What kinds of gasket materials are there for plate heat exchangers? how to choose? _
What kinds of gasket materials are there for plate heat exchangers? how to choose?
665 At present, the raw materials commonly used in the production of plate heat exchanger gaskets include nitrile rubber, EPDM rubber, fluoropropylene rubber, graphite laminated gaskets, etc., each of which has its own When choosing the advantages and application fields, users must choose plate heat exchanger gaskets of different materials according to the operating environment and requirements, so as to ensure the operational stability and working status of the plate heat exchanger. Let's take a look at the applicable scope of these plate heat exchanger gaskets in detail to help users make better choices. (1) Nitrile rubber (NBR) is generally suitable for working conditions below 120 ℃. The newly developed high-temperature NBR can reach 145 ℃, and the hydrogenated NBR can reach 160 ℃; EPDM was only used for 150 in the past. ℃, the high temperature EPDM has increased to 160 ℃; Fluoro-propylene rubber (FPM) can be used at 175 ℃; the applicable temperature of graphite laminated gasket can reach 400 ℃, which can well replace compressed asbestos fiber gaskets. (2) Coated gaskets use general rubber or metal blocks as the core, and are coated with polytetrafluoroethylene (PTFE) or fluorinated synthetic materials, etc., which can be used for highly corrosive media or increase the temperature limit. HISAKA is the first to use PTFE-coated NBR gaskets, which greatly expands the application areas of PHE than in the past, and the gaskets have a longer service life. ALFA-LAVAL has used this gasket for double plate welding PHE. (3) With the development of non-adhesive gaskets, the formulation of materials for non-adhesive gaskets must be slightly changed, requiring more stable performance, more durability and better tear resistance. (4) To evaluate the temperature resistance of gaskets, there are two main indicators: compression set and hardness at rated temperature. For new gasket materials, generally the ring sample test and the overall test of the plate and the gasket are required, and the test time is 5-40 days. The recommended use temperature limit of gaskets should be lower than the compression set curve after considering a certain safety factor. The quality and service life of the plate heat exchanger largely depend on the quality and service life of the gasket. For large logarithmic heat exchangers, the plates are generally not damaged, and the gasket is prone to ageing and cause leakage. Therefore, the quality of the gasket determines the quality and service life of the heat exchanger. The plate heat exchanger gasket produced and sold by Diguang Heat Transfer Technology Co., Ltd. can fully ensure the long-term operating life and operational reliability of the plate heat exchanger. The above is an introduction to several common plate heat exchanger rubber pad materials and key points for selection. I hope it will be helpful to you. If you still have any questions about the selection of gaskets for plate heat exchangers, please feel free to contact us, and the technicians of Diguang will answer your questions!