JB/T4719-1992 shell and tube heat exchanger wound gasket This standard specifies the steel shell and tube heat exchanger spiral wound gasket Types, basic parameters and technical requirements of this standard applies to the design temperature is higher than -20 ℃ to 450 ℃, the design pressure is less than 6.4MPa shell and tube heat exchanger tube box gasket spiral wound gasket channel flange and tube plate or flat lid gasket joints floating head gasket floating head heat exchanger floating flanges connection with the floating head tube sheet gasket tube tank side pads floating head heat exchanger, U-tube heat exchanger tube plate and the housing flange of the outer bonnet gasket gasket floating head heat exchanger cranial side of the flange and the outer flange of the outer bonnet gasket bonnet gasket fixed tube sheet heat exchanger tube plate connection with bonnet gasket spacer tube box code names floating head gasket gasket bonnet gasket outer tube box side bonnet gasket metal gasket Code GFCWT standards and code standard code hardness metal materials, HB (max) 0Cr19Ni9 GB4329 1 1870Cr18Ni11Ti GB4329 2 18700Cr19Ni11 GB4329 3 18700Cr17Ni14Mo2 GB4329 4 18708F GB3526 5 90 Other corresponding Standard 6 - Standards and Code of filler filler filler standard code Temperature asbestos Jianbiao 111> -20 ~ 450 PTFE ZB G33 005 2> -20 ~ 260 Flexible graphite ZB J22 019 3> -20 ~ 450 other 4 Press the appropriate standard design or contract requirements header gaskets, floating head gasket and bonnet gasket specifications should be labeled tubes, tubes Specification Code: A-represents the diameter OD * 19 * 2mm wall thickness of the non- seam steel B-representation diameter * thickness 25 * 2.5mm diameter seamless steel tubes tag example DN800mm, PN2.5MPa, 4 tube, diameter 25 * 2.5 tubes, steel is 0Cr19Ni9, asbestos filler tube box Gasket: Spiral wound gaskets G11-800-2.5-4 JB/T4719 gasket should be flat, smooth surface shall not affect the sealing performance radial penetrating wound, indentation and uneven defects.