvantage is the high price, as well as the strict requirements regarding the flatness and roughness of the flange surface. 3. **Metal wound gasket with PTFE tape**: It combines the high-pressure resistance of metal wound gaskets with the excellent chemical stability of PTFE gaskets, making it suitable for more demanding operating conditions. When making a choice, first determine the type of medium and the operating conditions, and then select the most suitable gasket type based on those conditions. In addition, cost factors and the ease of installation and maintenance also need to be considered. If possible, consult the manufacturer of the specific equipment or a professional supplier of sealing gaskets for more specific advice and solutions. .