As the sealing element between plates of plate heat exchanger, gasket can efficiently prevent plate leakage. The quality of gasket directly affect the work efficiency of the equipment, and the materials of the gasket is not the same due to the different usage, below we will understand the characteristics and conditions of use of the common materials of the plate heat exchanger gasket.
The main material of the gasket is rubber, which is influenced by the temperature and the medium, and is therefore easily influenced by the formulation, the homogeneity of the components and the conditions of the vulcanisation process.
The indicator for evaluating the corrosion resistance of the material is the "partial corrosion resistance equivalent PRE". This is mainly determined by the content of Cr, MO and Ni.
(1)304 stainless steel: used in organic and inorganic media, concentration <30% temperature <= 100/concentration >30% temperature <50 nitric acid temperature <100 various concentrations of carbonic acid, ammonia and alcohols. 304L material is basically the same as 304 material, can be welded better and can be used as welded heat exchanger.
(2)316L natural cooling water, cooling tower water, softened water, carbonic acid, acetic acid and caustic soda solution of less than 50% concentration, alcohols and solvents such as acetone, dilute nitric acid (<20%) dilute phosphoric acid (<30%) of temperature less than 100 degrees, but not suitable for sulfuric acid. 316 is basically the same as it.
(3) 317 is suitable for more conditions than 316L.
(4) AISI904L and SUS890L are cost effective and better than all the above materials. Particularly suitable for general sulphuric acid, phosphoric acid and halides.
(5)SMO 254 high-grade stainless steel with increased MO content, a modified super stainless steel for 316. Excellent resistance to chloride and crevice corrosion. Suitable for brine containing, inorganic acids.
(6) SMO654 is a better material than 254 for use in cold seawater.
(7) RS-2 (0Cr20Ni26Mo3Cu3Si2Nb) stainless steel,
