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Compare the difference between the material and performance of several plate heat exchanger rubber pads_

by:DIGUANG     2021-04-03
Compare the difference in material and performance of pads of several plate heat exchangers

2019-07-11 15:43
778 We all know that the plate heat exchanger gasket is a very important part of the plate heat exchanger. The working temperature of the plate heat exchanger is essentially the temperature that the gasket can withstand, and the working pressure of the plate heat exchanger is also Constrained by gaskets. The plates are very thin and have poor rigidity, and only elastic materials can be used to make sealing gaskets, and they are not high in temperature. The gasket should have a compression that can be certified to seal, and the compression should ensure that the groove is not deformed. The following editor will compare the material and performance of several plate heat exchanger pads, so as to provide reference for users in need. The evaluation of the material and performance of the pads of plate heat exchangers is as follows: The pads of plate heat exchangers have made some progress in temperature and corrosion resistance materials and their performance evaluation. (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. ℃, high temperature EPDM has been increased to 160 ℃; Fluoro-propylene rubber (FPM) can be used at 175 ℃; graphite laminated gaskets can be used at temperatures up to 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. They can be used for highly corrosive media or to increase the temperature limit. HISAKA is the first to use PTFE-coated NBR gaskets, which greatly expands the application fields 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 rubber pad of the plate heat exchanger. For a large logarithmic plate heat exchanger, the plates are generally not damaged, and the gasket is prone to ageing and causing leakage. Therefore, the quality of the gasket determines the quality and service life of the heat exchanger. As a professional plate heat exchanger gasket manufacturer, Diguang Heat Transfer Technology Co., Ltd. can provide users with various brands and models of plate heat exchanger gaskets. Welcome new and old customers to call for consultation!
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